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Published 31 July 2006. doi:10.1083/jcb.200512051
The Rockefeller University Press, 0021-9525 $8.00
JCB, Volume 174, Number 3, 447-458
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Article

 Supervillin modulation of focal adhesions involving TRIP6/ZRP-1

Norio Takizawa1, Tara C. Smith1, Thomas Nebl1, Jessica L. Crowley1, Stephen J. Palmieri1, Lawrence M. Lifshitz2, Anka G. Ehrhardt1, Laura M. Hoffman3, Mary C. Beckerle3, and Elizabeth J. Luna1

1 Department of Cell Biology, and 2 Department of Physiology, University of Massachusetts Medical School, Worcester, MA 01605
3 Huntsman Cancer Institute, University of Utah, Salt Lake City, UT 84112

Correspondence to Elizabeth J. Luna: Luna{at}umassmed.edu

Cell–substrate contacts, called focal adhesions (FAs), are dynamic in rapidly moving cells. We show that supervillin (SV)—a peripheral membrane protein that binds myosin II and F-actin in such cells—negatively regulates stress fibers, FAs, and cell–substrate adhesion. The major FA regulatory sequence within SV (SV342-571) binds to the LIM domains of two proteins in the zyxin family, thyroid receptor–interacting protein 6 (TRIP6) and lipoma-preferred partner (LPP), but not to zyxin itself. SV and TRIP6 colocalize within large FAs, where TRIP6 may help recruit SV. RNAi-mediated decreases in either protein increase cell adhesion to fibronectin. TRIP6 partially rescues SV effects on stress fibers and FAs, apparently by mislocating SV away from FAs. Thus, SV interactions with TRIP6 at FAs promote loss of FA structure and function. SV and TRIP6 binding partners suggest several specific mechanisms through which the SV–TRIP6 interaction may regulate FA maturation and/or disassembly.

T. Nebl's present address is Department of Infection and Immunity, The Walter and Eliza Hall Institute of Medical Research, VIC 3050, Australia.

S.J. Palmieri's present address is Sensor Technologies, Shrewsbury, MA 01545.

Abbreviations used in this paper: ATCC, American Type Culture Collection; AV, archvillin; CAS, Crk-associated substrate; ERK, extracellular factor–regulated kinase; ds, double-stranded; FA, focal adhesion; LPA, lysophosphatidic acid; LPP, lipoma-preferred partner; PTP, protein tyrosine phosphatase; SmAV, smooth muscle AV; SV, supervillin; TRIP, thyroid receptor–interacting protein; ZRP-1, zyxin-related protein 1.


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