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p-T19,S20-MRLC-smooth muscle/non-muscle myosin II [cytosol]
Stable Identifier
R-BTA-5671947
Type
Complex
Species
Bos taurus
Compartment
cytosol
Synonyms
Phospho-activated smooth muscle/non-muscle myosin 2
General
Nonmuscle myosin II (NMM2) is an actin-based motor protein that plays a crucial role in a variety of cellular processes, including smooth muscle contraction, cell migration, polarity formation, and cytokinesis. NMM2 consists of two myosin heavy chains encoded by MYH9, MYH10, MYH14 (NMHC-IIA, B and C) or MYH11, two copies of MYL6 essential light chain protein, and two regulatory light chains (MRLCs), MYL9 and MYL12B. Myosin II activity is stimulated by phosphorylation of MRLC. Diphosphorylation at Thr-19 and Ser-20 (commonly referred in the literature as Thr-18 and Ser-19) increases both actin-activated Mg2+ ATPase activity and the stability of myosin II filaments; monophosphorylation at Ser-20 is less effective (Ikebe and Hartshorne 1985, Ikebe et al. 1988). Kinases responsible for the phosphorylation include myosin light chain kinase (MLCK), ROCK kinase, citron kinase, myotonic dystrophy kinase-related CDC42-binding protein kinase, and Zipper-interacting protein (ZIP) kinase. ROCK activity has been shown to regulate MRLC phosphorylation by directly mono- or diphosphorylating MRLC (Amano et al., 1996, Ueda et al., 2002, Watanabe et al. 2007).
Participants
components
x 2
MYL6 [cytosol]
(Bos taurus)
x 2
Phosphorylated smooth muscle/non-muscle myosin 2 regulatory light chains [cytosol]
(Bos taurus)
x 2
Smooth muscle/non-muscle myosin 2 heavy chains [cytosol]
(Bos taurus)
Participates
as an output of
Activated Cit phosphorylates MRLCs of myosin II complex (Bos taurus)
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