title: The amino acid sequence of Lrp is highly conserved in four enteric microorganisms.
abstract: Lrp (leucine-responsive regulatory protein) is a global regulator of metabolism in Escherichia coli (J. M. Calvo and R. G. Matthews, Microbiol. Rev. 58:466-490, 1994). The lrp genes from three other enteric microorganisms, Enterobacter aerogenes, Klebsiella aerogenes, and Salmonella typhimurium, were cloned and sequenced. An analysis of these sequences and of the previously determined sequence from E. coli indicated that the vast majority of changes were synonymous rather than nonsynonymous changes. Nucleotide changes occurred at 89 of 492 positions but resulted in amino acid changes at only 2 of 164 positions. This analysis suggests that the Lrp amino acid sequence is highly adapted for function and that almost all amino acid changes lead to a protein that functions less well than the wild-type protein.
authors.affiliation: Section of Genetics, Cornell University, Ithaca, New York 14853.
authors.forename: D
authors.initials: D
authors.lastname: Friedberg
authors.forename: J V
authors.initials: JV
authors.lastname: Platko
authors.forename: B
authors.initials: B
authors.lastname: Tyler
authors.forename: J M
authors.initials: JM
authors.lastname: Calvo
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000235:genetics*; D001483:Base Sequence; D003001:Cloning, Molecular; D017124:Conserved Sequence; D004268:DNA-Binding Proteins / Q000235:genetics*; D004754:Enterobacter / Q000235:genetics; D004755:Enterobacteriaceae / Q000235:genetics*; D004926:Escherichia coli / Q000235:genetics; D029968:Escherichia coli Proteins; D015964:Gene Expression Regulation, Bacterial; D007711:Klebsiella pneumoniae / Q000235:genetics; D051756:Leucine-Responsive Regulatory Protein; D008969:Molecular Sequence Data; D012486:Salmonella typhimurium / Q000235:genetics; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D012689:Sequence Homology, Nucleic Acid; D014157:Transcription Factors
chemical_list: D001426:Bacterial Proteins; D004268:DNA-Binding Proteins; D029968:Escherichia coli Proteins; C497278:Lrp protein, E coli; D014157:Transcription Factors; D051756:Leucine-Responsive Regulatory Protein