title: Nucleotide sequence and transcriptional analysis of the E. coli ushA gene, encoding periplasmic UDP-sugar hydrolase (5'-nucleotidase): regulation of the ushA gene, and the signal sequence of its encoded protein product.
abstract: The DNA sequence of the ushA gene, encoding UDP-sugar hydrolase (5'-nucleotidase), has been determined. The amino-terminal sequence encodes a signal peptide whose predicted processing site is confirmed by N-terminal amino acid analysis of purified mature UshA protein. The signal sequence contains a concentration of rare codons in comparison with the mature sequence. The origins of transcription from the ushA promoter have been determined, using primer extension. Three transcripts, originating within a 6 bp region, were identified and might be related to three overlapping potential -10 hexamers in the ushA promoter region. There was a discernable change in the relative proportion of these transcripts during growth-phase regulation of the ushA gene.
mesh_terms: D015720:5'-Nucleotidase; D000595:Amino Acid Sequence; D001483:Base Sequence; D004262:DNA Restriction Enzymes / Q000378:metabolism; D004269:DNA, Bacterial / Q000032:analysis; D004591:Electrophoresis, Polyacrylamide Gel; D004926:Escherichia coli / Q000201:enzymology / Q000235:genetics*; D009708:Nucleotidases / Q000235:genetics*; D011401:Promoter Regions, Genetic; D021382:Protein Sorting Signals / Q000032:analysis / Q000235:genetics*; D014158:Transcription, Genetic
chemical_list: D004269:DNA, Bacterial; D021382:Protein Sorting Signals; D004262:DNA Restriction Enzymes; D009708:Nucleotidases; D015720:5'-Nucleotidase