Mts1 Regulates the Assembly of Nonmuscle Myosin-IIA†

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Rho kinases (ROCK1 and ROCK2) function downstream of the small GTPase RhoA to drive actomyosin cytoskeletal remodeling. It has often been believed that ROCK1 and ROCK2 may be functionally redundant, as they share a highly conserved kinase domain. However, in this study, we report differential functional effects for these ROCKs at the epithelial zonula adherens (ZA). Using specific siRNA, we found that ROCK1 depletion disrupted cadherin organization at the ZA, accompanied by loss of F-actin and NMIIA, whereas ROCK2 knockdown had no significant effect. Further, ROCK1, but not ROCK2, was necessary to stabilize GTP-RhoA at the ZA, thereby sustaining junctional tension and inhibiting intraepithelial cell movement. We also found that nonmuscle myosin IIA is a major determinant of ROCK1 cortical stability. Thus, despite sharing the catalytic domain with ROCK2, ROCK1 appears to be the dominant kinase essential for junctional integrity and contractile tension at epithelial ZA.


Author(s):  
Shota P. FUKUDA ◽  
Tsubasa S. MATSUI ◽  
Taichi FURUKAWA ◽  
Shuichiro FUKUSHIMA ◽  
Shinji DEGUCHI

1997 ◽  
Vol 231 (2) ◽  
pp. 369-372 ◽  
Author(s):  
Tom W. Ecay ◽  
Tracy D. Conner ◽  
E.Radford Decker

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