5IC1

Structural analysis of a talin triple domain module, E1794Y, E1797Y, Q1801Y mutant

Summary for 5IC1

• Entry DOI: 10.2210/pdb5ic1/pdb
• Related: 4W8P 5IC0
• Descriptor: Talin-1, 1,2-ETHANEDIOL (3 entities in total)
• Functional Keywords: integrin, riam, autoinhibition, alternative, peptide binding protein
• Biological source: Mus musculus (Mouse)
• Total number of polymer chains: 1
• Total formula weight: 49592.77

Authors

Wu, J.,Chang, Y.-C.E.,Zhang, H.,Huang, Q.-Q. (deposition date: 2016-02-22, release date: 2016-05-18, Last modification date: 2023-09-27)

Primary citation

Zhang, H.,Chang, Y.C.,Huang, Q.,Brennan, M.L.,Wu, J.
Structural and Functional Analysis of a Talin Triple-Domain Module Suggests an Alternative Talin Autoinhibitory Configuration.
Structure, 24:721-729, 2016

PubMed Abstract: Talin plays an important role in regulating integrin-mediated signaling. Talin function is autoinhibited by intramolecular interactions between the integrin-binding F3 domain and the autoinhibitory domain (R9). We determined the crystal structure of a triple-domain fragment, R7R8R9, which contains R9 and the RIAM (Rap1-interacting adaptor molecule) binding domain (R8). The structure reveals a crystallographic contact between R9 and a symmetrically related R8 domain, representing a homodimeric interaction in talin. Strikingly, we demonstrated that the α5 helix of R9 also interacts with the F3 domain, despite no interdomain contact involving the α5 helix in the crystal structure of an F2F3:R9 autoinhibitory complex reported previously. Mutations on the α5 helix significantly diminish the F3:R9 association and lead to elevated talin activity. Our results offer biochemical and functional evidence of the existence of a new talin autoinhibitory configuration, thus providing a more comprehensive understanding of talin autoinhibition, regulation, and quaternary structure assembly.

PubMed: 27150043
DOI: 10.1016/j.str.2016.02.020

Experimental method

X-RAY DIFFRACTION (2.2 Å)