Macromolecule Content

• Total Structure Weight: 7.76 kDa 
• Atom Count: 395 
• Residue Count: 47 
• Unique protein chains: 1

1S4X

NMR Structure of the integrin B3 cytoplasmic domain in DPC micelles

• DOI: 10.2210/pdb1S4X/pdb

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


• Deposited: 2004-01-19 Released: 2004-03-09 
• Deposition Author(s): Vinogradova, O., Vaynberg, J., Kong, X., Haas, T.A., Plow, E.F., Qin, J.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 88 
• Conformers Submitted: 20 
• Selection Criteria: structures with the least restraint violations 

Literature

Membrane-mediated structural transitions at the cytoplasmic face during integrin activation.

Vinogradova, O., Vaynberg, J., Kong, X., Haas, T.A., Plow, E.F., Qin, J.

(2004) Proc Natl Acad Sci U S A 101: 4094-4099

• PubMed: 15024114 
• DOI: 10.1073/pnas.0400742101
• Primary Citation of Related Structures:  
  1S4X, 1S4W


• PubMed Abstract: 
  

Cytoplasmic face-mediated integrin inside-out activation remains a paradigm in transmembrane signal transduction. Emerging evidence suggests that this process involves dissociation of the complex between the integrin cytoplasmic tails; however, a dynamic image of how it occurs on the membrane surface remains elusive. We show here that, whereas membrane-proximal helices of integrin alpha/beta cytoplasmic tails associate in cytoplasm-like aqueous medium, they become partially embedded into membrane-mimetic micelles when unclasped. Membrane embedding induces substantial structural changes of the cytoplasmic tails as compared to their aqueous conformations and suggests there may be an upward movement of the membrane-proximal helices into the membrane during their separation. We further demonstrate that the beta3 tail exhibits additional membrane binding site at its C terminus containing the NPLY motif. Talin, a key intracellular integrin activator, recognizes this site as well as the membrane-proximal helix, thereby promoting cytoplasmic tail separation along the membrane surface. These data provide a structural basis of membrane-mediated changes at the cytoplasmic face in regulating integrin activation and signaling.

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Organizational Affiliation: 

Structural Biology Program, Department of Molecular Cardiology, Joseph J. Jacobs Center for Thrombosis and Vascular Biology, Lerner Research Institute, Cleveland Clinic Foundation, 9500 Euclid Avenue, Cleveland, OH 44195, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Integrin beta-3	A	67	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: 88 
• Conformers Submitted: 20 
• Selection Criteria: structures with the least restraint violations 
• OLDERADO: 1S4X Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2004-01-19 
• Released Date: 2004-03-09 
Deposition Author(s): Vinogradova, O., Vaynberg, J., Kong, X., Haas, T.A., Plow, E.F., Qin, J.

Revision History 

• Version 1.0: 2004-03-09
  Type: Initial release
  
• Version 1.1: 2008-04-29
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance