Structural and functional studies on Troponin I and Troponin C interactions

被引:13
作者
Ngai, SM
Hodges, RS
机构
[1] Univ Alberta, Dept Biochem, Edmonton, AB T6G 2H7, Canada
[2] Univ Alberta, Med Res Council Canada, Grp Protein Struct & Funct, Edmonton, AB T6G 2H7, Canada
关键词
Troponin; TnI-TnC interaction; peptide;
D O I
10.1002/jcb.1204
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Troponin I (TnI) peptides (TnI inhibitory peptide residues 104-115, Ip; TnI regulatory peptide resides 1-30, TnI1-30), recombinant Troponin C (TnC) and Troponin I mutants were used to study the structural and functional relationship between TnI and TnC. Our results reveal that an intact central D/E helix in TnC is required to maintain the ability of TnC to release the TnI inhibition of the acto-S1-TMATPase activity. Ca2+-titration of the TnC-TnI1-30 complex was monitored by circular dichroism. The results show that binding of TnI 1-30 to TnC caused a three-folded increase in Ca2+ affinity in the high affinity sites (III and IV) of TnC. Gel electrophoresis and high performance liquid chromatography (HPLC) studies demonstrate that the sequences of the N- and C-terminal regions of TnI interact in an anti-parellel fashion with the corresponding N- and C-domain of TnC. Our results also indicate that the N- and C-terminal domains of TnI which flank the TnI inhibitory region (residues 104 to 115) play a vital role in modulating the Ca2+-sensitive release of the TnI inhibitory region by TnC within the muscle filament. A modified schematic diagram of the TnC/TnI interaction is proposed. J. Cell. Biochem. 83: 33-46, 2001. (C) 2001 Wiley-Liss, Inc.
引用
收藏
页码:33 / 46
页数:14
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