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PubMed · 53153

Localisation by immunological techniques of myosin in nuclei of lower eurkaryotes.

M Hauser·G Beinbrech·U Gröschel-Stewart·B M Jockusch
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ActomyosinCell DivisionCell NucleolusCell NucleusCiliophoraCytoplasmEpitopesFluorescent Antibody TechniqueMyosinsMyxomycetesPhysarumSpecies SpecificityComparative StudyJournal Article

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M Hauser, G Beinbrech, U Gröschel-Stewart, B M Jockusch. 1975-10-01. Localisation by immunological techniques of myosin in nuclei of lower eurkaryotes.. https://doi.org/10.1016/0014-4827(75)90617-5

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Adenosine 3':5'-monophosphate-mediated inhibition of myosin light chain phosphorylation in bovine aortic actomyosin.

Ca2+-dependent phosphorylation of the myosin light chains in bovine aortic native actomyosin is markedly depressed in the presence of cyclic AMP and its dependent protein kinase. This inhibition occurs with either cardiac, skeletal, or aortic protein kinase plus cyclic AMP, while little or no inhibition occurs with either cyclic AMP or protein kinase alone. The extent of inhibition is related to the concentration of protein kinase and approaches a maximum of approximately 50%. Concomitant with the inhibition of myosin light chain phosphorylation is (a) an increased phosphorylation of a 100,000-dalton moiety which possibly corresponds to the myosin light chain kinase present in the native actomyosin preparation and (b) a decrease in the actomyosin Mg2+-ATPase activity. These findings suggest that modulation of actin-myosin interactions by the cAMP system directly at the level of the contractile proteins may represent a mechanism by which beta adrenergic relaxation occurs in mammalian vascular smooth muscle.

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