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(-) Description

Title :  CRYSTAL STRUCTURE OF THE HUMAN CD4 N-TERMINAL TWO DOMAIN FRAGMENT COMPLEXED TO A CLASS II MHC MOLECULE
 
Authors :  J. -H. Wang, R. Meijers, E. L. Reinherz
Date :  15 Jul 01  (Deposition) - 19 Sep 01  (Release) - 24 Feb 09  (Revision)
Method :  X-RAY DIFFRACTION
Resolution :  4.30
Chains :  Asym./Biol. Unit :  A,B,C,D
Keywords :  Protein-Protein Complex, Immune System (Keyword Search: [Gene Ontology, PubMed, Web (Google))
 
Reference :  J. H. Wang, R. Meijers, Y. Xiong, J. H. Liu, T. Sakihama, R. Zhang, A. Joachimiak, E. L. Reinherz
Crystal Structure Of The Human Cd4 N-Terminal Two-Domain Fragment Complexed To A Class Ii Mhc Molecule.
Proc. Natl. Acad. Sci. Usa V. 98 10799 2001
PubMed-ID: 11535811  |  Reference-DOI: 10.1073/PNAS.191124098
(for further references see the PDB file header)

(-) Compounds

Molecule 1 - H-2 CLASS II HISTOCOMPATIBILITY ANTIGEN, A-K ALPHA CHAIN
    ChainsA
    EngineeredYES
    Expression SystemCRICETULUS GRISEUS
    Expression System CommonCHINESE HAMSTER
    Expression System Taxid10029
    Organism CommonHOUSE MOUSE
    Organism ScientificMUS MUSCULUS
    Organism Taxid10090
 
Molecule 2 - H-2 CLASS II HISTOCOMPATIBILITY ANTIGEN, A-K BETA CHAIN
    ChainsB
    EngineeredYES
    Expression SystemCRICETULUS GRISEUS
    Expression System CommonCHINESE HAMSTER
    Expression System Taxid10029
    Organism CommonHOUSE MOUSE
    Organism ScientificMUS MUSCULUS
    Organism Taxid10090
 
Molecule 3 - OVOTRANSFERRIN
    ChainsC
    EngineeredYES
    Expression SystemGALLUS GALLUS
    Expression System CommonCHICKEN
    Expression System Taxid9031
    Organism CommonCHICKEN
    Organism ScientificGALLUS GALLUS
    Organism Taxid9031
    SynonymCONALBUMIN
 
Molecule 4 - T-CELL SURFACE GLYCOPROTEIN CD4
    ChainsD
    EngineeredYES
    Expression SystemCRICETULUS GRISEUS
    Expression System CommonCHINESE HAMSTER
    Expression System Taxid10029
    Organism CommonHUMAN
    Organism ScientificHOMO SAPIENS
    Organism Taxid9606
    SynonymT-CELL SURFACE ANTIGEN T4/LEU-3

 Structural Features

(-) Chains, Units

  1234
Asymmetric/Biological Unit ABCD

Summary Information (see also Sequences/Alignments below)

(-) Ligands, Modified Residues, Ions  (0, 0)

(no "Ligand,Modified Residues,Ions" information available for 1JL4)

(-) Sites  (0, 0)

(no "Site" information available for 1JL4)

(-) SS Bonds  (5, 5)

Asymmetric/Biological Unit
No.Residues
1A:107 -A:163
2B:15 -B:79
3B:117 -B:173
4D:16 -D:84
5D:130 -D:159

(-) Cis Peptide Bonds  (3, 3)

Asymmetric/Biological Unit
No.Residues
1Ser A:15 -Pro A:16
2Phe A:113 -Pro A:114
3Tyr B:123 -Pro B:124

 Sequence-Structure Mapping

(-) SAPs(SNPs)/Variants  (2, 2)

Asymmetric/Biological Unit (2, 2)
  dbSNPPDB
No.SourceVariant IDVariantUniProt IDStatusIDChainVariant
1UniProtVAR_TRFE_CHICK_003 *R154WTRFE_CHICK  ---  ---CR135W
2UniProtVAR_023459K191ECD4_HUMANPolymorphism28917504DK166E
   * ID not provided by source

  SNP/SAP Summary Statistics (UniProtKB/Swiss-Prot)

(-) PROSITE Motifs  (1, 2)

Asymmetric/Biological Unit (1, 2)
 PROSITEUniProtKBPDB
No.IDACDescriptionIDLocationCountLocation
1IG_MHCPS00290 Immunoglobulins and major histocompatibility complex proteins signature.HA2K_MOUSE188-194  1A:161-167
HB2K_MOUSE197-203  1B:171-177

