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(-) Description

Title :  CRYSTAL STRUCTURE OF HLA-DR4 COMPLEX WITH PEPTIDOMIMETIC AND SEB
 
Authors :  A. Swain, R. Crowther, U. Kammlott
Date :  13 Oct 99  (Deposition) - 28 Jun 00  (Release) - 13 Jul 11  (Revision)
Method :  X-RAY DIFFRACTION
Resolution :  2.45
Chains :  Asym./Biol. Unit :  A,B,C,D
Keywords :  Mhc Class Ii-Superantigen Complex, Immune System-Peptide Inhibitor Complex, Peptidomimetic Inhibitor (Keyword Search: [Gene Ontology, PubMed, Web (Google))
 
Reference :  D. R. Bolin, A. L. Swain, R. Sarabu, S. J. Berthel, P. Gillespie, N. J. Huby, R. Makofske, L. Orzechowski, A. Perrotta, K. Toth, J. P. Cooper, N. Jiang, F. Falcioni, R. Campbell, D. Cox, D. Gaizband, C. J. Belunis, D. Vidovic, K. Ito, R. Crowther, U. Kammlott, X. Zhang, R. Palermo, D. Weber, J. Guenot, Z. Nagy, G. L. Olson
Peptide And Peptide Mimetic Inhibitors Of Antigen Presentation By Hla-Dr Class Ii Mhc Molecules. Design, Structure-Activity Relationships, And X-Ray Crystal Structures.
J. Med. Chem. V. 43 2135 2000
PubMed-ID: 10841792  |  Reference-DOI: 10.1021/JM000034H

(-) Compounds

Molecule 1 - HLA CLASS II HISTOCOMPATIBILITY ANTIGEN
    ChainsA
    EngineeredYES
    Expression SystemDROSOPHILA MELANOGASTER
    Expression System CommonFRUIT FLY
    Expression System Taxid7227
    FragmentDR ALPHA CHAIN, EXTRACELLULAR DOMAIN
    Organism CommonHUMAN
    Organism ScientificHOMO SAPIENS
    Organism Taxid9606
    SynonymHLA-DR4
 
Molecule 2 - HLA CLASS II HISTOCOMPATIBILITY ANTIGEN
    ChainsB
    EngineeredYES
    Expression SystemDROSOPHILA MELANOGASTER
    Expression System CommonFRUIT FLY
    Expression System Taxid7227
    FragmentDR-4 BETA CHAIN, EXTRACELLULAR DOMAIN
    Organism CommonHUMAN
    Organism ScientificHOMO SAPIENS
    Organism Taxid9606
    SynonymHLA-DR4
 
Molecule 3 - ENTEROTOXIN TYPE B
    ChainsC
    Organism ScientificSTAPHYLOCOCCUS AUREUS
    Organism Taxid1280
    SynonymSEB, SUPERANTIGEN
 
Molecule 4 - PEPTIDOMIMETIC INHIBITOR
    ChainsD
    EngineeredYES
    Other DetailsTHE PEPTIDE WAS CHEMICALLY SYNTHESIZED.
    SyntheticYES

 Structural Features

(-) Chains, Units

  1234
Asymmetric/Biological Unit ABCD

Summary Information (see also Sequences/Alignments below)

(-) Ligands, Modified Residues, Ions  (5, 5)

Asymmetric/Biological Unit (5, 5)
No.NameCountTypeFull Name
1ACE1Mod. Amino AcidACETYL GROUP
2ALC1Mod. Amino Acid2-AMINO-3-CYCLOHEXYL-PROPIONIC ACID
3MPQ1Mod. Amino AcidN-METHYL-ALPHA-PHENYL-GLYCINE
4NH21Mod. Amino AcidAMINO GROUP
5TBG1Mod. Amino Acid3-METHYL-L-VALINE

(-) Sites  (1, 1)

Asymmetric Unit (1, 1)
No.NameEvidenceResiduesDescription
1AC1SOFTWAREGLN A:9 , GLU A:11 , PHE A:22 , SER A:53 , PHE A:54 , GLY A:58 , ALA A:59 , ASN A:62 , VAL A:65 , ASP A:66 , ASN A:69 , GLU A:179 , HIS B:13 , TYR B:30 , LYS B:71 , ALA B:74 , THR B:77 , TYR B:78 , HIS B:81 , ASN B:82 , VAL B:85BINDING SITE FOR CHAIN D OF PROTEIN (PEPTIDOMIMETIC INHIBITOR)

