甲壳动物横纹肌肌原纤维的肌丝陈列,收缩蛋白质和收缩的Ca2+依赖性调节机制与脊椎动物横纹肌有不少差异.脊椎动物横纹肌、甲壳动物快肌与慢肌的粗丝与细丝的数量比依次为1:2,1:3和1:6,肌丝阵列各异.甲壳动物粗肌丝由肌球蛋白和副肌球蛋白组成,其分子装配与脊椎动物不同.细肌丝含有肌动蛋白、原肌球蛋白和肌钙蛋白,肌钙蛋白-T分子量较高,肌钙蛋白-C仅1个Ca2+结合位点.甲壳动物横纹肌兼有细肌丝调节与粗肌丝调节.
Myofilament arrangement,contractile proteins, and Ca2+-dependent regulatory mechanisms between the crustacean and vertebrate striated muscles are different. The ratios of the thick to thin myofilament of vertebrate striated, crustacean fast and slow muscles are 1:2,1:3 and 1:6 respectively, as well as the myofilament arrangement also differ from one another.The molecular assembly of the crustacean thick myofilament composes of myosin and paramyosin are differ from that of the vertebrate striated muscle.The thin myofilament comprises actin, tropomyosin, and troponin. The molecular weight of troponin T is relatively high, and troponin C has only single Ca2+-binding site. The thin and thick myofilament regulatory mechanisms coexist in the crustacean striated muscle.
陈明,钟咏梅.甲壳动物横纹肌的收缩蛋白质与调节机制[J].生物化学与生物物理进展,1994,21(3):200-203
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