1U8C image
Entry Detail
PDB ID:
1U8C
Keywords:
Title:
A novel adaptation of the integrin PSI domain revealed from its crystal structure
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2004-08-05
Release Date:
2004-12-28
Method Details:
Experimental Method:
Resolution:
3.10 Å
R-Value Free:
0.36
R-Value Work:
0.29
R-Value Observed:
0.29
Space Group:
P 32 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Integrin alpha-V
Chain IDs:A
Chain Length:957
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Integrin beta-3
Chain IDs:B
Chain Length:692
Number of Molecules:1
Biological Source:Homo sapiens
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
ASN A ASN GLYCOSYLATION SITE
Primary Citation
A novel adaptation of the integrin PSI domain revealed from its crystal structure.
J.Biol.Chem. 279 40252 40254 (2004)
PMID: 15299032 DOI: 10.1074/jbc.C400362200

Abstact

Integrin beta-subunits contain an N-terminal PSI (for plexin-semaphorin-integrin) domain that contributes to integrin activation and harbors the PI(A) alloantigen associated with immune thrombocytopenias and susceptibility to sudden cardiac death. Here we report the crystal structure of PSI in the context of the crystallized alphaVbeta3 ectodomain. The integrin PSI forms a two-stranded antiparallel beta-sheet flanked by two short helices; its long interstrand loop houses Pl(A) and may face the EGF2 domain. The integrin PSI contains four cysteine pairs connected in a 1-4, 2-8, 3-6, 5-7 pattern. An unexpected feature of the structure is that the final, eighth cysteine is located C-terminal to the Ig-like hybrid domain and is thus separated by the hybrid domain from the other seven cysteines of PSI. This architecture may be relevant to the evolution of integrins and should help refine the current models of integrin activation.

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Primary Citation of related structures