(-) SS Bonds  (4, 4)

Asymmetric/Biological Unit
No.Residues
1A:107 -A:163
2B:15 -B:79
3B:117 -B:173
4C:93 -C:113

(-) Cis Peptide Bonds  (3, 3)

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

 Sequence-Structure Mapping

(-) SAPs(SNPs)/Variants  (7, 7)

Asymmetric/Biological Unit (7, 7)
  dbSNPPDB
No.SourceVariant IDVariantUniProt IDStatusIDChainVariant
1UniProtVAR_016673D86S2B14_HUMANPolymorphism  ---BD57S
2UniProtVAR_016674L96I2B14_HUMANPolymorphism  ---BL67I
3UniProtVAR_016675Q99D2B14_HUMANPolymorphism  ---BQ70D
4UniProtVAR_016676K100E2B14_HUMANPolymorphism  ---BK71E
5UniProtVAR_016677K100R2B14_HUMANPolymorphism  ---BK71R
6UniProtVAR_016678A103E2B14_HUMANPolymorphism  ---BA74E
7UniProtVAR_016679G115V2B14_HUMANPolymorphism  ---BG86V

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

(-) PROSITE Motifs  (3, 4)

Asymmetric/Biological Unit (3, 4)
 PROSITEUniProtKBPDB
No.IDACDescriptionIDLocationCountLocation
1STAPH_STREP_TOXIN_1PS00277 Staphylococcal enterotoxin/Streptococcal pyrogenic exotoxin signature 1.ETXB_STAAU142-151  1C:115-124
2STAPH_STREP_TOXIN_2PS00278 Staphyloccocal enterotoxin/Streptococcal pyrogenic exotoxin signature 2.ETXB_STAAU179-202  1C:152-175
3IG_MHCPS00290 Immunoglobulins and major histocompatibility complex proteins signature.DRA_HUMAN186-192  1A:161-167
2B14_HUMAN200-206  1B:171-177

(-) Exons   (3, 3)

Asymmetric/Biological Unit (3, 3)
 ENSEMBLUniProtKBPDB
No.Transcript IDExonExon IDGenome LocationLengthIDLocationLengthCountLocationLength
1.6aENST000003832596aENSE00001839042HSCHR6_MHC_QBL:32365090-32365280191DRA_HUMAN1-28280--
1.7bENST000003832597bENSE00001719010HSCHR6_MHC_QBL:32367694-32367939246DRA_HUMAN28-110831A:4-8582
1.8cENST000003832598cENSE00001737588HSCHR6_MHC_QBL:32368431-32368712282DRA_HUMAN110-204951A:85-17995
1.9aENST000003832599aENSE00001770912HSCHR6_MHC_QBL:32369002-32369167166DRA_HUMAN204-254511A:179-1802
1.10bENST0000038325910bENSE00001925700HSCHR6_MHC_QBL:32369906-32370300395DRA_HUMAN-00--

(-) 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:177
 aligned with DRA_HUMAN | P01903 from UniProtKB/Swiss-Prot  Length:254

