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- W2022809785 abstract "Regulatory light chain of myosin II (MRLC) was identified as a novel substrate of p90 ribosomal S6 kinase (RSK)-2, a Ser/Thr protein kinase which is phosphorylated and activated by mitogen-activated protein kinase (MAPK) in vitro and in vivo. Phosphopeptide map of MRLC phosphorylated by RSK-2 was identical to that by myosin light chain kinase (MLCK). Phosphoserine was recovered by the phosphoamino acid analysis of MRLC phosphorylated by RSK-2. Further, phosphorylation using recombinant glutathione S-transferase (GST) fusion proteins of HeLa MRLC2 revealed that RSK-2 phosphorylated wild-type MRLC2 (GST-wtMRLC2) but not its mutants GST-MRLC2(S19A) or GST-MRLC2(T18AS19A) (alanine substituted for Ser19 or both Ser19 and Thr18). These results revealed that RSK-2 phosphorylates MRLC at Ser19 as did MLCK. Phosphorylation of myosin II by RSK-2 resulted in activation of actin-activated MgATPase activity of myosin II. Interestingly, RSK-2 activity to phosphorylate MRLC was suppressed by phosphorylation with MAPK. RSK-2 might be a mediator that regulates myosin II activity through the MAPK cascade." @default.
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- W2022809785 date "2000-09-01" @default.
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- W2022809785 title "Activation of Action-Activated MgATPase Activity of Myosin II by Phyosphorylation with MAPK-Activated Protein Kinase-1b (RSK-2)" @default.
- W2022809785 doi "https://doi.org/10.1093/oxfordjournals.jbchem.a022771" @default.
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