(-) Exons   (4, 4)

Asymmetric/Biological Unit (4, 4)
 ENSEMBLUniProtKBPDB
No.Transcript IDExonExon IDGenome LocationLengthIDLocationLengthCountLocationLength
1.1ENST000000116531ENSE00001303311chr12:6898651-6898828178CD4_HUMAN-00--
1.2ENST000000116532ENSE00000866954chr12:6909238-6909353116CD4_HUMAN1-17170--
1.3ENST000000116533ENSE00000716042chr12:6909473-6909637165CD4_HUMAN17-72561D:1-4747
1.4ENST000000116534ENSE00000716044chr12:6923308-6923466159CD4_HUMAN72-125541D:47-10054
1.5ENST000000116535ENSE00000716046chr12:6923925-6924158234CD4_HUMAN125-203791D:100-17879
1.6bENST000000116536bENSE00000716048chr12:6925222-6925569348CD4_HUMAN203-3191171D:178-1781
1.7ENST000000116537ENSE00000716051chr12:6926296-6926496201CD4_HUMAN319-386680--
1.8ENST000000116538ENSE00000716053chr12:6927587-6927708122CD4_HUMAN386-426410--
1.9ENST000000116539ENSE00000716057chr12:6928013-692808068CD4_HUMAN427-449230--
1.10ENST0000001165310ENSE00001182623chr12:6928465-69299761512CD4_HUMAN449-458100--

(-) Sequences/Alignments

Asymmetric/Biological Unit
   Reformat: Number of residues per line =  ('0' or empty: single-line sequence representation)
  Number of residues per labelling interval =   
  UniProt sequence: complete  aligned part    
   Show mapping: SCOP domains CATH domains Pfam domains Secondary structure (by author)
SAPs(SNPs) PROSITE motifs Exons
(details for a mapped element are shown in a popup box when the mouse pointer rests over it)
Chain A from PDB  Type:PROTEIN  Length:178
 aligned with HA2K_MOUSE | P01910 from UniProtKB/Swiss-Prot  Length:256

    Alignment length:178
                                    40        50        60        70        80        90       100       110       120       130       140       150       160       170       180       190       200        
           HA2K_MOUSE    31 HVGSYGITVYQSPGDIGQYTFEFDGDELFYVDLDKKETVWMLPEFAQLRRFEPQGGLQNIATGKHNLEILTKRSNSTPATNEAPQATVFPKSPVLLGQPNTLICFVDNIFPPVINITWLRNSKSVTDGVYETSFFVNRDYSFHKLSYLTFIPSDDDIYDCKVEHWGLEEPVLKHWEPE 208
               SCOP domains d1jl4a2 A:5-81 Class II MHC alpha chain, N-terminal domain                    d1jl4a1 A:82-181 Class II MHC alpha chain, C-terminal domain                                         SCOP domains
               CATH domains ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- CATH domains
               Pfam domains MHC_II_alpha-1jl4A02 A:5-84                                                      --------C1-set-1jl4A01 A:93-175                                                            ------ Pfam domains
         Sec.struct. author .eeeeeeeeeee...eeeeeeee..eeeeeee....eeee.hhhhhhh.eehhhhhhhhhhhhhhhhhhhhhhhh.........eeeeee.........eeeeeeeeee.....eeeeee..ee....eee...ee.....eeeeeeeee.......eeeeee.......eeeee... Sec.struct. author
                 SAPs(SNPs) ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE -------------------------------------------------------------------------------------------------------------------------------------------------------------IG_MHC -------------- PROSITE
                 Transcript ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Transcript
                 1jl4 A   5 HVGSYGITVYQSPGDIGQYTFEFDGDELFYVDLDKKETVWMLPEFAQLRRFEPQGGLQNIATGKHNLEILTKRSNSTPATNEAPQATVFPKSPVLLGQPNTLICFVDNIFPPVINITWLRNSKSVTDGVYETSFFVNRDYSFHKLSYLTFIPSDDDIYDCKVEHWGLEEPVLKHWEPE 181
                                 |  13        23        33        43        53        63        73        83        93       103       113       123       133       143       153       163       173        
                                9A                                                                                                                                                                            

Chain B from PDB  Type:PROTEIN  Length:185
 aligned with HB2K_MOUSE | P06343 from UniProtKB/Swiss-Prot  Length:263