    Alignment length:177
                                    38        48        58        68        78        88        98       108       118       128       138       148       158       168       178       188       198       
            DRA_HUMAN    29 EHVIIQAEFYLNPDQSGEFMFDFDGDEIFHVDMAKKETVWRLEEFGRFASFEAQGALANIAVDKANLEIMTKRSNYTPITNVPPEVTVLTNSPVELREPNVLICFIDKFTPPVVNVTWLRNGKPVTTGVSETVFLPREDHLFRKFHYLPFLPSTEDVYDCRVEHWGLDEPLLKHWEF 205
               SCOP domains d1d6ea2 A:4-81 Class II MHC alpha chain, N-terminal domain                    d1d6ea1 A:82-180 Class II MHC alpha chain, C-terminal domain                                        SCOP domains
               CATH domains 1d6eA01 A:4-81                                                                1d6eA02 A:82-180 Immunoglobulins                                                                    CATH domains
               Pfam domains --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author .eeeeeeeeeee...eeeeeeee..eeeeeee....eeee.hhhhhhh....hhhhhhhhhhhhhhhhhhhhhh..........eeeeee.........eeeeeeeeee.....eeeeee..eee....ee...ee.....eeeeeeeee......eeeeeee.......eeeeee. Sec.struct. author
                 SAPs(SNPs) --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                PROSITE (2) -------------------------------------------------------------------------------------------------------------------------------------------------------------IG_MHC ------------- PROSITE (2)
           Transcript 1 (1) Exon 1.7b  PDB: A:4-85 UniProt: 28-110 [INCOMPLETE]                               ---------------------------------------------------------------------------------------------1. Transcript 1 (1)
           Transcript 1 (2) ---------------------------------------------------------------------------------Exon 1.8c  PDB: A:85-179 UniProt: 110-204                                                      - Transcript 1 (2)
                 1d6e A   4 EHVIIQAEFYLNPDQSGEFMFDFDGDEIFHVDMAKKETVWRLEEFGRFASFEAQGALANIAVDKANLEIMTKRSNYTPITNVPPEVTVLTNSPVELREPNVLICFIDKFTPPVVNVTWLRNGKPVTTGVSETVFLPREDHLFRKFHYLPFLPSTEDVYDCRVEHWGLDEPLLKHWEF 180
                                    13        23        33        43        53        63        73        83        93       103       113       123       133       143       153       163       173       

Chain B from PDB  Type:PROTEIN  Length:179
 aligned with 2B14_HUMAN | P13760 from UniProtKB/Swiss-Prot  Length:266

    Alignment length:188
                                    41        51        61        71        81        91       101       111       121       131       141       151       161       171       181       191       201       211        
           2B14_HUMAN    32 TRPRFLEQVKHECHFFNGTERVRFLDRYFYHQEEYVRFDSDVGEYRAVTELGRPDAEYWNSQKDLLEQKRAAVDTYCRHNYGVGESFTVQRRVYPEVTVYPAKTQPLQHHNLLVCSVNGFYPGSIEVRWFRNGQEEKTGVVSTGLIQNGDWTFQTLVMLETVPRSGEVYTCQVEHPSLTSPLTVEWRA 219
               SCOP domains d1d6eb2 B:3-92 Class II MHC beta chain, N-terminal domain                                 d1d6eb1 B:93         -190 Class II MHC beta chain, C-terminal domain                               SCOP domains
               CATH domains 1d6eB01 B:3-91 Class II Histocompatibility Antigen, M Beta Chain; Chain B, domain 1      1d6eB02 B:92-         190 Immunoglobulins                                                           CATH domains
               Pfam domains -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author ....eeeeeeeeeeee....eeeeeeeeee..eeeeeee.....eee.hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh.......eeeeee.---------.eeeeeeee.....eeeeee..ee....eee...ee.....eeeeeee........eeeeeee.......eeeeee. Sec.struct. author
             SAPs(SNPs) (1) ------------------------------------------------------S---------I--DE--E-----------V-------------------------------------------------------------------------------------------------------- SAPs(SNPs) (1)
             SAPs(SNPs) (2) --------------------------------------------------------------------R----------------------------------------------------------------------------------------------------------------------- SAPs(SNPs) (2)
                PROSITE (2) ------------------------------------------------------------------------------------------------------------------------------------------------------------------------IG_MHC ------------- PROSITE (2)
                 Transcript -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Transcript
                 1d6e B   3 TRPRFLEQVKHECHFFNGTERVRFLDRYFYHQEEYVRFDSDVGEYRAVTELGRPDAEYWNSQKDLLEQKRAAVDTYCRHNYGVGESFTVQRRVYPEVTVYPA---------LLVCSVNGFYPGSIEVRWFRNGQEEKTGVVSTGLIQNGDWTFQTLVMLETVPRSGEVYTCQVEHPSLTSPLTVEWRA 190
                                    12        22        32        42        52        62        72        82        92       102 |       - |     122       132       142       152       162       172       182        
                                                                                                                               104       114                                                                            

Chain C from PDB  Type:PROTEIN  Length:225
 aligned with ETXB_STAAU | P01552 from UniProtKB/Swiss-Prot  Length:266

