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- W189553755 abstract "Two putative myosin heavy chains designated SM1 and SM2 were detected on a 3.5% polyacrylamide-sodium dodecyl sulfate gel electrophoresis system loaded with homogenates of several mammalian smooth muscles. The two polypeptides were present in nearly equal amounts in all smooth muscle tissues tested and in myosin purified from swine carotid media and stomach. Both proteins were equally stained by smooth muscle-specific myosin antibodies. The smaller of the polypeptides had a mobility nearly identical to that of the single heavy chain observed in purified fast-twitch skeletal myosin. Electrophoresis of pyrophosphate extracts from swine carotid media, swine stomach, rabbit thoracic aorta, and guinea pig taenia coli on nondenaturing pyrophosphate gels revealed a single protein band. When subsequently electrophoresed on a sodium dodecyl sulfate gel, the native bands from swine tissue extracts revealed the two putative heavy chains in nearly equal amounts, as well as a large amount of a higher molecular weight peptide whose properties reflect those of filamen. Sodium dodecyl sulfate gel analysis of the myosin band from pyrophosphate gels of purified swine stomach myosin showed exclusively the two heavy chains in a nearly 1:1 ratio. Smooth muscle myosin migrates homogeneously on pyrophosphate gels, and the virtual equality of the two heavy chains may reflect the presence of large amounts of a myosin isoenzyme, which is a heavy-chain heterodimer." @default.
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- W189553755 date "1986-06-01" @default.
- W189553755 modified "2023-09-24" @default.
- W189553755 title "Two different heavy chains are found in smooth muscle myosin" @default.
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- W189553755 doi "https://doi.org/10.1152/ajpcell.1986.250.6.c861" @default.
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