微丝相关蛋白HSPC300/hHBRK1与肌球蛋白Ⅵ相互作用位点的计算机预测

HSPC300/hHBRK1 蛋白作为BRK1 的人类同源蛋白,参与细胞运动和物质运输.肌球蛋白Ⅵ是肌球蛋白家族的成员.HSPC300/hHBRK1和肌球蛋白Ⅵ共同定位于细胞的胞浆,hHBRK1 可能通过与肌球蛋白Ⅵ相互作用,参与细胞内的物质运输.从结构角度出发,通过计算机模拟蛋白质间相互作用,预测二者作用区域,找出相关残基PHE43,LYS105,THR676和LEU40,即可能成为相互作用位点的重要残基,为进一步实验研究提供了重要信息.     

In vitro stability and protein composition of thick filaments from insect flight muscles

Thick and thin filaments of synchronous and asynchronous insect flight muscles were separated by density gradient centrifugation. A good release of myofilaments from myofibrils was obtained by sonication of myofibrils in relaxing solution with pH 6.1 (locust), pH 6.4 (honeybee) and pH 6.6 (fleshfly), respectively. Thick filaments but not thin filaments were dissolved, if sucrose gradient centrifugation was used to separate the filaments. Thus, sucrose gradients are the medium of choice if actin filaments are to be purified. Glycerol-containing gradients selectively dissolved myosin filaments from fleshfly muscles. The stability of the myosin filaments of all muscles was sufficient in gradients with 10–30% formamide.     

Intramuscular comparison of myosin isozymes and light chains in rat extensor digitorum longus muscle

Summary Complete muscle cross sections were obtained from the proximal and distal third regions of ten rat extensor digitorum longus muscles. Electrophoretic methods were then used to quantify the various myosin isozymes and light chains in each muscle specimen. The results demonstrated that the relative distribution of the various myosin isozyme and light chain variables do not vary significantly between the two sampling regions.     

SHR肾脏组织肌球蛋白轻链磷酸酶水平的研究

通过比较12周龄的自发性高血压大鼠（spontaneously hypertensive rat,SHR）及其对照组Wistar Kyoto（WKY）肾脏组织的MLCP的130、38、21kD三个亚单位含量差异,探讨肾脏组织MLCP与SHR高血压病理机制之间的关系。在4℃的环境下,取SHR与WKY大鼠各10只断头处死,迅速取其肾脏,称重速冻后将血管磨成匀浆,置于缓冲液中并通过离心提取蛋白质,校正两组总蛋白的浓度后,分别应用SDS-PAGE、Western印迹杂交和化学发光的方法测定SHR与WKY肾脏组织MLCP的130、38、21kD三个亚单位的含量,对显影结果进一步进行吸光度扫描分析。进行两组间,t检验。发现SHR和WKY大鼠肾脏组织MLCP的130、38和21kD三个亚单位的含量有着明显的差异,SHR的MLCP38和21kD亚单位的含量明显低于WKY大鼠（p〈0·01）,SHR的MLCP130kD亚单位含量则高于WKY大鼠（p〈0·05）。提示肾脏组织MLCP结构或功能的异常可能与SHR高血压的病理机制有关。