2M32 image
Deposition Date 2013-01-07
Release Date 2013-11-06
Last Version Date 2025-03-26
Entry Detail
PDB ID:
2M32
Keywords:
Title:
Alpha-1 integrin I-domain in complex with GLOGEN triple helical peptide
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
(Taxon ID: )
Host Organism:
Method Details:
Experimental Method:
Conformers Calculated:
200
Conformers Submitted:
10
Selection Criteria:
structures with the lowest energy
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Integrin alpha-1
Gene (Uniprot):ITGA1
Chain IDs:A
Chain Length:192
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:GLOGEN peptide
Chain IDs:B, C, D
Chain Length:23
Number of Molecules:3
Biological Source:
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
HYP B PRO 4-HYDROXYPROLINE
Ligand Molecules
Primary Citation
The Structure of Integrin alpha 1I Domain in Complex with a Collagen-mimetic Peptide.
J.Biol.Chem. 288 36796 36809 (2013)
PMID: 24187131 DOI: 10.1074/jbc.M113.480251

Abstact

We have determined the structure of the human integrin α1I domain bound to a triple-helical collagen peptide. The structure of the α1I-peptide complex was investigated using data from NMR, small angle x-ray scattering, and size exclusion chromatography that were used to generate and validate a model of the complex using the data-driven docking program, HADDOCK (High Ambiguity Driven Biomolecular Docking). The structure revealed that the α1I domain undergoes a major conformational change upon binding of the collagen peptide. This involves a large movement in the C-terminal helix of the αI domain that has been suggested to be the mechanism by which signals are propagated in the intact integrin receptor. The structure suggests a basis for the different binding selectivity observed for the α1I and α2I domains. Mutational data identify residues that contribute to the conformational change observed. Furthermore, small angle x-ray scattering data suggest that at low collagen peptide concentrations the complex exists in equilibrium between a 1:1 and 2:1 α1I-peptide complex.

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Primary Citation of related structures