    Alignment length:193
                                    33        43        53        63        73        83        93       103       113       123       133       143       153       163       173       183       193       203       213   
           HB2K_MOUSE    24 GTEGGNSERHFVHQFQPFCYFTNGTQRIRLVIRYIYNREEYVRFDSDVGEYRAVTELGRPDAEYWNKQYLERTRAELDTVCRHNYEKTETPTSLRRLEQPSVVISLSRTEALNHHNTLVCSVTDFYPAKIKVRWFRNGQEETVGVSSTQLIRNGDWTFQVLVMLEMTPRRGEVYTCHVEHPSLKSPITVEWRA 216
               SCOP domains d1        jl4b2 B:5-92 Class II MHC beta chain, N-terminal domain                              d1jl4b1 B:93-190 Class II MHC beta chain, C-terminal domain                                        SCOP domains
               CATH domains ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- CATH domains
               Pfam domains --        -------MHC_II_beta-1jl4B02 B:14-86                                             ----------------C1-set-1jl4B01 B:103-190                                                                 Pfam domains
         Sec.struct. author ..--------eeeeeeeeeeeehhhheeeeeeeeee..eeeeeee.....eee.hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh...hhhhh....eeeeee.........eeeeeeeeee.....eeeeee..eee...eee...ee.....eeeeeeeee......eeeeeee.......eeeeee. Sec.struct. author
                 SAPs(SNPs) ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------IG_MHC ------------- PROSITE
                 Transcript ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Transcript
                 1jl4 B   5 GS--------FVHQFQPFCYFTNGTQRIRLVIRYIYNREEYVRFDSDVGEYRAVTELGRPDAEYWNKQYLERTRAELDTVCRHNYEKTETPTSLRRLEQPSVVISLSRTEALNHHNTLVCSVTDFYPAKIKVRWFRNGQEETVGVSSTQLIRNGDWTFQVLVMLEMTPRRGEVYTCHVEHPSLTSPITVEWRA 190
                             |       -|       16        26        36        46        56       |68        78      | 87        97       107       117       127       137       147       157       167       177       187   
                             6        7                                                       64|               84A                                                                                                          
                                                                                               67                                                                                                                            

Chain C from PDB  Type:PROTEIN  Length:16
 aligned with TRFE_CHICK | P02789 from UniProtKB/Swiss-Prot  Length:705

    Alignment length:27
                                   148       158       
           TRFE_CHICK   139 GRSAGWNIPIGTLLHRGAIEWEGIESG 165
               SCOP domains --------------------------- SCOP domains
               CATH domains --------------------------- CATH domains
               Pfam domains --------------Transferrin-1 Pfam domains
         Sec.struct. author ..e-----------e............ Sec.struct. author
                 SAPs(SNPs) ---------------W----------- SAPs(SNPs)
                    PROSITE --------------------------- PROSITE
                 Transcript --------------------------- Transcript
                 1jl4 C 131 GNS-----------HRGAIEWEGIESG 146
                              |      -    |  139       
                            133         134            

Chain D from PDB  Type:PROTEIN  Length:178
 aligned with CD4_HUMAN | P01730 from UniProtKB/Swiss-Prot  Length:458

    Alignment length:178
                                    35        45        55        65        75        85        95       105       115       125       135       145       155       165       175       185       195        
            CD4_HUMAN    26 KKVVLGKKGDTVELTCTASQKKSIQFHWKNSNQIKILGNQGSFLTKGPSKLNDRADSRRSLWDQGNFPLIIKNLKIEDSDTYICEVEDQKEEVQLLVFGLTANSDTHLLQGQSLTLTLESPPGSSPSVQCRSPRGKNIQGGKTLSVSQLELQDSGTWTCTVLQNQKKVEFKIDIVVLA 203
               SCOP domains d1jl4d1 D:1-97 CD4 V-set domains                                                                 d1jl4d2 D:98-178 CD4 C2-set domains                                               SCOP domains
               CATH domains ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- CATH domains
           Pfam domains (1) ---------------------------------------------------------------------------------------------------C2-set-1jl4D01 D:100-178                                                        Pfam domains (1)
           Pfam domains (2) V-set-1jl4D02 D:1-105                                                                                    ------------------------------------------------------------------------- Pfam domains (2)
         Sec.struct. author .eeeeee....eee...........eeeee....eeeeee..eee.........ee.hhhhhhhh...eee...hhhhheeeeeee..eeeeeeeeeeeeee.....ee....eeeeee.......eee.........ee..eeee...hhhhhee..eeeee..eeeee..ee.ee. Sec.struct. author
                 SAPs(SNPs) ---------------------------------------------------------------------------------------------------------------------------------------------------------------------E------------ SAPs(SNPs)
                    PROSITE ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- PROSITE
           Transcript 1 (1) Exon 1.3  PDB: D:1-47 UniProt: 17-72           ----------------------------------------------------Exon 1.5  PDB: D:100-178 UniProt: 125-203                                       Transcript 1 (1)
           Transcript 1 (2) ----------------------------------------------Exon 1.4  PDB: D:47-100 UniProt: 72-125               -----------------------------------------------------------------------------1 Transcript 1 (2)
                 1jl4 D   1 KKVVLGKKGDTVELTCTASQKKSIQFHWKNSNQIKILGNQGSFLTKGPSKLNDRADSRRSLWDQGNFPLIIKNLKIEDSDTYICEVEDQKEEVQLLVFGLTANSDTHLLQGQSLTLTLESPPGSSPSVQCRSPRGKNIQGGKTLSVSQLELQDSGTWTCTVLQNQKKVEFKIDIVVLA 178
                                    10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170        

