ELECTRON-TRANSFER SELF-EXCHANGE KINETICS OF TRIMETHYLPHOSPHINE HORSE-HEART MYOGLOBIN

被引：11

作者：

BRUNEL, C ^{[1
]}

BONDON, A ^{[1
]}

SIMONNEAUX, G ^{[1
]}

机构：

[1] UNIV RENNES 1, CHIM ORGANOMETALL & BIOL LAB,CNRS,URA 415, CAMPUS BEAULIEU, F-35010 RENNES, FRANCE

来源：

BIOCHIMICA ET BIOPHYSICA ACTA | 1992年 / 1101卷 / 01期

关键词：

ELECTRON TRANSFER; TRIMETHYLPHOSPHINE; MYOGLOBIN;

D O I：

10.1016/0167-4838(92)90469-T

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：

Electron self-exchange has been measured by an NMR technique for horse-heart myoglobin. The rate is 3.1 . 10(3) M-1 s-1 at 23-degrees-C in 0.1 M phosphate at pH 6.9. The rate was weakly dependent on ionic strength up to 0.7 M in added KCl (3.9 . 10(3) M-1 s-1). The enthalpy of activation was 12.1 +/- 0.5 kcal mol-1, and the entropy of activation was -1.2 +/- 0.5 cal mol-1 deg-1. Analysis of the data in terms of the Marcus theory gives a reorganization energy, lambda, for self-exchange of 1.6 eV mol-1.

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页码：73 / 78

页数：6

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