Static and kinetic studies on rabbit skeletal muscle troponin.

Abstract:

:Fluorescence titration curves of 2-[4'-iodoacetamido)anilino)naphthalene-6-sulfonic acid-labeled troponin (IAANS-labeled Tn) and troponin-1-anilinonaphthalene-8-sulfonic acid (Tn-ANS) complex indicated that the fluorescent moiety, IAANS or ANS, detects conformational change of troponin I (TnI) or Tn due to the Ca2+ binding or removal reaction with the low affinity Ca2+-binding sites of troponin C (TnC) component. A fluorescence stopped-flow study showed that the kinetic behavior of IAANS-labeled Tn reflects a change in state of the TnI component induced by the Ca2+ binding or removal reaction with the low affinity Ca2+-binding sites of TnC component. The state change of TnI induced by the Ca2+ binding was complete within the instrumental dead time. On the other hand, that induced by the Ca2+ removal had a rate constant of around 13 s-1. ANS, which is noncovalently bound to Tn, reflects the kinetic properties of both the TnI component and the low affinity Ca2+-binding region of TnC component. The fluorescence intensity change of ANS induced by Ca2+ binding to the low affinity Ca2+-binding sites of TnC was complete within the instrumental dead time, while that induced by the Ca2+ removal from the same sites was biphasic. The rate constants of the biphasic process were found to be 62 +/- 7 s-1 and 16 +/- 4 s-1. The former value corresponds to the rate constant of the Ca2+ removal reaction from the low affinity Ca2+-binding sites of TnC component, and the latter value to the rate constant observed in the case of IAANS-labeled Tn. Based on these experimental results and on the discussion in our previous paper (Iio, T. & Kondo, H. (1981) J. Biochem. 90, 163-175), we have refined the two-way information-transfer mechanism which we previously proposed in order to explain the biological function of Tn.

journal_name

J Biochem

journal_title

Journal of biochemistry

authors

Nishio T,Iio T

doi

10.1093/oxfordjournals.jbchem.a134415

subject

Has Abstract

pub_date

1983-09-01 00:00:00

pages

745-54

issue

3

eissn

0021-924X

issn

1756-2651

journal_volume

94

pub_type

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