   Legend:   → Mismatch (orange background)
  - → Gap (green background, '-', border residues have a numbering label)
    → Modified Residue (blue background, lower-case, 'x' indicates undefined single-letter code, labelled with number + name)
  x → Chemical Group (purple background, 'x', labelled with number + name, e.g. ACE or NH2)
  extra numbering lines below/above indicate numbering irregularities and modified residue names etc., number ends below/above '|'

 Classification and Annotation

(-) SCOP Domains  (6, 6)

Asymmetric/Biological Unit

(-) CATH Domains  (0, 0)

(no "CATH Domain" information available for 1JL4)

(-) Pfam Domains  (6, 7)

Asymmetric/Biological Unit
(-)
Clan: Ig (577)
(-)
Clan: MHC (252)
(-)
Clan: PBP (391)

(-) Gene Ontology  (77, 98)

Asymmetric/Biological Unit(hide GO term definitions)
Chain A   (HA2K_MOUSE | P01910)
molecular function
    GO:0042605    peptide antigen binding    Interacting selectively and non-covalently with an antigen peptide.
    GO:0005515    protein binding    Interacting selectively and non-covalently with any protein or protein complex (a complex of two or more proteins that may include other nonprotein molecules).
biological process
    GO:0019882    antigen processing and presentation    The process in which an antigen-presenting cell expresses antigen (peptide or lipid) on its cell surface in association with an MHC protein complex.
    GO:0019886    antigen processing and presentation of exogenous peptide antigen via MHC class II    The process in which an antigen-presenting cell expresses a peptide antigen of exogenous origin on its cell surface in association with an MHC class II protein complex. The peptide antigen is typically, but not always, processed from a whole protein.
    GO:0048002    antigen processing and presentation of peptide antigen    The process in which an antigen-presenting cell expresses peptide antigen in association with an MHC protein complex on its cell surface, including proteolysis and transport steps for the peptide antigen both prior to and following assembly with the MHC protein complex. The peptide antigen is typically, but not always, processed from an endogenous or exogenous protein.
    GO:0002504    antigen processing and presentation of peptide or polysaccharide antigen via MHC class II    The process in which an antigen-presenting cell expresses antigen (peptide or polysaccharide) on its cell surface in association with an MHC class II protein complex.
    GO:0006955    immune response    Any immune system process that functions in the calibrated response of an organism to a potential internal or invasive threat.
    GO:0002376    immune system process    Any process involved in the development or functioning of the immune system, an organismal system for calibrated responses to potential internal or invasive threats.
    GO:0045582    positive regulation of T cell differentiation    Any process that activates or increases the frequency, rate or extent of T cell differentiation.
cellular component
    GO:0042613    MHC class II protein complex    A transmembrane protein complex composed of an MHC class II alpha and MHC class II beta chain, and with or without a bound peptide or polysaccharide antigen.
    GO:0009897    external side of plasma membrane    The leaflet of the plasma membrane that faces away from the cytoplasm and any proteins embedded or anchored in it or attached to its surface.
    GO:0016021    integral component of membrane    The component of a membrane consisting of the gene products and protein complexes having at least some part of their peptide sequence embedded in the hydrophobic region of the membrane.
    GO:0005764    lysosome    A small lytic vacuole that has cell cycle-independent morphology and is found in most animal cells and that contains a variety of hydrolases, most of which have their maximal activities in the pH range 5-6. The contained enzymes display latency if properly isolated. About 40 different lysosomal hydrolases are known and lysosomes have a great variety of morphologies and functions.
    GO:0016020    membrane    A lipid bilayer along with all the proteins and protein complexes embedded in it an attached to it.
    GO:0005886    plasma membrane    The membrane surrounding a cell that separates the cell from its external environment. It consists of a phospholipid bilayer and associated proteins.

