Redox regulation and trapping sulfenic acid in the peroxide-sensitive human mitochondrial branched chain aminotransferase

Hutson, S. M., Poole, L. B., Coles, S. and Conway, M. E. (2009) Redox regulation and trapping sulfenic acid in the peroxide-sensitive human mitochondrial branched chain aminotransferase. In: (2009) Redox-Mediated Signal Transduction. (Volume) Humana Press (Springer Imprint), pp. 135-148. ISBN 978-1-58829-842-3

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Publisher's URL: http://dx.doi.org/10.1007/978-1-59745-129-1_10

Abstract

The human branched chain aminotransferase enzymes are key regulators of glutamate metabolism in the brain and are among a growing number of redox-sensitive proteins. Studies that use thiol-specific reagents and electrospray ionization mass spectrometry demonstrate that the mitochondrial BCAT enzyme has a redox-active CXXC center, which on oxidation forms a disulfide bond (RSSR), via a cysteine sulfenic acid intermediate. Mechanistic details of this redox regulation were revealed by the use of mass spectrometry and dimedone modification. We discovered that the thiol group at position C315 of the CXXC motif acts a redox sensor, whereas the thiol group at position C318 permits reversible regulation by forming an intrasubunit disulphide bond. Because of their roles in redox regulation and catalysis, there is a growing interest in cysteine sulphenic acids. Therefore, development of chemical tags/methods to trap these transient intermediates is of immense importance.

Item Type:Book Section
Uncontrolled Keywords:CXXC motif, oxidation, sulphenic acid, dimedone, mass spectrometry
Faculty/Department:Faculty of Health and Applied Sciences > Department of Biological, Biomedical and Analytical Sciences
ID Code:7936
Deposited By: K. Steeden
Deposited On:17 Jun 2010 14:08
Last Modified:12 Aug 2013 08:00

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