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Biochemical and biophysical studies on cytochromeaa3. VII. The effect of cytochromecon the oxidation-reduction potential of isolated cytochromeaa3

Authors
Journal
Biochimica et Biophysica Acta (BBA) - Bioenergetics
0005-2728
Publisher
Elsevier
Publication Date
Volume
267
Issue
1
Identifiers
DOI: 10.1016/0005-2728(72)90154-5

Abstract

Abstract 1. 1. In the absence of cytochrome c, the haem groups of cytochrome aa 3 titrate as indistinguishable identities, each having E′ o = 280 mV and n = 1. 2. 2. In the presence of cytochrome c, 45% of the absorbance change on reduction at 605 nm is due to a high-potential component with E′ o = 335–360 mV, n = 1.2 and 55% to a low-potential component with E′ o = 200–250 mV, n = 1.0. At 445 nm both components contribute equally to the difference spectrum (reduced minus oxidized).

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