title: Target of serine inhibition in Escherichia coli.
abstract: L-serine has long been known to inhibit growth of Escherichia coli cells cultured in minimal medium supplemented with glucose, lactate, or another carbohydrate as the sole source of carbon. However, the target of serine inhibition was not known. The growth inhibition was released by adding isoleucine, 2-ketobutyric acid, threonine or homoserine, but not by aspartate. Thus the inhibition site must be between aspartate and homoserine in the isoleucine biosynthetic pathway. We found that homoserine dehydrogenase I was strongly inhibited by serine. We isolated serine-resistant mutants, and found that in these mutants homoserine dehydrogenase I was resistant to serine. Thus, we conclude that the target of serine inhibition in Escherichia coli is homoserine dehydrogenase I.
authors.affiliation: Department of Microbiology, Faculty of Pharmaceutical Sciences, Okayama University, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Hama
authors.forename: Y
authors.initials: Y
authors.lastname: Sumita
authors.forename: Y
authors.initials: Y
authors.lastname: Kakutani
authors.forename: M
authors.initials: M
authors.lastname: Tsuda
authors.forename: T
authors.initials: T
authors.lastname: Tsuchiya
mesh_terms: D000429:Alcohol Oxidoreductases / Q000037:antagonists & inhibitors*; D002455:Cell Division / Q000187:drug effects; D004926:Escherichia coli / Q000187:drug effects* / Q000201:enzymology / Q000254:growth & development; D006715:Homoserine Dehydrogenase / Q000037:antagonists & inhibitors* / Q000302:isolation & purification; D007532:Isoleucine / Q000096:biosynthesis; D010071:Oxaloacetates / Q000378:metabolism; D012694:Serine / Q000494:pharmacology*
chemical_list: D010071:Oxaloacetates; D007532:Isoleucine; D012694:Serine; D000429:Alcohol Oxidoreductases; D006715:Homoserine Dehydrogenase