Alkyl hydroperoxide reductase from Salmonella typhimurium. Sequence and homology to thioredoxin reductase and other flavoprotein disulfide oxidoreductases.
نویسندگان
چکیده
منابع مشابه
Flavin-dependent alkyl hydroperoxide reductase from Salmonella typhimurium. 1. Purification and enzymatic activities of overexpressed AhpF and AhpC proteins.
The two components, AhpF and AhpC, of the Salmonella typhimurium alkyl hydroperoxide reductase enzyme system have been overexpressed and purified from Escherichia coli for investigations of their catalytic properties. Recombinant proteins were isolated in high yield (25-33 mg per liter of bacterial culture) and were shown to impart a high degree of protection against killing by cumene hydropero...
متن کاملCloning of a Corynebacterium diphtheriae iron-repressible gene that shares sequence homology with the AhpC subunit of alkyl hydroperoxide reductase of Salmonella typhimurium.
To understand how Corynebacterium diphtheriae responds to iron limitation, we compared the sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) protein profiles of both wild-type cells and iron uptake mutants grown in either high- or low-iron medium. The removal of iron by ethylene diamine di-(o-hydroxy-phenyl acetic acid) from the growth medium of wild-type cells resulted in in...
متن کاملRoles for the two cysteine residues of AhpC in catalysis of peroxide reduction by alkyl hydroperoxide reductase from Salmonella typhimurium.
The catalytic properties of cysteine residues Cys46 and Cys165, which form intersubunit disulfide bonds in the peroxidatic AhpC protein of the alkyl hydroperoxide reductase (AhpR) system from Salmonella typhimurium, have been investigated. The AhpR system, composed of AhpC and a flavoprotein reductase, AhpF, catalyzes the pyridine nucleotide-dependent reduction of organic hydroperoxides and hyd...
متن کاملFlavin-dependent alkyl hydroperoxide reductase from Salmonella typhimurium. 2. Cystine disulfides involved in catalysis of peroxide reduction.
The two-component alkyl hydroperoxide reductase enzyme system from Salmonella typhimurium catalyzes the pyridine nucleotide-dependent reduction of alkyl hydroperoxide and hydrogen peroxide substrates. This system is composed of a flavoenzyme, AhpF, which is related to the disulfide-reducing enzyme thioredoxin reductase, and a smaller protein, AhpC, which lacks a chromophoric cofactor. We have d...
متن کاملAn alkyl hydroperoxide reductase induced by oxidative stress in Salmonella typhimurium and Escherichia coli: genetic characterization and cloning of ahp.
The ahp genes encoding the two proteins (F52a and C22) that make up an alkyl hydroperoxide reductase were mapped and cloned from Salmonella typhimurium and Escherichia coli. Two classes of oxidant-resistant ahp mutants which overexpress the two proteins were isolated. ahp-1 was isolated in a wild-type background and is dependent on oxyR, a positive regulator of defenses against oxidative stress...
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ژورنال
عنوان ژورنال: Journal of Biological Chemistry
سال: 1990
ISSN: 0021-9258
DOI: 10.1016/s0021-9258(18)86980-0