Linked Life Data

9286981

Source:http://linkedlifedata.com/resource/pubmed/id/9286981

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pubmed-article:9286981pubmed:abstractTextPseudomonas aeruginosa ArgR, a regulatory protein that plays a major role in the control of certain biosynthetic and catabolic arginine genes, was purified to homogeneity. ArgR was shown to be a dimer of two equal subunits, each with a molecular mass of 37,000 Da. Determination of the amino-terminal amino acid sequence showed it to be identical to that predicted from the derived sequence for the argR gene. DNase I footprinting showed that ArgR protects a region of 45 to 47 bp that overlaps the promoters for the biosynthetic car and argF operons, indicating that ArgR exerts its negative control on the expression of these operons by steric hindrance. Studies were also carried out with the aru operon, which encodes enzymes of the catabolic arginine succinyl-transferase pathway. Quantitative S1 nuclease experiments showed that expression of the first gene in this operon, aruC, is initiated from an arginine-inducible promoter. Studies with an aruC::lacZ fusion showed that this promoter is under the control of ArgR. DNase I experiments indicated that ArgR protects two 45-bp binding sites upstream of aruC; the 3' terminus for the downstream binding site overlaps the -35 region for the identified promoter. Gel retardation experiments yielded apparent dissociation constants of 2.5 x 10(-11), 4.2 x 10(-12), and 7.2 x 10(-11) M for carA, argF, and aruC operators, respectively. Premethylation interference and depurination experiments with the car and argF operators identified a common sequence, 5'-TGTCGC-3', which may be important for ArgR binding. Alignment of ArgR binding sites reveals that the ArgR binding site consists of two half-sites, in a direct repeat arrangement, with the consensus sequence TGTCGCN8AAN5.lld:pubmed
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pubmed-article:9286981pubmed:articleTitlePurification and characterization of an arginine regulatory protein, ArgR, from Pseudomonas aeruginosa and its interactions with the control regions for the car, argF, and aru operons.lld:pubmed
pubmed-article:9286981pubmed:affiliationDepartment of Biology, Georgia State University, Atlanta 30303, USA.lld:pubmed
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pubmed-article:9286981pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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