Abstract
Mutants defective in utilization of uracil at low concentrations have been isolated and characterized. The mutations in question (uraA) map close to the upp gene encoding uracil phosphoribosyltransferase. By complementation analysis, a plasmid that complements the uraA mutation has been isolated. The uraA gene was shown to be the second gene in a bicistronic operon with upp as the promoter proximal gene. The nucleotide sequence of the gene was determined, and the gene encodes a hydrophobic membrane protein with a calculated Mr of 45,030. The UraA protein has been identified in sodium dodecyl sulfate-polyacrylamide gels in the membrane fraction of minicells harboring the uraA plasmids.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Amino Acid Sequence
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Bacterial Proteins / chemistry
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Bacterial Proteins / genetics
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Bacterial Proteins / metabolism
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Base Sequence
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Biological Transport, Active
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Carrier Proteins / chemistry
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Carrier Proteins / genetics
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Carrier Proteins / metabolism
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Chromosome Mapping
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Cloning, Molecular
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DNA, Bacterial / genetics
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Escherichia coli / genetics*
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Escherichia coli / metabolism*
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Escherichia coli Proteins*
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Genes, Bacterial*
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Membrane Proteins / chemistry
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Membrane Proteins / genetics
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Membrane Proteins / metabolism
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Membrane Transport Proteins*
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Molecular Sequence Data
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Molecular Structure
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Mutation*
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Operon
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Pentosyltransferases / genetics
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Promoter Regions, Genetic
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Subcellular Fractions / metabolism
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Uracil / metabolism*
Substances
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Bacterial Proteins
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Carrier Proteins
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DNA, Bacterial
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Escherichia coli Proteins
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Membrane Proteins
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Membrane Transport Proteins
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UraA protein, E coli
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Uracil
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Pentosyltransferases
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uracil phosphoribosyltransferase