Localization of Cys133 of rabbit skeletal troponin-I with respect to troponin-C by resonance energy transfer.
Localization of Cys133 of rabbit skeletal troponin-I with respect to troponin-C by resonance energy transfer.
复制标题
通过共振能量转移对兔骨骼肌钙蛋白-I 的 Cys133 相对于肌钙蛋白-C 进行定位。
DOI:
10.1016/s0006-3495(98)78017-8
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发表时间:
1998
影响因子:
3.4
通讯作者:
Tao,T
中科院分区:
文献类型:
--
作者:
Luo,Y;Wu,JL;Gergely,J;Tao,T
We have used the technique of resonance energy transfer in conjunction with distance geometry analysis to localize Cys133of troponin-I (TnI) with respect to troponin-C (TnC) in the ternary troponin complex and the binary TnC·TnI complex in the presence and absence of Ca2+. Cys133of TnI was chosen because our previous work has shown that the region of TnI containing this residue undergoes Ca2+-dependent movements between actin and TnC, and may play an important role in the regulatory function of troponin. For this purpose, a TnI mutant with a single Cys at position 133, and TnC mutants, each with a single Cys at positions 5, 12, 21, 41, 49, 89, 98, 133, and 158, were constructed by site-directed mutagenesis. The distances between TnI Cys133and each of the nine residues in TnC were then measured. Using a least-squares minimization procedure, we determined the position of TnI Cys133in the coordinate system of the crystal structure of TnC. Our results show that in the presence of Ca2+, TnI Cys133is located near residue 12 beneath the N-terminal lobe of TnC, and moves away by 12.6Å upon the removal of Ca2+. TnI Cys133and the region of TnC that undergoes major change in conformation in response to Ca2+are located roughly on opposite sides of TnC's central helix. This suggests that the region in TnI that undergoes Ca2+-dependent interaction with TnC is distinct from that interacting with actin.
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影响因子:
3.4
作者:
M. Kekic;W. Huang;P. D. Moens;B. Hambly;C. D. dos Remedios
通讯作者:
C. D. dos Remedios
影响因子:
5.6
作者:
Wang,CK;Cheung,HC
通讯作者:
Cheung,HC
DOI:
--
发表时间:
1984
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Perkins,WJ;Weiel,J;Grammer,J;Yount,RG
通讯作者:
Yount,RG
DOI:
10.1126/science.3969570
发表时间:
1985
期刊:
Science (New York, N.Y.)
影响因子:
--
作者:
Sundaralingam,M;Bergstrom,R;Strasburg,G;Rao,ST;Roychowdhury,P;Greaser,M;Wang,BC
通讯作者:
Wang,BC
影响因子:
--
作者:
R. Fairclough;C. Cantor
通讯作者:
C. Cantor