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(-) Description

Title :  STRUCTURE OF ACTIVATED G-ALPHA-I1 BOUND TO A NUCLEOTIDE-STATE-SELECTIVE PEPTIDE: MINIMAL DETERMINANTS FOR RECOGNIZING THE ACTIVE FORM OF A G PROTEIN ALPHA SUBUNIT
 
Authors :  C. A. Johnston, J. K. Ramer, R. Blaesius, B. Kuhlman, V. Y. Arshavsky, D. P. Siderovski
Date :  01 Mar 06  (Deposition) - 10 Oct 06  (Release) - 24 Feb 09  (Revision)
Method :  X-RAY DIFFRACTION
Resolution :  2.80
Chains :  Asym. Unit :  A,B,C,D
Biol. Unit 1:  A,C  (1x)
Biol. Unit 2:  B,D  (1x)
Keywords :  Guanine-Nucleotide Binding Protein, Phage Display Peptide, Signaling Protein (Keyword Search: [Gene Ontology, PubMed, Web (Google))
 
Reference :  C. A. Johnston, E. S. Lobanova, A. S. Shavkunov, J. Low, J. K. Ramer, R. Blaesius, Z. Fredericks, F. S. Willard, B. Kuhlman, V. Y. Arshavsky, D. P. Siderovski
Minimal Determinants For Binding Activated Galpha From The Structure Of A Galpha(I1)-Peptide Dimer.
Biochemistry V. 45 11390 2006
PubMed-ID: 16981699  |  Reference-DOI: 10.1021/BI0613832
(for further references see the PDB file header)

(-) Compounds

Molecule 1 - GUANINE NUCLEOTIDE-BINDING PROTEIN G(I), ALPHA-1 SUBUNIT
    ChainsA, B
    EngineeredYES
    Expression SystemESCHERICHIA COLI BL21(DE3)
    Expression System PlasmidPPRO-EXHTB1
    Expression System StrainBL21(DE3)
    Expression System Taxid469008
    Expression System Vector TypePLASMID
    GeneGNAI1
    Organism CommonHUMAN
    Organism ScientificHOMO SAPIENS
    Organism Taxid9606
    SynonymADENYLATE CYCLASE-INHIBITING G ALPHA PROTEIN
 
Molecule 2 - KB-1753 PHAGE DISPLAY PEPTIDE
    ChainsC, D
    EngineeredYES
    Other DetailsPHAGE-DERIVED PEPTIDE
    SyntheticYES

 Structural Features

(-) Chains, Units

  1234
Asymmetric Unit ABCD
Biological Unit 1 (1x)A C 
Biological Unit 2 (1x) B D

Summary Information (see also Sequences/Alignments below)

(-) Ligands, Modified Residues, Ions  (3, 6)

Asymmetric Unit (3, 6)
No.NameCountTypeFull Name
1ALF2Ligand/IonTETRAFLUOROALUMINATE ION
2GDP2Ligand/IonGUANOSINE-5'-DIPHOSPHATE
3MG2Ligand/IonMAGNESIUM ION
Biological Unit 1 (2, 2)
No.NameCountTypeFull Name
1ALF1Ligand/IonTETRAFLUOROALUMINATE ION
2GDP1Ligand/IonGUANOSINE-5'-DIPHOSPHATE
3MG-1Ligand/IonMAGNESIUM ION
Biological Unit 2 (2, 2)
No.NameCountTypeFull Name
1ALF1Ligand/IonTETRAFLUOROALUMINATE ION
2GDP1Ligand/IonGUANOSINE-5'-DIPHOSPHATE
3MG-1Ligand/IonMAGNESIUM ION

(-) Sites  (6, 6)

