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Volume 142, Issue 11

The gene of K-12 is located in an operon Free

Abstract

The structural gene () for succinyl-AMP (S-AMP) lyase and three additional ORFs are on the same DNA strand of the chromosome of Cassette mutagenesis and primer extension mapping demonstrated that is co-transcribed with an upstream gene (ORF23, or ) encoding a 22·9 kDa membrane-associated protein of non-essential, but unknown, function unrelated to purine biosynthesis. The operon lies between and an ORF expressing an essential function which may correspond to ). S-AMP lyase was purified to near homogeneity. The purified enzyme is a homotetramer of 50 kDa subunits, has a for S-AMP of 3·7 M and a pH optimum of 7·4–7·6.

  • Received:
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Keyword(s): Escherichia coli , internal promoter , phoP gene , purB gene and succinyl-AMP lyase
� Society for General Microbiology 1996
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1996-11-01
2025-05-21
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The purB gene of Escherichia coli K-12 is located in an operon
Microbiology 142, 3219 (1996); https://doi.org/10.1099/13500872-142-11-3219
/content/journal/micro/10.1099/13500872-142-11-3219
/content/journal/micro/10.1099/13500872-142-11-3219
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