Chain B   (HB2K_MOUSE | P06343)
molecular function
    GO:0042605    peptide antigen binding    Interacting selectively and non-covalently with an antigen peptide.
    GO:0005515    protein binding    Interacting selectively and non-covalently with any protein or protein complex (a complex of two or more proteins that may include other nonprotein molecules).
biological process
    GO:0019882    antigen processing and presentation    The process in which an antigen-presenting cell expresses antigen (peptide or lipid) on its cell surface in association with an MHC protein complex.
    GO:0019886    antigen processing and presentation of exogenous peptide antigen via MHC class II    The process in which an antigen-presenting cell expresses a peptide antigen of exogenous origin on its cell surface in association with an MHC class II protein complex. The peptide antigen is typically, but not always, processed from a whole protein.
    GO:0048002    antigen processing and presentation of peptide antigen    The process in which an antigen-presenting cell expresses peptide antigen in association with an MHC protein complex on its cell surface, including proteolysis and transport steps for the peptide antigen both prior to and following assembly with the MHC protein complex. The peptide antigen is typically, but not always, processed from an endogenous or exogenous protein.
    GO:0002504    antigen processing and presentation of peptide or polysaccharide antigen via MHC class II    The process in which an antigen-presenting cell expresses antigen (peptide or polysaccharide) on its cell surface in association with an MHC class II protein complex.
    GO:0002455    humoral immune response mediated by circulating immunoglobulin    An immune response dependent upon secreted immunoglobulin. An example of this process is found in Mus musculus.
    GO:0006955    immune response    Any immune system process that functions in the calibrated response of an organism to a potential internal or invasive threat.
    GO:0002376    immune system process    Any process involved in the development or functioning of the immune system, an organismal system for calibrated responses to potential internal or invasive threats.
    GO:0002381    immunoglobulin production involved in immunoglobulin mediated immune response    The appearance of immunoglobulin due to biosynthesis or secretion following a cellular stimulus during an immune response, resulting in an increase in its intracellular or extracellular levels.
cellular component
    GO:0005794    Golgi apparatus    A compound membranous cytoplasmic organelle of eukaryotic cells, consisting of flattened, ribosome-free vesicles arranged in a more or less regular stack. The Golgi apparatus differs from the endoplasmic reticulum in often having slightly thicker membranes, appearing in sections as a characteristic shallow semicircle so that the convex side (cis or entry face) abuts the endoplasmic reticulum, secretory vesicles emerging from the concave side (trans or exit face). In vertebrate cells there is usually one such organelle, while in invertebrates and plants, where they are known usually as dictyosomes, there may be several scattered in the cytoplasm. The Golgi apparatus processes proteins produced on the ribosomes of the rough endoplasmic reticulum; such processing includes modification of the core oligosaccharides of glycoproteins, and the sorting and packaging of proteins for transport to a variety of cellular locations. Three different regions of the Golgi are now recognized both in terms of structure and function: cis, in the vicinity of the cis face, trans, in the vicinity of the trans face, and medial, lying between the cis and trans regions.
    GO:0042613    MHC class II protein complex    A transmembrane protein complex composed of an MHC class II alpha and MHC class II beta chain, and with or without a bound peptide or polysaccharide antigen.
    GO:0005769    early endosome    A membrane-bounded organelle that receives incoming material from primary endocytic vesicles that have been generated by clathrin-dependent and clathrin-independent endocytosis; vesicles fuse with the early endosome to deliver cargo for sorting into recycling or degradation pathways.
    GO:0009897    external side of plasma membrane    The leaflet of the plasma membrane that faces away from the cytoplasm and any proteins embedded or anchored in it or attached to its surface.
    GO:0016021    integral component of membrane    The component of a membrane consisting of the gene products and protein complexes having at least some part of their peptide sequence embedded in the hydrophobic region of the membrane.
    GO:0005622    intracellular    The living contents of a cell; the matter contained within (but not including) the plasma membrane, usually taken to exclude large vacuoles and masses of secretory or ingested material. In eukaryotes it includes the nucleus and cytoplasm.
    GO:0016020    membrane    A lipid bilayer along with all the proteins and protein complexes embedded in it an attached to it.
    GO:0005771    multivesicular body    A type of endosome in which regions of the limiting endosomal membrane invaginate to form internal vesicles; membrane proteins that enter the internal vesicles are sequestered from the cytoplasm.
    GO:0005886    plasma membrane    The membrane surrounding a cell that separates the cell from its external environment. It consists of a phospholipid bilayer and associated proteins.

