Interaction of the Second Binding Region of Troponin I with the Regulatory Domain of Skeletal Muscle Troponin C as Determined by NMR Spectroscopy*
Interaction of the Second Binding Region of Troponin I with the Regulatory Domain of Skeletal Muscle Troponin C as Determined by NMR Spectroscopy*
复制标题
通过 NMR 波谱测定肌钙蛋白 I 第二结合区与骨骼肌肌钙蛋白 C 调节域的相互作用*
DOI:
10.1074/jbc.272.45.28494
复制
发表时间:
1997
期刊:
影响因子:
--
通讯作者:
B. Sykes
中科院分区:
文献类型:
--
作者:
R. McKay;B. Tripet;R. Hodges;B. Sykes
Two dimensional1H,15N-heteronuclear single quantum correlation NMR was used to monitor the resonance frequency changes of the backbone amide groups belonging to the 15N-labeled regulatory domain of calcium saturated troponin C (N-TnC) upon addition of synthetic skeletal N-acetyl-troponin I 115–131-amide peptide (TnI115–131). Utilizing the change in amide chemical shifts, the dissociation constant for 1:1 binding of TnI115–131 to N-TnC in low salt and 100 mm KCl samples was determined to be 28 ± 4 and 24 ± 4 μm, respectively. The off rate of TnI115–131 was determined to be 300 s−1 from observed N-TnC backbone amide1H,15N-heteronuclear single quantum correlation cross-peak line widths, which is on the order of the calcium off rates (Li, M. X., Gagné, S. M., Tsuda, S., Kay, C. M., Smillie, L. B., and Sykes, B. D. (1995) Biochemistry34, 8330–8340), and agrees with kinetic expectations for biological regulation of muscle contraction. The TnI115–131 binding site on N-TnC was determined by mapping of chemical shift changes onto the N-TnC NMR structure and was demonstrated to be in the “hydrophobic pocket” (Gagné, S. M., Tsuda, S., Li, M. X., Smillie, L. B., and Sykes, B. D. (1995) Nat. Struct. Biol. 2, 784–789).
登录
查看更多内容
影响因子:
2.9
作者:
Kobayashi,T;Grabarek,Z;Gergely,J;Collins,JH
通讯作者:
Collins,JH
DOI:
10.1073/pnas.92.23.10644
发表时间:
1995-11-07
影响因子:
11.1
作者:
HOUDUSSE, A;COHEN, C
通讯作者:
COHEN, C
影响因子:
2.9
作者:
Olah,GA;Trewhella,J
通讯作者:
Trewhella,J
影响因子:
2.9
作者:
Leszyk,J;Grabarek,Z;Gergely,J;Collins,JH
通讯作者:
Collins,JH
影响因子:
2.9
作者:
Olah,GA;Rokop,SE;Wang,CL;Blechner,SL;Trewhella,J
通讯作者:
Trewhella,J