Asymmetric Unit (6, 6)
No.NameEvidenceResiduesDescription
1AC1SOFTWAREGLY A:42 , GLU A:43 , LYS A:46 , ARG A:178 , LYS A:180 , THR A:181 , GLY A:203 , GLN A:204 , GDP A:355 , MG A:356BINDING SITE FOR RESIDUE ALF A 357
2AC2SOFTWAREHOH B:1 , GLY B:42 , GLU B:43 , LYS B:46 , ARG B:178 , LYS B:180 , THR B:181 , VAL B:201 , GLY B:202 , GLY B:203 , GLN B:204 , GDP B:355 , MG B:358BINDING SITE FOR RESIDUE ALF B 359
3AC3SOFTWARESER A:47 , ARG A:178 , VAL A:179 , THR A:181 , GDP A:355 , ALF A:357BINDING SITE FOR RESIDUE MG A 356
4AC4SOFTWARESER B:47 , VAL B:179 , THR B:181 , GDP B:355 , ALF B:359BINDING SITE FOR RESIDUE MG B 358
5AC5SOFTWAREHOH A:2 , HOH A:13 , GLU A:43 , SER A:44 , GLY A:45 , LYS A:46 , SER A:47 , THR A:48 , SER A:151 , LEU A:175 , ARG A:176 , THR A:177 , ARG A:178 , THR A:181 , ASN A:269 , LYS A:270 , ASP A:272 , LEU A:273 , CYS A:325 , ALA A:326 , MG A:356 , ALF A:357BINDING SITE FOR RESIDUE GDP A 355
6AC6SOFTWAREHOH B:1 , GLU B:43 , SER B:44 , GLY B:45 , LYS B:46 , SER B:47 , THR B:48 , SER B:151 , LEU B:175 , ARG B:176 , ARG B:178 , THR B:181 , ASN B:269 , LYS B:270 , ASP B:272 , LEU B:273 , CYS B:325 , ALA B:326 , MG B:358 , ALF B:359BINDING SITE FOR RESIDUE GDP B 355

(-) SS Bonds  (0, 0)

(no "SS Bond" information available for 2G83)

(-) Cis Peptide Bonds  (0, 0)

(no "Cis Peptide Bond" information available for 2G83)

 Sequence-Structure Mapping

(-) SAPs(SNPs)/Variants  (0, 0)

(no "SAP(SNP)/Variant" information available for 2G83)

(-) PROSITE Motifs  (0, 0)

(no "PROSITE Motif" information available for 2G83)

(-) Exons   (8, 16)

Asymmetric Unit (8, 16)
 ENSEMBLUniProtKBPDB
No.Transcript IDExonExon IDGenome LocationLengthIDLocationLengthCountLocationLength
1.4aENST000003510044aENSE00001371927chr7:79764104-79764594491GNAI1_HUMAN1-40402A:33-40
B:33-40
8
8
1.8ENST000003510048ENSE00001626524chr7:79818267-7981830943GNAI1_HUMAN40-54152A:40-54
B:40-54
15
15
1.9bENST000003510049bENSE00001129655chr7:79818406-79818547142GNAI1_HUMAN54-101482A:54-101
B:54-101
48
48
1.10ENST0000035100410ENSE00000877050chr7:79828541-79828698158GNAI1_HUMAN102-154532A:102-154 (gaps)
B:102-154 (gaps)
53
53
1.11ENST0000035100411ENSE00002174891chr7:79833020-79833148129GNAI1_HUMAN154-197442A:154-197
B:154-197
44
44
1.12ENST0000035100412ENSE00001369917chr7:79840285-79840414130GNAI1_HUMAN197-240442A:197-240
B:197-240
44
44
1.13ENST0000035100413ENSE00001591517chr7:79842032-79842185154GNAI1_HUMAN241-292522A:241-292
B:241-292
52
52
1.14bENST0000035100414bENSE00001303419chr7:79846619-798487182100GNAI1_HUMAN292-354632A:292-345
B:292-345
54
54

(-) Sequences/Alignments

Asymmetric 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:303
 aligned with GNAI1_HUMAN | P63096 from UniProtKB/Swiss-Prot  Length:354