    Alignment length:236
                                    38        48        58        68        78        88        98       108       118       128       138       148       158       168       178       188       198       208       218       228       238       248       258      
           ETXB_STAAU    29 SQPDPKPDELHKSSKFTGLMENMKVLYDDNHVSAINVKSIDQFLYFDLIYSIKDTKLGNYDNVRVEFKNKDLADKYKDKYVDVFGANYYYQCYFSKKTNDINSHQTDKRKTCMYGGVTEHNGNQLDKYRSITVRVFEDGKNLLSFDVQTNKKKVTAQELDYLTRHYLVKNKKLYEFNNSPYETGYIKFIENENSFWYDMMPAPGDKFDQSKYLMMYNDNKMVDSKDVKIEVYLTTK 264
               SCOP domains d1d6ec1 C:2-121 Staphylococcal enterotoxin B, SEB                                                                       d1d6ec2 C:122-237 Staphylococcal enterotoxin B, SEB                                                                  SCOP domains
               CATH domains 1d6eC02 C:2-31,C:128-231      1d6eC01 C:32-121  [code=2.40.50.110, no name defined]                                     ------1d6eC02 C:2-31,C:128-231  [code=3.10.20.120, no name defined]                                           ------ CATH domains
               Pfam domains -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author ...........hhhh....hhhhhhhhh...eeeeee.........eeee...........eeeee..hhhhhhhhh...eeeee............-----------.eeeee..eee....eeeeeeeeeeeeee..eeeeeeeeeeee.eeehhhhhhhhhhhhhhhhh........eeeeeeeee....eeeee.........hhhhhhhhhh...eee....eeeeeeee. Sec.struct. author
                 SAPs(SNPs) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE -----------------------------------------------------------------------------------------------------------------STAPH_STRE---------------------------STAPH_STREP_TOXIN_2     -------------------------------------------------------------- PROSITE
                 Transcript -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Transcript
                 1d6e C   2 SQPDPKPDELHKSSKFTGLMENMKVLYDDNHVSAINVKSIDQFLYFDLIYSIKDTKLGNYDNVRVEFKNKDLADKYKDKYVDVFGANYYYQCYFSKK-----------RKTCMYGGVTEHNGNQLDKYRSITVRVFEDGKNLLSFDVQTNKKKVTAQELDYLTRHYLVKNKKLYEFNNSPYETGYIKFIENENSFWYDMMPAPGDKFDQSKYLMMYNDNKMVDSKDVKIEVYLTTK 237
                                    11        21        31        41        51        61        71        81        91      |  -       111       121       131       141       151       161       171       181       191       201       211       221       231      
                                                                                                                           98         110                                                                                                                               

Chain D from PDB  Type:PROTEIN  Length:9
                                         
               SCOP domains --------- SCOP domains
               CATH domains --------- CATH domains
               Pfam domains --------- Pfam domains
         Sec.struct. author ......... Sec.struct. author
                 SAPs(SNPs) --------- SAPs(SNPs)
                    PROSITE --------- PROSITE
                 Transcript --------- Transcript
                 1d6e D   1 xaRgMASgx   9
                            || |   ||
                            1-ACE  ||
                             2-ALC ||
                               4-MPQ|
                                   8-TBG
                                    9-NH2

   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  (4, 6)

Asymmetric/Biological Unit
(-)
Class: Alpha Beta (26913)
(-)
Class: Mainly Beta (13760)

(-) Pfam Domains  (0, 0)

(no "Pfam Domain" information available for 1D6E)

(-) Gene Ontology  (54, 85)

