MYPT1 Antibody – Rabbit Polyclonal

Myosin phosphatase target subunit 1, which is also called the myosin-binding subunit of myosin phosphatase, is one of the subunits of myosin phosphatase. Myosin phosphatase regulates the interaction of actin and myosin downstream of the guanosine triphosphatase Rho. 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. Several transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jan 2009]

MYPT1: myosin phosphatase target subunit 1, a regulatory subunit of protein phosphatase 1. Also called the myosin-binding subunit of myosin phosphatase. Myosin phosphatase regulates the interaction of actin and myosin downstream of the guanosine triphosphatase Rho. Four splice-variant isoforms have been described.

Protein type: Motility/polarity/chemotaxis; Protein phosphatase, regulatory subunit

Chromosomal Location of Human Ortholog: 12q21.2-q21.31

Cellular Component: A band; actin cytoskeleton; centrosome; contractile fiber; cytosol; focal adhesion; kinetochore; nucleoplasm; Z disc

Molecular Function: enzyme inhibitor activity; phosphatase regulator activity; protein binding; protein kinase binding

Biological Process: centrosome cycle; G2/M transition of mitotic cell cycle; mitotic cell cycle; negative regulation of catalytic activity; positive regulation of transcription from RNA polymerase II promoter; protein amino acid dephosphorylation; regulation of cell adhesion