    Alignment length:313
                                    42        52        62        72        82        92       102       112       122       132       142       152       162       172       182       192       202       212       222       232       242       252       262       272       282       292       302       312       322       332       342   
          GNAI1_HUMAN    33 EVKLLLLGAGESGKSTIVKQMKIIHEAGYSEEECKQYKAVVYSNTIQSIIAIIRAMGRLKIDFGDSARADDARQLFVLAGAAEEGFMTAELAGVIKRLWKDSGVQACFNRSREYQLNDSAAYYLNDLDRIAQPNYIPTQQDVLRTRVKTTGIVETHFTFKDLHFKMFDVGGQRSERKKWIHCFEGVTAIIFCVALSDYDLVLAEDEEMNRMHESMKLFDSICNNKWFTDTSIILFLNKKDLFEEKIKKSPLTICYPEYAGSNTYEEAAAYIQCQFEDLNKRKDTKEIYTHFTCATDTKNVQFVFDAVTDVIIK 345
               SCOP domains d2g83a2 A:33-60,A:182-345   d2g83a1 A:61-181 Transducin (alpha subunit), insert          ion domain                                                  d2g83a2 A:33-60,A:182-345 Transducin (alpha subunit)                                                                                                                 SCOP domains
               CATH domains 2g83A01 A:33-61,A:181-345    2g83A02 A:62-180 GI Alpha 1, domain 2-like                                                                             2g83A01 A:33-61,A:181-345 P-loop containing nucleotide triphosphate hydrolases                                                                                        CATH domains
               Pfam domains ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author .eeeeeee......hhhhhhhhhh.....hhhhhhh..hhhhhhhhhhhhhhhhhhhhhh....hhhhhhhhhhhhh..----------.hhhhhhhhhhhhhhhhh..hhhhh...hhhhh....hhhhhh.....hhhhhhh........eeeeeee..eeeeeee...hhhhhhhhhhhh....eeeeeee.hhh..ee..eeeee.hhhhhhhhhhhh........eeeeeeehhhhhhhhh...hhhhh........hhhhhhhhhhhhhhh.........eeeeee...hhhhhhhhhhhhhhhhh. Sec.struct. author
                 SAPs(SNPs) ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- PROSITE
           Transcript 1 (1) 1.4a    -------------Exon 1.9b  PDB: A:54-101 UniProt: 54-101        Exon 1.10  PDB: A:102-154 (gaps) UniProt: 102-154    ------------------------------------------Exon 1.12  PDB: A:197-240 UniProt: 197-240  Exon 1.13  PDB: A:241-292 UniProt: 241-292          ----------------------------------------------------- Transcript 1 (1)
           Transcript 1 (2) -------Exon 1.8       ---------------------------------------------------------------------------------------------------Exon 1.11  PDB: A:154-197 UniProt: 154-197  ----------------------------------------------------------------------------------------------Exon 1.14b  PDB: A:292-345 UniProt: 292-354            Transcript 1 (2)
                 2g83 A  33 EVKLLLLGAGESGKSTIVKQMKIIHEAGYSEEECKQYKAVVYSNTIQSIIAIIRAMGRLKIDFGDSARADDARQLFVLA----------ELAGVIKRLWKDSGVQACFNRSREYQLNDSAAYYLNDLDRIAQPNYIPTQQDVLRTRVKTTGIVETHFTFKDLHFKMFDVGGQRSERKKWIHCFEGVTAIIFCVALSDYDLVLAEDEEMNRMHESMKLFDSICNNKWFTDTSIILFLNKKDLFEEKIKKSPLTICYPEYAGSNTYEEAAAYIQCQFEDLNKRKDTKEIYTHFTCATDTKNVQFVFDAVTDVIIK 345
                                    42        52        62        72        82        92       102        |-       122       132       142       152       162       172       182       192       202       212       222       232       242       252       262       272       282       292       302       312       322       332       342   
                                                                                                        111        122                                                                                                                                                                                                                               

Chain B from PDB  Type:PROTEIN  Length:303
 aligned with GNAI1_HUMAN | P63096 from UniProtKB/Swiss-Prot  Length:354

