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Steady-state kinetic analysis of substrate pair cycling between two enzymes: application to a mediated electron transport between the cytoplasmic membrane and the periplasmic nitrite reductase of Paracoccus denitrificans by Igor Kučera; Michal Kuňák is a Biochemistry, Genetics and Molecular Biology article available to read on EtoBox.

What is Steady-state kinetic analysis of substrate pair cycling between two enzymes: application to a mediated electron transport between the cytoplasmic membrane and the periplasmic nitrite reductase of Paracoccus denitrificans about?

An extended kinetic model is presented for the process catalysed by two enzymes mutually connected by the cycling of two reversibly interconvertible chemically relative species. Expressions are derived for the steady-state velocity, limiting velocity (V) and the half-saturation concentration of the cycling substrate (A(0.5)). It is shown that the velocity depends on the total concentration of cycling substrate hyperbolically if both enzymes have equal activities. Based on these theoretical considerations, an experimental comparison was made between pseudoazurin and cytochrome c(550) as physiological electron transfer mediators for nitrite reduction in an in vitro reconstituted part of the respiratory chain of Paracoccus denitrificans. Pseudoazurin exhibited 1.7-fold higher V and 14-fold higher A(0.5) than cytochrome c(550) under the experimental conditions used (20 mM Tris chloride, pH 7.3, 30 degrees C).

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Author

Igor Kučera; Michal Kuňák

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0301-4622)

Published

2003

Language

EN

Field

Biochemistry, Genetics and Molecular Biology (Life Sciences)