植物肌球蛋白的研究进展

Progress on Research of Plant Myosins

肌球蛋白是依赖微丝的、把贮存在ATP中的化学能转化为机械能的分子马达。它广泛存在于动、植物中 ,与信号传导、肌肉收缩、细胞器运动等有关。到现在为止 ,肌球蛋白分为两类 :传统肌球蛋白 (肌球蛋白Ⅱ )与非传统肌球蛋白。除肌球蛋白Ⅱ外 ,其余的都是非传统肌球蛋白 ,植物肌球蛋白为其中的第Ⅷ、Ⅺ、类。然而 ,赵发清博士从丝瓜卷须中鉴定出一肌球蛋白 (LFM1 74 ) ,其分子量为 1 74KDa,可能属于传统肌球蛋白。LFM1 74具两个头、一个长约为 1 0 0nm的尾 ,与肌球蛋白Ⅱ极为相似。不断出现的新技术将对肌球蛋白的研究产生影响。

Myosins are actin_based molecular motors that convert the chemical energy stored in ATP into mechanical force.There are evidences that myiosins exist in animals and plants.They relate with signal transduction,muscle contraction,organelle particle movement etc.By far,there are two kinds of myosins:conventional myosins and unconventional myosins.All myosins are unconventional myosins except MyosinⅡ.Among the unconventional myosins,the plant myosins contain the MyosinⅧ,Ⅺ,.However,Dr.Faqing Zhao had discovered a new myosin(LFM174) from plant Luffa cylindrica that molecular weight is 174KDa.LFM174 containing two heads and a 100 nm_long tail may be a conventional myosin for it is similar to myosin II in shape.Many new developing technologies will take effect on the studies of myosins.