首页 | 本学科首页   官方微博 | 高级检索  
   检索      


Studies on the subunit interactions of skeletal muscle myosin subfragment 1. Evidence for subunit exchange between isozymes under physiological ionic strength and temperature
Authors:M Sivaramakrishnan  M Burke
Abstract:Evidence is presented that under physiological conditions of ionic strength and temperature, where myosin Subfragment 1 is hydrolyzing MgATP, the interaction between its subunits is extremely labile. Incubation of 3H]N-ethylmaleimide-SF1(A1) with N-ethylmaleimide-SF1(A2) in the presence of 10 mM MgATP at 37 degrees C resulted in the exchange of subunits between these isozymes. This is readily discernible from the subunit composition and distribution of the 3H label after separation of the isozymes by ion exchange chromatography. Moreover, incubation of unmodified SF1(A1) or SF1(A2) with the free Alkali light chains A2 and A1, respectively, under the same conditions led to the formation of significant amounts of the hybrid species. These findings suggest that in vivo the Alkali light chain-heavy chain interaction of Subfragment 1 is in a state of dynamic equilibrium between associated and dissociated states.
Keywords:
本文献已被 PubMed 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号