Chain C   (TRFE_CHICK | P02789)
molecular function
    GO:0046872    metal ion binding    Interacting selectively and non-covalently with any metal ion.
biological process
    GO:0006953    acute-phase response    An acute inflammatory response that involves non-antibody proteins whose concentrations in the plasma increase in response to infection or injury of homeothermic animals.
    GO:0006811    ion transport    The directed movement of charged atoms or small charged molecules into, out of or within a cell, or between cells, by means of some agent such as a transporter or pore.
    GO:0055072    iron ion homeostasis    Any process involved in the maintenance of an internal steady state of iron ions within an organism or cell.
    GO:0032496    response to lipopolysaccharide    Any process that results in a change in state or activity of an organism (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of a lipopolysaccharide stimulus; lipopolysaccharide is a major component of the cell wall of gram-negative bacteria.
    GO:0006810    transport    The directed movement of substances (such as macromolecules, small molecules, ions) or cellular components (such as complexes and organelles) into, out of or within a cell, or between cells, or within a multicellular organism by means of some agent such as a transporter, pore or motor protein.
cellular component
    GO:0031012    extracellular matrix    A structure lying external to one or more cells, which provides structural support for cells or tissues.
    GO:0005576    extracellular region    The space external to the outermost structure of a cell. For cells without external protective or external encapsulating structures this refers to space outside of the plasma membrane. This term covers the host cell environment outside an intracellular parasite.
    GO:0005615    extracellular space    That part of a multicellular organism outside the cells proper, usually taken to be outside the plasma membranes, and occupied by fluid.

