Metals and activity of bovine heart cytochrome c oxidase are independent of polypeptide subunits III, VII, a, and b.

Abstract:

:Bovine heart cytochrome c oxidase, depleted of polypeptide subunits by alkaline detergent treatment, was characterized with respect to metal content, optical spectral properties, and oxidase activity. Treatment with 1.0% Triton X-100 at pH 9.5 followed by anion-exchange chromatography caused removal of subunit III, subunit VII, and polypeptides a and b. The metal atom stoichiometries of the control and the polypeptide-depleted enzyme were in both cases 2.5Cu/2Fe/1Zn/1Mg with metal-to-protein ratios significantly greater in the latter. The treated enzyme exhibited a red shifted oxidized Soret maximum and bound carbon monoxide upon reduction. Activity was markedly decreased by the treatment but was restored to control levels by incubation with 0.3% Tween 80 at pH 6.0. Therefore, subunit III, subunit VII, polypeptide a, and polypeptide b do not contain Cu, Fe, Zn, or Mg and are not essential for reduction of O2 by ferrocytochrome c.

authors

Yewey GL,Caughey WS

doi

10.1016/s0006-291x(87)80304-2

subject

Has Abstract

pub_date

1987-11-13 00:00:00

pages

1520-6

issue

3

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(87)80304-2

journal_volume

148

pub_type

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