UNSPECIFIED (1998) Electrochemistry of Paracoccus versutus cytochrome c(552.5) adsorbed on a glassy carbon electrode. BIOELECTROCHEMISTRY AND BIOENERGETICS, 45 (2). pp. 293-297. ISSN 0302-4598

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Abstract

Paracoccus versutus cytochrome c(552.5) represents one of the major components of a thiosulphate-oxidizing multienzyme system (TOMES). In this investigation, the electrochemical behaviour of cytochrome c(552.5) adsorbed on a glassy carbon electrode has been studied by cyclic voltammetry at pH 7.0, at 20 degrees C. The electron transfer process was found to be irreversible for scan rates above 0.1 V s(-1), with alpha = 1.06, a heterogeneous rate constant of k(s) = 0.45 s(-1), and a standard redox potential of E-0 = + 250 mV (vs. SHE). The redox process was found to involve the transfer of two electrons and a single proton at pH 7.0. Deadsorption of cytochrome c(552.5) from the electrode was investigated by chronocoulometry at pH 7.0 and 200 mV (vs. SCE), and found to be diffusion-controlled. A surface concentration of 2 X 10(-11) mol cytochrome c(552.5) cm(-2) was determined at the start of deadsorption, with an adsorption constant of (beta similar to 10(6) M-1 and a maximum surface concentration of 5 x 10(-11) moles cytochrome c(552.5) cm(-2). (C) 1998 Elsevier Science S.A. All rights reserved.

Item Type:	Journal Article
Subjects:	Q Science > QD Chemistry Q Science > QH Natural history > QH301 Biology
Journal or Publication Title:	BIOELECTROCHEMISTRY AND BIOENERGETICS
Publisher:	ELSEVIER SCIENCE SA
ISSN:	0302-4598
Date:	May 1998
Volume:	45
Number:	2
Number of Pages:	5
Page Range:	pp. 293-297
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/15571

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