Journal ArticleDOI
Regulation of myosin phosphatase by Rho and Rho-associated kinase (Rho-kinase)
Kazushi Kimura,Masaaki Ito,Mutsuki Amano,Kazuyasu Chihara,Yuko Fukata,Masato Nakafuku,Bunpei Yamamori,Jianhua Feng,Takeshi Nakano,Katsuya Okawa,Akihiro Iwamatsu,Kozo Kaibuchi +11 more
Reads0
Chats0
TLDR
Rho appears to inhibit myosin phosphatase through the action of Rho-kinase, which is activated by GTP·RhoA, phosphorylation of MBS and MLC in NIH 3T3 cells.Abstract:
The small guanosine triphosphatase Rho is implicated in myosin light chain (MLC) phosphorylation, which results in contraction of smooth muscle and interaction of actin and myosin in nonmuscle cells. The guanosine triphosphate (GTP)-bound, active form of RhoA (GTP.RhoA) specifically interacted with the myosin-binding subunit (MBS) of myosin phosphatase, which regulates the extent of phosphorylation of MLC. Rho-associated kinase (Rho-kinase), which is activated by GTP.RhoA, phosphorylated MBS and consequently inactivated myosin phosphatase. Overexpression of RhoA or activated RhoA in NIH 3T3 cells increased phosphorylation of MBS and MLC. Thus, Rho appears to inhibit myosin phosphatase through the action of Rho-kinase.read more
Citations
More filters
Journal ArticleDOI
Rho GTPases and the Actin Cytoskeleton
TL;DR: Members of the Rho family of small guanosine triphosphatases have emerged as key regulators of the actin cytoskeleton, and through their interaction with multiple target proteins, they ensure coordinated control of other cellular activities such as gene transcription and adhesion.
Journal ArticleDOI
Specificity and mechanism of action of some commonly used protein kinase inhibitors
TL;DR: The results demonstrate that the specificities of protein kinase inhibitors cannot be assessed simply by studying their effect on kinases that are closely related in primary structure, and proposes guidelines for the use of protein Kinase inhibitors in cell-based assays.
Journal ArticleDOI
Cell shape, cytoskeletal tension, and rhoa regulate stem cell lineage commitment
TL;DR: It is demonstrated that cell shape regulates commitment of human mesenchymal stem cells to adipocyte or osteoblast fate and mechanical cues experienced in developmental and adult contexts, embodied by cell shape, cytoskeletal tension, and RhoA signaling, are integral to the commitment of stem cell fate.
Journal ArticleDOI
Myofibroblasts and mechano-regulation of connective tissue remodelling
TL;DR: It is clear that the understanding of the myofibroblast — its origins, functions and molecular regulation — will have a profound influence on the future effectiveness not only of tissue engineering but also of regenerative medicine generally.
Journal ArticleDOI
Calcium sensitization of smooth muscle mediated by a Rho-associated protein kinase in hypertension
Masayoshi Uehata,Toshimasa Ishizaki,Hiroyuki Satoh,Takashi Ono,Toshio Kawahara,Tamami Morishita,Hiroki Tamakawa,Keiji Yamagami,Jun Inui,Midori Maekawa,Shuh Narumiya +10 more
TL;DR: Pyridine derivative Y-27632 consistently suppresses Rho-induced, p160ROCK-mediated formation of stress fibres in cultured cells and dramatically corrects hypertension in several hypertensive rat models, suggesting that compounds that inhibit this process might be useful therapeutically.
References
More filters
Journal ArticleDOI
A novel genetic system to detect protein-protein interactions.
Stanley Fields,Ok-kyu Song +1 more
TL;DR: A novel genetic system to study protein-protein interactions between two proteins by taking advantage of the properties of the GAL4 protein of the yeast Saccharomyces cerevisiae, which may be applicable as a general method to identify proteins that interact with a known protein by the use of a simple galactose selection.
Journal ArticleDOI
The small GTP-binding protein rho regulates the assembly of focal adhesions and actin stress fibers in response to growth factors.
Anne J. Ridley,Alan Hall +1 more
TL;DR: Rho, a ras-related GTP-binding protein, rapidly stimulated stress fiber and focal adhesion formation when microinjected into serum-starved Swiss 3T3 cells, implying that rho is essential specifically for the coordinated assembly of focal adhesions and stress fibers induced by growth factors.
Journal ArticleDOI
Mammalian Ras interacts directly with the serine/threonine kinase Raf
TL;DR: Raf interacts with wild-type and activated Ras, but not with an effector domain mutant of Ras or with a dominant-interfering Ras mutant, and this interaction is dependent on GTP bound to Ras.
Journal ArticleDOI
Rho-associated kinase, a novel serine/threonine kinase, as a putative target for small GTP binding protein Rho
Takeshi Matsui,Mutsuki Amano,Takaharu Yamamoto,Kazuyasu Chihara,Masato Nakafuku,Mikako Ito,Takeshi Nakano,K. Okawa,A. Iwamatsu,Kozo Kaibuchi +9 more
TL;DR: P purified a Rho‐interacting protein with a molecular mass of approximately 164 kDa (p164) from bovine brain that bound to GTPgammaS (a non‐hydrolyzable GTP analog) and is likely to be a putative target serine/threonine kinase for Rho and serves as a mediator of the RHo‐dependent signaling pathway.
Journal ArticleDOI
The Function of Myosin and Myosin Light Chain Kinase Phosphorylation in Smooth Muscle
Kristine E Kamm,James T. Stull +1 more
TL;DR: The discoveries that the 20,OOO-dalton light chain of smooth muscle myosin could be phosphorylated, and that the phosphoryla tion of smooth Muscle Myosin is ass ociated with an increase in its actin activated, are made.