    Alignment length:313
                                    42        52        62        72        82        92       102       112       122       132       142       152       162       172       182       192       202       212       222       232       242       252       262       272       282       292       302       312       322       332       342   
          GNAI1_HUMAN    33 EVKLLLLGAGESGKSTIVKQMKIIHEAGYSEEECKQYKAVVYSNTIQSIIAIIRAMGRLKIDFGDSARADDARQLFVLAGAAEEGFMTAELAGVIKRLWKDSGVQACFNRSREYQLNDSAAYYLNDLDRIAQPNYIPTQQDVLRTRVKTTGIVETHFTFKDLHFKMFDVGGQRSERKKWIHCFEGVTAIIFCVALSDYDLVLAEDEEMNRMHESMKLFDSICNNKWFTDTSIILFLNKKDLFEEKIKKSPLTICYPEYAGSNTYEEAAAYIQCQFEDLNKRKDTKEIYTHFTCATDTKNVQFVFDAVTDVIIK 345
               SCOP domains d2g83b2 B:33-60,B:182-345   d2g83b1 B:61-181 Transducin (alpha subunit), insert          ion domain                                                  d2g83b2 B:33-60,B:182-345 Transducin (alpha subunit)                                                                                                                 SCOP domains
               CATH domains 2g83B01 B:33-61,B:181-345    2g83B02 B:62-180 GI Alpha 1, domain 2-like                                                                             2g83B01 B:33-61,B:181-345 P-loop containing nucleotide triphosphate hydrolases                                                                                        CATH domains
               Pfam domains ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author .eeeeee......hhhhhhhhhhh.......hhhhhhhhhhhhhhhhhhhhhhhhhhhhh....hhhhhhhhhhhh...----------.....hhhhhh.hhhhhhh.hhhhh....hhhhhhh............hhhhhhh........eeeeeee..eeeeeee...hhhhhhhhhhhh....eeeeeee.hhh..........hhhhhhhhhhhhhhh.......eeeeeeehhhhhhhhh...hhhhh........hhhhhhhhhhhhhh..........eeeeee.....hhhhhhhhhhhhhh.. Sec.struct. author
                 SAPs(SNPs) ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- PROSITE
           Transcript 1 (1) 1.4a    -------------Exon 1.9b  PDB: B:54-101 UniProt: 54-101        Exon 1.10  PDB: B:102-154 (gaps) UniProt: 102-154    ------------------------------------------Exon 1.12  PDB: B:197-240 UniProt: 197-240  Exon 1.13  PDB: B:241-292 UniProt: 241-292          ----------------------------------------------------- Transcript 1 (1)
           Transcript 1 (2) -------Exon 1.8       ---------------------------------------------------------------------------------------------------Exon 1.11  PDB: B:154-197 UniProt: 154-197  ----------------------------------------------------------------------------------------------Exon 1.14b  PDB: B:292-345 UniProt: 292-354            Transcript 1 (2)
                 2g83 B  33 EVKLLLLGAGESGKSTIVKQMKIIHEAGYSEEECKQYKAVVYSNTIQSIIAIIRAMGRLKIDFGDSARADDARQLFVLA----------ELAGVIKRLWKDSGVQACFNRSREYQLNDSAAYYLNDLDRIAQPNYIPTQQDVLRTRVKTTGIVETHFTFKDLHFKMFDVGGQRSERKKWIHCFEGVTAIIFCVALSDYDLVLAEDEEMNRMHESMKLFDSICNNKWFTDTSIILFLNKKDLFEEKIKKSPLTICYPEYAGSNTYEEAAAYIQCQFEDLNKRKDTKEIYTHFTCATDTKNVQFVFDAVTDVIIK 345
                                    42        52        62        72        82        92       102        |-       122       132       142       152       162       172       182       192       202       212       222       232       242       252       262       272       282       292       302       312       322       332       342   
                                                                                                        111        122                                                                                                                                                                                                                               

Chain C from PDB  Type:PROTEIN  Length:11
                                           
               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
                 2g83 C   3 RGYYHGIWVGE  13
                                    12 

