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pubmed-article:8969519pubmed:abstractTextThe structural gene (purB) for succinyl-AMP (S-AMP) lyase and three additional ORFs are on the same DNA strand of the chromosome of Escherichia coli. Cassette mutagenesis and primer extension mapping demonstrated that purB is co-transcribed with an upstream gene (ORF23, or ycfC) encoding a 22.9 kDa membrane-associated protein of non-essential, but unknown, function unrelated to purine biosynthesis. The purB operon lies between phoP and an ORF expressing an essential function which may correspond to asuE (trmU). S-AMP lyase was purified to near homogeneity. The purified enzyme is a homotetramer of 50 kDa subunits, has a K(m) for S-AMP of 3.7 microM and a pH optimum of 7.4-7.6.lld:pubmed
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pubmed-article:8969519pubmed:articleTitleThe purB gene of Escherichia coli K-12 is located in an operon.lld:pubmed
pubmed-article:8969519pubmed:affiliationDepartment of Biochemistry, University of Southampton, Crescent East, UK.lld:pubmed
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