Recent Advances in Medicinal Chemistry

Volume: 1

Indexed in: Book Citation Index, Science Edition; BIOSIS Previews, EBSCO.

Recent advances in Medicinal Chemistry is a book series focused on leading-edge research on developments in rational drug design, synthetic chemistry, bioorganic chemistry, high-throughput screening, ...
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Updated Report on a Novel Mercaptopyruvate Sulfurtransferase Thioredoxin-Dependent Redox-Sensing Molecular Switch: A Mechanism for the Maintenance of Cellular Redox Equilibrium

Pp. 56-72 (17)

Noriyuki Nagahara

Abstract

3-Mercaptopyruvate sulfurtransferase (MST, EC.2.8.1.2) has two thioredoxin-dependent redox-sensing switches for the regulation of the enzymatic activity. One is an intermolecular disulfide bond formed between two subunits: A cysteine residue on the surface of each subunit was oxidized to form an intersubunit disulfide bond so as to decrease MST activity, and thioredoxin-specific conversion of a dimer to a monomer increased MST activity. Another switch is a catalytic site cysteine, which reversibly forms a low redox potential sulfenate so as to inhibit MST, and thioredoxin-dependent reduction of the sulfenate restored the MST activity. Concludingly, MST partly contributes to the maintenance of cellular redox homeostasis via exerting control over cysteine catabolism. This report is an updated version of the previous review [1] with small modifications.

Keywords:

Atmospheric oxygen, antioxidative stress, intermolecular disulfide bond, mercaptolactate-cysteine disulfiduria, mercaptopyruvate sulfurtransferase, molecular evolution, redox-sensing switch, thioredoxin.

Affiliation:

Department of Environmental Medicine, Nippon Medical School, 1-1-5 Sendagi Bunkyo-ku, Tokyo 113-8602, Japan.