Chain D from PDB  Type:PROTEIN  Length:11
                                           
               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
                 2g83 D   3 RGYYHGIWVGE  13
                                    12 

   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  (2, 4)

Asymmetric Unit

(-) CATH Domains  (2, 4)

Asymmetric Unit
(-)
Class: Alpha Beta (26913)

(-) Pfam Domains  (0, 0)

(no "Pfam Domain" information available for 2G83)

(-) Gene Ontology  (38, 38)

Asymmetric Unit(hide GO term definitions)
Chain A,B   (GNAI1_HUMAN | P63096)
molecular function
    GO:0031683    G-protein beta/gamma-subunit complex binding    Interacting selectively and non-covalently with a complex of G-protein beta/gamma subunits.
    GO:0001664    G-protein coupled receptor binding    Interacting selectively and non-covalently with a G-protein coupled receptor.
    GO:0031821    G-protein coupled serotonin receptor binding    Interacting selectively and non-covalently with a metabotropic serotonin receptor.
    GO:0019003    GDP binding    Interacting selectively and non-covalently with GDP, guanosine 5'-diphosphate.
    GO:0005525    GTP binding    Interacting selectively and non-covalently with GTP, guanosine triphosphate.
    GO:0032794    GTPase activating protein binding    Interacting selectively and non-covalently with a GTPase activating protein.
    GO:0003924    GTPase activity    Catalysis of the reaction: GTP + H2O = GDP + phosphate.
    GO:0019001    guanyl nucleotide binding    Interacting selectively and non-covalently with guanyl nucleotides, any compound consisting of guanosine esterified with (ortho)phosphate.
    GO:0000287    magnesium ion binding    Interacting selectively and non-covalently with magnesium (Mg) ions.
    GO:0046872    metal ion binding    Interacting selectively and non-covalently with any metal ion.
    GO:0000166    nucleotide binding    Interacting selectively and non-covalently with a nucleotide, any compound consisting of a nucleoside that is esterified with (ortho)phosphate or an oligophosphate at any hydroxyl group on the ribose or deoxyribose.
    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:0004871    signal transducer activity    Conveys a signal across a cell to trigger a change in cell function or state. A signal is a physical entity or change in state that is used to transfer information in order to trigger a response.
biological process
    GO:0007186    G-protein coupled receptor signaling pathway    A series of molecular signals that proceeds with an activated receptor promoting the exchange of GDP for GTP on the alpha-subunit of an associated heterotrimeric G-protein complex. The GTP-bound activated alpha-G-protein then dissociates from the beta- and gamma-subunits to further transmit the signal within the cell. The pathway begins with receptor-ligand interaction, or for basal GPCR signaling the pathway begins with the receptor activating its G protein in the absence of an agonist, and ends with regulation of a downstream cellular process, e.g. transcription. The pathway can start from the plasma membrane, Golgi or nuclear membrane (PMID:24568158 and PMID:16902576).
    GO:0007193    adenylate cyclase-inhibiting G-protein coupled receptor signaling pathway    The series of molecular signals generated as a consequence of a G-protein coupled receptor binding to its physiological ligand, where the pathway proceeds through inhibition of adenylyl cyclase activity and a subsequent decrease in the concentration of cyclic AMP (cAMP).
    GO:0007188    adenylate cyclase-modulating G-protein coupled receptor signaling pathway    The series of molecular signals generated as a consequence of a G-protein coupled receptor binding to its physiological ligand, where the pathway proceeds through activation or inhibition of adenylyl cyclase activity and a subsequent change in the concentration of cyclic AMP (cAMP).
    GO:0007049    cell cycle    The progression of biochemical and morphological phases and events that occur in a cell during successive cell replication or nuclear replication events. Canonically, the cell cycle comprises the replication and segregation of genetic material followed by the division of the cell, but in endocycles or syncytial cells nuclear replication or nuclear division may not be followed by cell division.
    GO:0051301    cell division    The process resulting in division and partitioning of components of a cell to form more cells; may or may not be accompanied by the physical separation of a cell into distinct, individually membrane-bounded daughter cells.
    GO:1904322    cellular response to forskolin    Any process that results in a change in state or activity of a cell (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of a forskolin stimulus.
