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Enthalpy, entropy and heat capacity changes induced by binding of calcium ions to cardiac troponin C.

Abstract：

:Microcalorimetric titrations have been used to study the binding of Ca2+ to cardiac troponin C. Measurements were made both in the presence and in the absence of Mg2+, and at temperatures of 5 degrees, 15 degrees and 25 degrees C. Changes in enthalpy, entropy and heat capacity of troponin C associated with Ca binding have been determined. Cardiac troponin C exhibited a decrease in enthalpy and an increase in entropy associated with Ca binding. Enthalpy changes increased linearly with temperature, indicating that the Ca binding causes negative changes in the heat capacity of troponin C. These results show that the Ca binding causes a strong hydrophobic effect and a tightening of the molecular structure of cardiac troponin C.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Kometani K,Yamada K

doi

10.1016/0006-291x(83)91608-x

subject

Has Abstract

pub_date

1983-07-18 00:00:00

pages

162-7

issue

1

eissn

0006-291X

issn

1090-2104

pii

0006-291X(83)91608-X

journal_volume

114

pub_type

杂志文章

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