Binding of lanthanide ions to troponin C.

Binding of lanthanide ions to troponin C.
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镧系元素离子与肌钙蛋白的结合 C.

DOI:
10.1021/bi00512a012
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发表时间:
1981
期刊:
影响因子:
2.9
通讯作者:
Gergely,J
Gergely,J
中科院分区:
生物学3区
文献类型:
--
作者:
Wang,CL;Leavis,PC;HorrocksJr,WD;Gergely,J

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Chih-Lueh A. Wang, Paul C. Leavis, W. DeW. Horrocks, Jr., and J. Gergely* abstract: Tb3+ and Eu3+ bound to troponin C were detected by (1) changes in the fluorescence of the tyrosine chromophore of the protein or (2) the luminescence of the ions themselves excited by energy transfer from the protein or by direct ex-citation using a pulsed laser light source [Horrocks, W. DeW., Jr., & Sudnick, DR (1979) Science (Washington, DC) 206, 1194-1196], Titrations carried out in the absence and presence of Ca2+ suggesttwo classes of binding sites (two sites in each class) for the lanthanides, corresponding to the high-and theTroponin C (TnC), 1 the Ca2+-binding subunit of the troponin complex from mammalian skeletal muscle, contains four Ca2+-binding sites (numbered from I to IV from the N terminus), each of which comprises ten amino acid residues, with at least four containing carboxylate groups that serve as Ca2+-coordinating ligands (Collins et al., 1973). Two of these sites, sites III and IV, bind Ca2+ with a higher affinity (A'1Ca= 2 X 107 M'1) and also bind Mg2+(the Ca2+-Mg2+ sites), and sites I and II apparently only bind Ca2+(the Ca2+-specific
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