Switching of troponin I: Ca(2+) and myosin-induced activation of heart muscle.
Switching of troponin I: Ca(2+) and myosin-induced activation of heart muscle.
复制标题
肌钙蛋白 I 的转换:Ca(2 ) 和肌球蛋白诱导的心肌激活。
DOI:
10.1016/j.jmb.2004.04.046
复制
发表时间:
2004
影响因子:
5.6
通讯作者:
Cheung,HerbertC
中科院分区:
文献类型:
--
作者:
Robinson,JohnM;Dong,Wen-Ji;Xing,Jun;Cheung,HerbertC
The principal task of the Ca2+activation of striated muscle is the release of the troponin I (TnI) inhibitory region (TnI-I) from actin. TnI-I release facilitates the repositioning of tropomyosin across the actin surface and the formation of strong, force generating, actin-myosin cross-bridges. Full activation of the Ca2+regulatory switch (CRS) requires two switching steps in cTnI: binding of the TnI regulatory region to hydrophobic sites in the N-domain of Ca2+-bound troponin C and release of the adjacent TnI-I from actin. Using Förster resonance energy transfer, we have examined the requirements for full activation of the cardiac CRS. In the presence of actin, both Ca2+and strong cross-bridges are required for full activation. Actin desensitizes the CRS to Ca2+and produces cooperativity in the Ca2+activation of the CRS. Strong cross-bridges eliminate cooperativity and re-sensitize the CRS to Ca2+. We propose a kinetic scheme and a structural model to account for these findings.
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DOI:
10.1016/s0021-9258(17)43827-0
发表时间:
1983-12
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Z. Grabarek;J. Grabarek;Paul C. LeavisS;J. Gergely
通讯作者:
Z. Grabarek;J. Grabarek;Paul C. LeavisS;J. Gergely
影响因子:
--
作者:
Craig,Roger;Lehman,William
通讯作者:
Lehman,William
影响因子:
3.4
作者:
She,M;Dong,WJ;Umeda,PK;Cheung,HC
通讯作者:
Cheung,HC
影响因子:
5.6
作者:
Robinson,JohnM;Dong,Wen-Ji;Cheung,HerbertC
通讯作者:
Cheung,HerbertC
影响因子:
3.9
作者:
Xing,J;Cheung,HC
通讯作者:
Cheung,HC