title: Altered translation of the uncC gene coding for the epsilon subunit of the F1F0-ATPase of Escherichia coli.
abstract: The nucleotide sequence of the previously described uncC424 allele was determined and found to be the same as that of a wild-type uncC gene. However, a G----A change occurred 7 nucleotides upstream from the translation start codon, changing the putative Shine-Dalgarno sequence from GAGG to GAAG. Four revertant strains were examined. In one revertant, which had normal growth and membrane properties, a single base deletion had occurred to re-form the Shine-Dalgarno sequence GAGG 1 nucleotide closer to the translation start codon. A second revertant had a single base deletion in the preceding uncD gene, causing an extension of the beta subunit by 6 amino acids and an increase, presumably by translational coupling, in the amount of epsilon subunit. The third and fourth revertant strains were phenotypically similar and had either C----T or G----T changes 18 or 19 nucleotides, respectively, upstream from the translation start codon.
mesh_terms: D001483:Base Sequence; D004269:DNA, Bacterial / Q000235:genetics; D004926:Escherichia coli / Q000235:genetics*; D005786:Gene Expression Regulation; D005798:Genes, Bacterial; D046911:Macromolecular Substances; D009154:Mutation; D009690:Nucleic Acid Conformation; D010641:Phenotype; D014176:Protein Biosynthesis; D006180:Proton-Translocating ATPases / Q000235:genetics*; D012333:RNA, Messenger / Q000235:genetics
chemical_list: D004269:DNA, Bacterial; D046911:Macromolecular Substances; D012333:RNA, Messenger; D006180:Proton-Translocating ATPases