Asymmetric/Biological Unit(hide GO term definitions)
Chain A   (DRA_HUMAN | P01903)
molecular function
    GO:0023026    MHC class II protein complex binding    Interacting selectively and non-covalently with the class II major histocompatibility complex.
    GO:0032395    MHC class II receptor activity    Combining with an MHC class II protein complex and transmitting the signal from one side of the membrane to the other to initiate a change in cell activity.
    GO:0042605    peptide antigen binding    Interacting selectively and non-covalently with an antigen peptide.
biological process
    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: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: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: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:0050890    cognition    The operation of the mind by which an organism becomes aware of objects of thought or perception; it includes the mental activities associated with thinking, learning, and memory.
    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:0060333    interferon-gamma-mediated signaling pathway    A series of molecular signals initiated by the binding of interferon-gamma to a receptor on the surface of a cell, and ending with regulation of a downstream cellular process, e.g. transcription. Interferon gamma is the only member of the type II interferon found so far.
    GO:0002503    peptide antigen assembly with MHC class II protein complex    The binding of a peptide to the antigen binding groove of an MHC class II protein complex.
    GO:0002506    polysaccharide assembly with MHC class II protein complex    The binding of a polysaccharide to the antigen binding groove of an MHC class II protein complex.
    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:0012507    ER to Golgi transport vesicle membrane    The lipid bilayer surrounding a vesicle transporting substances from the endoplasmic reticulum to the Golgi.
    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:0000139    Golgi membrane    The lipid bilayer surrounding any of the compartments of the Golgi apparatus.
    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:0009986    cell surface    The external part of the cell wall and/or plasma membrane.
    GO:0030669    clathrin-coated endocytic vesicle membrane    The lipid bilayer surrounding a clathrin-coated endocytic vesicle.
    GO:0030666    endocytic vesicle membrane    The lipid bilayer surrounding an endocytic vesicle.
    GO:0005783    endoplasmic reticulum    The irregular network of unit membranes, visible only by electron microscopy, that occurs in the cytoplasm of many eukaryotic cells. The membranes form a complex meshwork of tubular channels, which are often expanded into slitlike cavities called cisternae. The ER takes two forms, rough (or granular), with ribosomes adhering to the outer surface, and smooth (with no ribosomes attached).
    GO:0005789    endoplasmic reticulum membrane    The lipid bilayer surrounding the endoplasmic reticulum.
    GO:0005768    endosome    A vacuole to which materials ingested by endocytosis are delivered.
    GO:0010008    endosome membrane    The lipid bilayer surrounding an endosome.
    GO:0070062    extracellular exosome    A vesicle that is released into the extracellular region by fusion of the limiting endosomal membrane of a multivesicular body with the plasma membrane. Extracellular exosomes, also simply called exosomes, have a diameter of about 40-100 nm.
    GO:0071556    integral component of lumenal side of endoplasmic reticulum membrane    The component of the endoplasmic reticulum membrane consisting of the gene products that penetrate only the lumenal side of the membrane.
    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:0005887    integral component of plasma membrane    The component of the plasma 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:0031902    late endosome membrane    The lipid bilayer surrounding a late endosome.
    GO:0005765    lysosomal membrane    The lipid bilayer surrounding the lysosome and separating its contents from the cell cytoplasm.
    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.
    GO:0032588    trans-Golgi network membrane    The lipid bilayer surrounding any of the compartments that make up the trans-Golgi network.
    GO:0030658    transport vesicle membrane    The lipid bilayer surrounding a transport vesicle.

