1IDO image
Deposition Date 1996-03-12
Release Date 1996-08-01
Last Version Date 2024-02-07
Entry Detail
PDB ID:
1IDO
Keywords:
CELL ADHESION PROTEIN
Title:
I-DOMAIN FROM INTEGRIN CR3, MG2+ BOUND
Biological Source:
Source Organism(s):
Homo sapiens (Taxon ID: 9606)
Expression System(s):
Escherichia coli
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
1.70 Å
R-Value Work:
0.20
R-Value Observed:
0.20
Space Group:
P 43
1IDO validation report
Macromolecular Entities
Structures with similar UniProt ID
Protein Blast
Polymer Type:polypeptide(L)
Molecule:INTEGRIN
Gene (Uniprot):ITGAM
Chain IDs:A
Chain Length:189
Number of Molecules:1
Biological Source:Homo sapiens
UniProt ID:P11215 Pfam ID:PF00092
Ligand Molecules
MG
Primary Citation
Crystal structure of the A domain from the alpha subunit of integrin CR3 (CD11b/CD18).
Cell(Cambridge,Mass.) 80 631 638 (1995)
PMID: 7867070 DOI: 10.1016/0092-8674(95)90517-0

Abstact

We have determined the high resolution crystal structure of the A domain from the alpha chain of integrin CR3. The domain adopts a classic alpha/beta "Rossmann" fold and contains an unusual Mg2+ coordination site at its surface. One of the coordinating ligands is the glutamate side chain from another A domain molecule. We suggest that this site represents a general metal ion-dependent adhesion site (MIDAS) for binding protein ligands. We further propose that the beta subunits of integrins contain a MIDAS motif within a modified A domain. Our crystal structure will allow reliable models to be built for other members of the A domain superfamily and should facilitate development of novel adhesion modulatory drugs.

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Primary Citation of related structures
1IDO
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