ArticleThe Journal of biological chemistry2011
MYPT1 protein isoforms are differentially phosphorylated by protein kinase G.
Article in The Journal of biological chemistry, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 26 papers.
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Who cites it
26 citing papers in PubMed, 43 citations in OpenAlex.
- IsoProDB: an integrated map of human protein isoforms for accelerated research.Database : the journal of biological databases and curation · 2026Article
- Unresolved mechanisms: a hypothesized spatial regulation of myosin light chain phosphorylation within the walls of resistance arteries.Frontiers in physiology · 2026Article
- MBNL loss of function in smooth muscle as a model for myotonic dystrophy associated gastrointestinal dysmotility.Proceedings of the National Academy of Sciences of the United States of America · 2025Article
- Aging related decreases in NM myosin expression and contractility in a resistance vessel.Frontiers in physiology · 2024Article
- Dual thick and thin filament linked regulation of stretch- and L-NAME-induced tone in young and senescent murine basilar artery.Frontiers in physiology · 2023Article
- Complex Transcriptional Profiles of theCells · 2022Article
- Statins change the cytokine profile inFrontiers in immunology · 2022Article
- The vasculature in HFpEF vs HFrEF: differences in contractile protein expression produce distinct phenotypes.Heliyon · 2020Article
- p90 ribosomal S6 kinase (RSK) phosphorylates myosin phosphatase and thereby controls edge dynamics during cell migration.The Journal of biological chemistry · 2019Article
- Article
- Oxidation of cysteine 117 stimulates constitutive activation of the type Iα cGMP-dependent protein kinase.The Journal of biological chemistry · 2018Article
- Expression of MYPT1, CPI-17 and MLC20 in ileum of neonatal mouse NEC model and its significance.Experimental and therapeutic medicine · 2017Article
- Unfair competition governs the interaction of pCPI-17 with myosin phosphatase (PP1-MYPT1).eLife · 2017Article
- Regulation of Pulmonary Vascular Smooth Muscle Contractility in Pulmonary Arterial Hypertension: Implications for Therapy.Frontiers in physiology · 2017Review
- Vascular smooth muscle cell contractile protein expression is increased through protein kinase G-dependent and -independent pathways by glucose-6-phosphate dehydrogenase inhibition and deficiency.American journal of physiology. Heart and circulatory physiology · 2016Article
- Mechanisms of Vascular Smooth Muscle Contraction and the Basis for Pharmacologic Treatment of Smooth Muscle Disorders.Pharmacological reviews · 2016Review
- MYPT1 isoforms expressed in HEK293T cells are differentially phosphorylated after GTPγS treatment.Journal of smooth muscle research = Nihon Heikatsukin Gakkai kikanshi · 2016Article
- In vivo roles for myosin phosphatase targeting subunit-1 phosphorylation sites T694 and T852 in bladder smooth muscle contraction.The Journal of physiology · 2015Article
- Reconstituted human myosin light chain phosphatase reveals distinct roles of two inhibitory phosphorylation sites of the regulatory subunit, MYPT1.Biochemistry · 2014Article
- Myosin phosphatase isoforms as determinants of smooth muscle contractile function and calcium sensitivity of force production.Microcirculation (New York, N.Y. : 1994) · 2014Review
Corrections and comments
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Authors and funding
3 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Smooth muscle relaxation in response to NO signaling is due, in part, to a Ca(2+)-independent activation of myosin light chain (MLC) phosphatase by protein kinase G Iα (PKGIα). MLC phosphatase is a trimeric complex of a 20-kDa subunit, a 38-kDa catalytic subunit, and a 110-133-kDa myosin-targeting subunit (MYPT1). Alternative mRNA splicing produces four MYPT1 isoforms, differing by the presence or absence of a central insert and leucine zipper (LZ). The LZ domain of MYPT1 has been shown to be important for PKGIα-mediated activation of MLC phosphatase activity, and changes in LZ+ MYPT1 isoform expression result in changes in the sensitivity of smooth muscle to NO-mediated relaxation. Furthermore, PKGIα has been demonstrated to phosphorylate Ser-694 of MYPT1, but phosphorylation at this site does not always accompany cGMP-mediated smooth muscle relaxation. This study was designed to determine whether MYPT1 isoforms are differentially phosphorylated by PKGIα. The results demonstrate that purified LZ+ MYPT1 fragments are rapidly phosphorylated by PKGIα at Ser-667 and Ser-694, whereas fragments lacking the LZ domain are poor PKGIα substrates. Mutation of Ser-667 and Ser-694 to Ala and/or Asp showed that Ser-667 phosphorylation is more rapid than Ser-694 phosphorylation, suggesting that Ser-667 may play an important role in the activation of MLC phosphatase. These results demonstrate that MYPT1 isoform expression is important for determining the heterogeneous response of vascular beds to NO and NO-based vasodilators, thereby playing a central role in the regulation of vascular tone in health and disease.
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