    GO:0050805    negative regulation of synaptic transmission    Any process that stops, prevents, or reduces the frequency, rate or extent of synaptic transmission, the process of communication from a neuron to a target (neuron, muscle, or secretory cell) across a synapse.
    GO:0006457    protein folding    The process of assisting in the covalent and noncovalent assembly of single chain polypeptides or multisubunit complexes into the correct tertiary structure.
    GO:0043949    regulation of cAMP-mediated signaling    Any process which modulates the frequency, rate or extent of cAMP-mediated signaling, a series of molecular signals in which a cell uses cyclic AMP to convert an extracellular signal into a response.
    GO:0043434    response to peptide hormone    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 peptide hormone stimulus. A peptide hormone is any of a class of peptides that are secreted into the blood stream and have endocrine functions in living animals.
    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:0005813    centrosome    A structure comprised of a core structure (in most organisms, a pair of centrioles) and peripheral material from which a microtubule-based structure, such as a spindle apparatus, is organized. Centrosomes occur close to the nucleus during interphase in many eukaryotic cells, though in animal cells it changes continually during the cell-division cycle.
    GO:0005737    cytoplasm    All of the contents of a cell excluding the plasma membrane and nucleus, but including other subcellular structures.
    GO:0005856    cytoskeleton    Any of the various filamentous elements that form the internal framework of cells, and typically remain after treatment of the cells with mild detergent to remove membrane constituents and soluble components of the cytoplasm. The term embraces intermediate filaments, microfilaments, microtubules, the microtrabecular lattice, and other structures characterized by a polymeric filamentous nature and long-range order within the cell. The various elements of the cytoskeleton not only serve in the maintenance of cellular shape but also have roles in other cellular functions, including cellular movement, cell division, endocytosis, and movement of organelles.
    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:0005834    heterotrimeric G-protein complex    Any of a family of heterotrimeric GTP-binding and hydrolyzing proteins; they belong to a superfamily of GTPases that includes monomeric proteins such as EF-Tu and RAS. Heterotrimeric G-proteins consist of three subunits; the alpha subunit contains the guanine nucleotide binding site and possesses GTPase activity; the beta and gamma subunits are tightly associated and function as a beta-gamma heterodimer; extrinsic plasma membrane proteins (cytoplasmic face) that function as a complex to transduce signals from G-protein coupled receptors to an effector protein.
    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:0005765    lysosomal membrane    The lipid bilayer surrounding the lysosome and separating its contents from the cell cytoplasm.
    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:0005815    microtubule organizing center    An intracellular structure that can catalyze gamma-tubulin-dependent microtubule nucleation and that can anchor microtubules by interacting with their minus ends, plus ends or sides.
    GO:0030496    midbody    A thin cytoplasmic bridge formed between daughter cells at the end of cytokinesis. The midbody forms where the contractile ring constricts, and may persist for some time before finally breaking to complete cytokinesis.
    GO:0005634    nucleus    A membrane-bounded organelle of eukaryotic cells in which chromosomes are housed and replicated. In most cells, the nucleus contains all of the cell's chromosomes except the organellar chromosomes, and is the site of RNA synthesis and processing. In some species, or in specialized cell types, RNA metabolism or DNA replication may be absent.
    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:0043234    protein complex    A stable macromolecular complex composed (only) of two or more polypeptide subunits along with any covalently attached molecules (such as lipid anchors or oligosaccharide) or non-protein prosthetic groups (such as nucleotides or metal ions). Prosthetic group in this context refers to a tightly bound cofactor. The component polypeptide subunits may be identical.

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 Related Entries

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        GNAI1_HUMAN | P630961kjy 1y3a 2gtp 2ik8 2om2 2xns 3onw 3qe0 3qi2 3umr 3ums 4g5q 5js7 5js8 5tdh

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