Chain D   (CD4_HUMAN | P01730)
molecular function
    GO:0042289    MHC class II protein binding    Interacting selectively and non-covalently with major histocompatibility complex class II molecules; a set of molecules displayed on cell surfaces that are responsible for lymphocyte recognition and antigen presentation.
    GO:0015026    coreceptor activity    Combining with an extracellular or intracellular messenger, and in cooperation with a nearby primary receptor, initiating a change in cell activity.
    GO:0019899    enzyme binding    Interacting selectively and non-covalently with any enzyme.
    GO:0005201    extracellular matrix structural constituent    The action of a molecule that contributes to the structural integrity of the extracellular matrix.
    GO:0019865    immunoglobulin binding    Interacting selectively and non-covalently with an immunoglobulin.
    GO:0005515    protein binding    Interacting selectively and non-covalently with any protein or protein complex (a complex of two or more proteins that may include other nonprotein molecules).
    GO:0042803    protein homodimerization activity    Interacting selectively and non-covalently with an identical protein to form a homodimer.
    GO:0019901    protein kinase binding    Interacting selectively and non-covalently with a protein kinase, any enzyme that catalyzes the transfer of a phosphate group, usually from ATP, to a protein substrate.
    GO:1990782    protein tyrosine kinase binding    Interacting selectively and non-covalently with protein tyrosine kinase.
    GO:0004872    receptor activity    Combining with an extracellular or intracellular messenger to initiate a change in cell activity.
    GO:0004888    transmembrane signaling receptor activity    Combining with an extracellular or intracellular signal and transmitting the signal from one side of the membrane to the other to initiate a change in cell activity or state as part of signal transduction.
    GO:0001618    virus receptor activity    Combining with a virus component and mediating entry of the virus into the cell.
    GO:0008270    zinc ion binding    Interacting selectively and non-covalently with zinc (Zn) ions.
biological process
    GO:0042110    T cell activation    The change in morphology and behavior of a mature or immature T cell resulting from exposure to a mitogen, cytokine, chemokine, cellular ligand, or an antigen for which it is specific.
    GO:0031295    T cell costimulation    The process of providing, via surface-bound receptor-ligand pairs, a second, antigen-independent, signal in addition to that provided by the T cell receptor to augment T cell activation.
    GO:0030217    T cell differentiation    The process in which a precursor cell type acquires characteristics of a more mature T-cell. A T cell is a type of lymphocyte whose definin characteristic is the expression of a T cell receptor complex.
    GO:0050852    T cell receptor signaling pathway    A series of molecular signals initiated by the cross-linking of an antigen receptor on a T cell.
    GO:0045058    T cell selection    The process in which T cells that express T cell receptors that are restricted by self MHC protein complexes and tolerant to self antigens are selected for further maturation.
    GO:0002250    adaptive immune response    An immune response mediated by cells expressing specific receptors for antigen produced through a somatic diversification process, and allowing for an enhanced secondary response to subsequent exposures to the same antigen (immunological memory).
    GO:0007155    cell adhesion    The attachment of a cell, either to another cell or to an underlying substrate such as the extracellular matrix, via cell adhesion molecules.
    GO:0007166    cell surface receptor signaling pathway    A series of molecular signals initiated by activation of a receptor on the surface of a cell. The pathway begins with binding of an extracellular ligand to a cell surface receptor, or for receptors that signal in the absence of a ligand, by ligand-withdrawal or the activity of a constitutively active receptor. The pathway ends with regulation of a downstream cellular process, e.g. transcription.
    GO:0001816    cytokine production    The appearance of a cytokine due to biosynthesis or secretion following a cellular stimulus, resulting in an increase in its intracellular or extracellular levels.
    GO:0050829    defense response to Gram-negative bacterium    Reactions triggered in response to the presence of a Gram-negative bacterium that act to protect the cell or organism.
    GO:0030260    entry into host cell    The invasion by an organism of a cell of its host organism. The host is defined as the larger of the organisms involved in a symbiotic interaction.
    GO:0007167    enzyme linked receptor protein signaling pathway    Any series of molecular signals initiated by the binding of an extracellular ligand to a receptor on the surface of the target cell, where the receptor possesses catalytic activity or is closely associated with an enzyme such as a protein kinase, and ending with regulation of a downstream cellular process, e.g. transcription.
    GO:0019064    fusion of virus membrane with host plasma membrane    Fusion of a viral membrane with the host cell membrane during viral entry. Results in release of the virion contents into the cytoplasm.
    GO:0035397    helper T cell enhancement of adaptive immune response    Positive regulation of an adaptive immune response mediated via cytokine production by helper T cell.
    GO:0006955    immune response    Any immune system process that functions in the calibrated response of an organism to a potential internal or invasive threat.
    GO:0002376    immune system process    Any process involved in the development or functioning of the immune system, an organismal system for calibrated responses to potential internal or invasive threats.
    GO:0006948    induction by virus of host cell-cell fusion    The process of syncytia-forming cell-cell fusion, caused by a virus.
    GO:0032507    maintenance of protein location in cell    Any process in which a protein is maintained in a specific location within, or in the membrane of, a cell, and is prevented from moving elsewhere.
    GO:0050870    positive regulation of T cell activation    Any process that activates or increases the frequency, rate or extent of T cell activation.
    GO:0042102    positive regulation of T cell proliferation    Any process that activates or increases the rate or extent of T cell proliferation.
    GO:0010524    positive regulation of calcium ion transport into cytosol    Any process that increases the rate of the directed movement of calcium ions into the cytosol of a cell. The cytosol is that part of the cytoplasm that does not contain membranous or particulate subcellular components.
    GO:0050850    positive regulation of calcium-mediated signaling    Any process that activates or increases the frequency, rate or extent of calcium-mediated signaling.
    GO:0045086    positive regulation of interleukin-2 biosynthetic process    Any process that activates or increases the frequency, rate or extent of the chemical reactions and pathways resulting in the formation of interleukin-2.
    GO:0050731    positive regulation of peptidyl-tyrosine phosphorylation    Any process that activates or increases the frequency, rate or extent of the phosphorylation of peptidyl-tyrosine.
    GO:0045860    positive regulation of protein kinase activity    Any process that activates or increases the frequency, rate or extent of protein kinase activity.
    GO:0050863    regulation of T cell activation    Any process that modulates the frequency, rate or extent of T cell activation.
    GO:0050690    regulation of defense response to virus by virus    Any viral process that modulates the frequency, rate, or extent of the antiviral response of the host cell or organism.
    GO:0032355    response to estradiol    Any process that results in a change in state or activity of a cell or an organism (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of stimulus by estradiol, a C18 steroid hormone hydroxylated at C3 and C17 that acts as a potent estrogen.
    GO:0033280    response to vitamin D    Any process that results in a change in state or activity of a cell or an organism (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of a vitamin D stimulus.
    GO:0007165    signal transduction    The cellular process in which a signal is conveyed to trigger a change in the activity or state of a cell. Signal transduction begins with reception of a signal (e.g. a ligand binding to a receptor or receptor activation by a stimulus such as light), or for signal transduction in the absence of ligand, signal-withdrawal or the activity of a constitutively active receptor. Signal transduction ends with regulation of a downstream cellular process, e.g. regulation of transcription or regulation of a metabolic process. Signal transduction covers signaling from receptors located on the surface of the cell and signaling via molecules located within the cell. For signaling between cells, signal transduction is restricted to events at and within the receiving cell.
    GO:0007169    transmembrane receptor protein tyrosine kinase signaling pathway    A series of molecular signals initiated by the binding of an extracellular ligand to a receptor on the surface of the target cell where the receptor possesses tyrosine kinase activity, and ending with regulation of a downstream cellular process, e.g. transcription.
    GO:0016032    viral process    A multi-organism process in which a virus is a participant. The other participant is the host. Includes infection of a host cell, replication of the viral genome, and assembly of progeny virus particles. In some cases the viral genetic material may integrate into the host genome and only subsequently, under particular circumstances, 'complete' its life cycle.
cellular component
    GO:0042101    T cell receptor complex    A protein complex that contains a disulfide-linked heterodimer of T cell receptor (TCR) chains, which are members of the immunoglobulin superfamily, and mediates antigen recognition, ultimately resulting in T cell activation. The TCR heterodimer is associated with the CD3 complex, which consists of the nonpolymorphic polypeptides gamma, delta, epsilon, zeta, and, in some cases, eta (an RNA splice variant of zeta) or Fc epsilon chains.
    GO:0009986    cell surface    The external part of the cell wall and/or plasma membrane.
    GO:0005769    early endosome    A membrane-bounded organelle that receives incoming material from primary endocytic vesicles that have been generated by clathrin-dependent and clathrin-independent endocytosis; vesicles fuse with the early endosome to deliver cargo for sorting into recycling or degradation pathways.
    GO:0005788    endoplasmic reticulum lumen    The volume enclosed by the membranes of the endoplasmic reticulum.
    GO:0005789    endoplasmic reticulum membrane    The lipid bilayer surrounding the endoplasmic reticulum.
    GO:0009897    external side of plasma membrane    The leaflet of the plasma membrane that faces away from the cytoplasm and any proteins embedded or anchored in it or attached to its surface.
    GO:0016021    integral component of membrane    The component of a membrane consisting of the gene products and protein complexes having at least some part of their peptide sequence embedded in the hydrophobic region of the membrane.
    GO:0016020    membrane    A lipid bilayer along with all the proteins and protein complexes embedded in it an attached to it.
    GO:0045121    membrane raft    Any of the small (10-200 nm), heterogeneous, highly dynamic, sterol- and sphingolipid-enriched membrane domains that compartmentalize cellular processes. Small rafts can sometimes be stabilized to form larger platforms through protein-protein and protein-lipid interactions.
    GO:0005886    plasma membrane    The membrane surrounding a cell that separates the cell from its external environment. It consists of a phospholipid bilayer and associated proteins.

