A proteomic approach reveals integrin activation state-dependent control of microtubule cortical targeting

: Byron A, Askari JA, Humphries JD, Jacquemet G, Koper EJ, Warwood S, Choi CK, Stroud MJ, Chen CS, Knight D, Humphries MJ

Publisher: NATURE PUBLISHING GROUP

: 2015

: Nature Communications

: NAT COMMUN

: ARTN 6135

: 6

: 14

: 2041-1723

DOI: https://doi.org/10.1038/ncomms7135

Integrin activation, which is regulated by allosteric changes in receptor conformation, enables cellular responses to the chemical, mechanical and topological features of the extracellular microenvironment. A global view of how activation state converts the molecular composition of the region proximal to integrins into functional readouts is, however, lacking. Here, using conformation-specific monoclonal antibodies, we report the isolation of integrin activation state-dependent complexes and their characterization by mass spectrometry. Quantitative comparisons, integrating network, clustering, pathway and image analyses, define multiple functional protein modules enriched in a conformation-specific manner. Notably, active integrin complexes are specifically enriched for proteins associated with microtubule-based functions. Visualization of microtubules on micropatterned surfaces and live cell imaging demonstrate that active integrins establish an environment that stabilizes microtubules at the cell periphery. These data provide a resource for the interrogation of the global molecular connections that link integrin activation to adhesion signalling.

ncomms7135.pdf