Kinetics of structural changes in the relay loop and SH3 domain of myosin.
Kinetics of structural changes in the relay loop and SH3 domain of myosin.
复制标题
肌球蛋白中继环和 SH3 结构域结构变化的动力学。
DOI：
10.1016/j.bbrc.2005.01.152
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
Berger,ChristopherL
中科院分区：
文献类型：
--
作者：
vanDuffelen,Marilyn;Chrin,LynnR;Berger,ChristopherL
The intrinsic fluorescence of smooth muscle myosin signals conformational changes associated with different catalytic states of the ATPase cycle. To elucidate this relationship, we have examined the pre-steady-state kinetics of nucleotide binding, hydrolysis, and product release in motor domain-essential light chain mutants containing a single endogenous tryptophan, either residue 512 in the rigid relay loop or residue 29 adjacent to the SH3 domain. The intrinsic fluorescence of W512 is sensitive to both nucleotide binding and hydrolysis, and appears to report structural changes at the active site, presumably through a direct connection with switch II. The intrinsic fluorescence of W29 is sensitive to nucleotide binding but not hydrolysis, and does not appear to be tightly linked with structural changes occurring at the active site. We propose that the SH3 domain may be sensitive to conformational changes in the lever arm through contacts with the essential light chain.