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 Related Entries

(-) Entries Sharing at Least One Protein Chain (UniProt ID)

UniProtKB/Swiss-Prot
        CD4_HUMAN | P017301cdh 1cdi 1cdj 1cdu 1cdy 1g9m 1g9n 1gc1 1opn 1opt 1opw 1q68 1rzj 1rzk 1wbr 1wio 1wip 1wiq 2b4c 2jkr 2jkt 2klu 2nxy 2nxz 2ny0 2ny1 2ny2 2ny3 2ny4 2ny5 2ny6 2qad 3b71 3cd4 3j70 3jcb 3jcc 3jwd 3jwo 3lqa 3o2d 3s4s 3s5l 3t0e 4h8w 4jm2 4p9h 4q6i 4r2g 4r4h 4rqs 5a7x 5a8h 5cay 5thr 5u1f 5vn3
        HA2K_MOUSE | P019101d9k 1iak
        HB2K_MOUSE | P063431d9k 1iak
        TRFE_CHICK | P027891aiv 1d9k 1iej 1iq7 1n04 1nft 1nnt 1ovt 1ryx 1tfa 2d3i

(-) Related Entries Specified in the PDB File

1g9m HIV GP120 GLYCOPROTEIN COMPLEXED WITH HUMAN CD4 FRAGMENT (DOMAIN I AND II)
1iak MURINE CLASS II MHC MOLECULE
1wio HUMAN CD4 FRAGMENT (DOMAIN I TO IV)
3cd4 HUMAN CD4 FRAGMENT (DOMAIN I AND II)