Macromolecule Content

• Total Structure Weight: 7.98 kDa 
• Atom Count: 564 
• Residue Count: 67 
• Unique protein chains: 2

1M8O

Platelet integrin alfaIIb-beta3 cytoplasmic domain

• DOI: 10.2210/pdb1M8O/pdb

• Classification: MEMBRANE PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2002-07-25 Released: 2002-09-18 
• Deposition Author(s): Vinogradova, O., Velyvis, A., Velyviene, A., Hu, B., Haas, T., Plow, E.F., Qin, J.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 20 
• Conformers Submitted: 20 
• Selection Criteria: structures with favorable non-bond energy 

Literature

A Structural mechanism of integrin alfaiib beta3 "Inside-out" Activation as regulated by its cytoplasmic face.

Vinogradova, O., Velyvis, A., Velyviene, A., Hu, B., Haas, T.A., Plow, E.F., Qin, J.

(2002) Cell 110: 587-597

• PubMed: 12230976 
• DOI: 10.1016/s0092-8674(02)00906-6
• Primary Citation of Related Structures:  
  1M8O


• PubMed Abstract: 
  

Activation of the ligand binding function of integrin heterodimers requires transmission of an "inside-out" signal from their small intracellular segments to their large extracellular domains. The structure of the cytoplasmic domain of a prototypic integrin alpha(IIb)beta(3) has been solved by NMR and reveals multiple hydrophobic and electrostatic contacts within the membrane-proximal helices of its alpha and the beta cytoplasmic tails. The interface interactions are disrupted by point mutations or the cytoskeletal protein talin that are known to activate the receptor. These results provide a structural mechanism by which a handshake between the alpha and the beta cytoplasmic tails restrains the integrin in a resting state and unclasping of this interaction triggers the inside-out conformational signal that leads to receptor activation.

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Organizational Affiliation: 

Structural Biology Program, Cleveland, OH 44195, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
platelet integrin alfaIIb subunit: cytoplasmic domain	A	20	Homo sapiens	Mutation(s): 0  Gene Names: ITGA2B, GP2B, ITGAB
Find proteins for P08514 (Homo sapiens) Explore P08514  Go to UniProtKB:  P08514
NIH Common Fund Data Resources
PHAROS:  P08514 GTEx:  ENSG00000005961

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
platelet integrin beta3 subunit: cytoplasmic domain	B	47	Homo sapiens	Mutation(s): 0  Gene Names: ITGB3, GP3A
Find proteins for P05106 (Homo sapiens) Explore P05106  Go to UniProtKB:  P05106
NIH Common Fund Data Resources
PHAROS:  P05106 GTEx:  ENSG00000259207

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 20 
• Conformers Submitted: 20 
• Selection Criteria: structures with favorable non-bond energy 
• OLDERADO: 1M8O Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2002-07-25 
• Released Date: 2002-09-18 
Deposition Author(s): Vinogradova, O., Velyvis, A., Velyviene, A., Hu, B., Haas, T., Plow, E.F., Qin, J.

Revision History 

• Version 1.0: 2002-09-18
  Type: Initial release
  
• Version 1.1: 2008-04-28
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance