title: Nonsense mutations in the maltose A region of the genetic map of Escherichia coli.
abstract: The isolation of one amber mutation in malQ, one ochre mutation in malP, and seven amber mutations in malT is reported. A study of their phenotypic expressions in the presence of the amber suppressor su(III) and the ochre suppressor su(c) suggests that (i) malQ is the structural gene for amylomaltase; (ii) malQ and the structural gene for maltodextrin phosphorylase, malP, belong to the same operon; (iii) the malT product, which promotes the expression of the malP-malQ operon, is a protein synthesized in limiting amounts by the wild-type strain.
mesh_terms: D002874:Chromosome Mapping; D004926:Escherichia coli / Q000201:enzymology; D005964:Glucosyltransferases; D008320:Maltose; D008967:Molecular Biology; D009154:Mutation; D014161:Transduction, Genetic
chemical_list: D008320:Maltose; D005964:Glucosyltransferases