Regulation of Escherichia coli pyrC by the purine regulon repressor protein.
AUTOR(ES)
Choi, K Y
RESUMO
The purine regulon repressor, PurR, was identified as a component of the Escherichia coli regulatory system for pyrC, the gene that encodes dihydroorotase, an enzyme in de novo pyrimidine nucleotide synthesis. PurR binds to a pyrC control site that resembles a pur regulon operator and represses expression by twofold. Mutations that increase binding of PurR to the control site in vitro concomitantly increase in vivo regulation. There are completely independent mechanisms for regulation of pyrC by purine and pyrimidine nucleotides. Cross pathway regulation of pyrC by PurR may provide one mechanism to coordinate synthesis of purine and pyrimidine nucleotides.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=209125Documentos Relacionados
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