Abstract
Mutants of Escherichia coli K-12 have been isolated in which several enzymes concerned with tyrosine biosynthesis are derepressed. These mutants were obtained from a parent strain possessing only a single 3-deoxy-d-arabinoheptulosonic acid-7-phosphate (DAHP) synthetase isoenzyme, DAHP synthetase (tyr), by selecting for resistance to the tyrosine analogue, 4-aminophenylalanine. The mutation responsible for this derepression has been mapped and the gene, which is not closely linked to aroF and tyrA, has been designated tyrR.
MeSH Terms
Chromatography
Conjugation, Genetic
Enzyme Repression
Escherichia coli/enzymology,growth & development
Genes, Regulator
Genetics, Microbial
Heptoses/biosynthesis
Hydro-Lyases/metabolism
Isomerases/metabolism
Ligases/analysis,metabolism
Molecular Biology
Mutation
Selection, Genetic
Transaminases/metabolism
Transduction, Genetic
Tyrosine/biosynthesis,pharmacology
Chemicals
Heptoses
Tyrosine
Transaminases
Hydro-Lyases
Isomerases
Ligases
Authors & Affiliations
2 authors, click to expand affiliations / ORCID
Wallace B J
Pittard J
References (14)
14 references, click to expand
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