Supervillin modulation of focal adhesions involving TRIP6/ZRP-1

Citations Over TimeTop 21% of 2006 papers

Abstract

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.

Related Papers

• → Tropomyosin Isoform Expression Regulates the Transition of Adhesions To Determine Cell Speed and Direction(2009)78 cited
• → Non-muscle myosin II induces disassembly of actin stress fibres independently of myosin light chain dephosphorylation(2011)47 cited
• → The molecular basis of thin filament activation: from single molecule to muscle(2017)34 cited
• → Measurement of enzymatic and motile activities of Arabidopsis myosins by using Arabidopsis actins(2017)11 cited
• → In vitro movements of actin and myosin filaments from muscle(1986)6 cited