Chain B   (2B14_HUMAN | P13760)
molecular function
    GO:0032395    MHC class II receptor activity    Combining with an MHC class II protein complex and transmitting the signal from one side of the membrane to the other to initiate a change in cell activity.
    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: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: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:0042088    T-helper 1 type immune response    An immune response which is associated with resistance to intracellular bacteria, fungi, and protozoa, and pathological conditions such as arthritis, and which is typically orchestrated by the production of particular cytokines by T-helper 1 cells, most notably interferon-gamma, IL-2, and lymphotoxin.
    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: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:0016045    detection of bacterium    The series of events in which a stimulus from a bacterium is received and converted into a molecular signal.
    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.
    GO:0002437    inflammatory response to antigenic stimulus    An inflammatory response to an antigenic stimulus, which can be include any number of T cell or B cell epitopes.
    GO:0060333    interferon-gamma-mediated signaling pathway    A series of molecular signals initiated by the binding of interferon-gamma to a receptor on the surface of a cell, and ending with regulation of a downstream cellular process, e.g. transcription. Interferon gamma is the only member of the type II interferon found so far.
    GO:0042130    negative regulation of T cell proliferation    Any process that stops, prevents or reduces the rate or extent of T cell proliferation.
    GO:0002862    negative regulation of inflammatory response to antigenic stimulus    Any process that stops, prevents, or reduces the frequency, rate, or extent of an inflammatory response to an antigenic stimulus.
    GO:0032689    negative regulation of interferon-gamma production    Any process that stops, prevents, or reduces the frequency, rate, or extent of interferon-gamma production. Interferon-gamma is also known as type II interferon.
    GO:0002503    peptide antigen assembly with MHC class II protein complex    The binding of a peptide to the antigen binding groove of an MHC class II protein complex.
    GO:0035774    positive regulation of insulin secretion involved in cellular response to glucose stimulus    Any process that increases the frequency, rate or extent of the regulated release of insulin that contributes to the response of a cell to glucose.
    GO:0051262    protein tetramerization    The formation of a protein tetramer, a macromolecular structure consisting of four noncovalently associated identical or nonidentical subunits.
    GO:2001179    regulation of interleukin-10 secretion    Any process that modulates the frequency, rate or extent of interleukin-10 secretion.
    GO:0032673    regulation of interleukin-4 production    Any process that modulates the frequency, rate, or extent of interleukin-4 production.
    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.
cellular component
    GO:0012507    ER to Golgi transport vesicle membrane    The lipid bilayer surrounding a vesicle transporting substances from the endoplasmic reticulum to the Golgi.
    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:0000139    Golgi membrane    The lipid bilayer surrounding any of the compartments of the Golgi apparatus.
    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:0030669    clathrin-coated endocytic vesicle membrane    The lipid bilayer surrounding a clathrin-coated endocytic vesicle.
    GO:0030666    endocytic vesicle membrane    The lipid bilayer surrounding an endocytic vesicle.
    GO:0005783    endoplasmic reticulum    The irregular network of unit membranes, visible only by electron microscopy, that occurs in the cytoplasm of many eukaryotic cells. The membranes form a complex meshwork of tubular channels, which are often expanded into slitlike cavities called cisternae. The ER takes two forms, rough (or granular), with ribosomes adhering to the outer surface, and smooth (with no ribosomes attached).
    GO:0005789    endoplasmic reticulum membrane    The lipid bilayer surrounding the endoplasmic reticulum.
    GO:0005768    endosome    A vacuole to which materials ingested by endocytosis are delivered.
    GO:0010008    endosome membrane    The lipid bilayer surrounding an endosome.
    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:0071556    integral component of lumenal side of endoplasmic reticulum membrane    The component of the endoplasmic reticulum membrane consisting of the gene products that penetrate only the lumenal side of the membrane.
    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:0005887    integral component of plasma membrane    The component of the plasma 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:0031902    late endosome membrane    The lipid bilayer surrounding a late endosome.
    GO:0005765    lysosomal membrane    The lipid bilayer surrounding the lysosome and separating its contents from the cell cytoplasm.
    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.
    GO:0032588    trans-Golgi network membrane    The lipid bilayer surrounding any of the compartments that make up the trans-Golgi network.
    GO:0030658    transport vesicle membrane    The lipid bilayer surrounding a transport vesicle.

Chain C   (ETXB_STAAU | P01552)
biological process
    GO:0009405    pathogenesis    The set of specific processes that generate the ability of an organism to induce an abnormal, generally detrimental state in another organism.
cellular component
    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.

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 Related Entries

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

UniProtKB/Swiss-Prot
        2B14_HUMAN | P137601d5m 1d5x 1d5z 1j8h 2seb 3o6f 3t0e 4is6 4mcy 4mcz 4md0 4md4 4md5 4mdi 4mdj 4y19 4y1a 5jlz 5lax
        DRA_HUMAN | P019031a6a 1aqd 1bx2 1d5m 1d5x 1d5z 1dlh 1fv1 1fyt 1h15 1hqr 1hxy 1j8h 1jwm 1jws 1jwu 1kg0 1klg 1klu 1lo5 1pyw 1r5i 1seb 1sje 1sjh 1t5w 1t5x 1ymm 1zgl 2fse 2g9h 2iam 2ian 2icw 2ipk 2oje 2q6w 2seb 2wbj 2xn9 3c5j 3l6f 3o6f 3pdo 3pgc 3pgd 3qxa 3qxd 3s4s 3s5l 3t0e 4aen 4ah2 4c56 4e41 4fqx 4gbx 4h1l 4h25 4h26 4i5b 4is6 4mcy 4mcz 4md0 4md4 4md5 4mdi 4mdj 4ov5 4x5w 4x5x 4y19 4y1a 5jlz 5lax 5v4m 5v4n
        ETXB_STAAU | P015521d5m 1d5x 1d5z 1goz 1sbb 1se3 1se4 1seb 2seb 3gp7 3r8b 3seb 3w2d 4c56 4rgm 4rgn 4rgo

(-) Related Entries Specified in the PDB File

1d5m 1d5x 1d5z