title: Characterization of the Rickettsia prowazekii pepA gene encoding leucine aminopeptidase.
abstract: The pepA gene, encoding a protein with leucine aminopeptidase activity, was isolated from Rickettsia prowazekii, an obligate intracellular parasitic bacterium. Nucleotide sequence analysis revealed an open reading frame of 1,502 bp that would encode a protein of 499 amino acids with a calculated molecular weight of 53,892, a size comparable to that of the protein produced in Escherichia coli minicells containing the rickettsial gene. Also, heat-stable leucine aminopeptidase activity was demonstrable in an E. coli peptidase-deficient strain containing R. prowazekii pepA. Comparison of the amino acid sequence of the R. prowazekii PepA with the characterized leucine aminopeptidases from E. coli, Arabidopsis thaliana, and bovine eye lens revealed that 39.8, 34.9, and 34.0% of the residues were identical, respectively. Residues proposed to be part of the active site or involved in the binding of metal ions in the bovine metalloenzyme were all conserved in R. prowazekii PepA. However, despite the structural and enzymatic similarity to E. coli PepA, the R. prowazekii protein was unable to complement the cer site-specific, PepA-dependent recombination system found in E. coli that resolves ColE1-type plasmid multimers into their monomeric forms.
authors.affiliation: Department of Microbiology and Immunology, University of South Alabama College of Medicine, Mobile 36688.
authors.forename: D O
authors.initials: DO
authors.lastname: Wood
authors.forename: M J
authors.initials: MJ
authors.lastname: Solomon
authors.forename: R R
authors.initials: RR
authors.lastname: Speed
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000378:metabolism; D001483:Base Sequence; D003001:Cloning, Molecular; D016384:Consensus Sequence; D004926:Escherichia coli / Q000235:genetics; D005798:Genes, Bacterial / Q000235:genetics*; D005816:Genetic Complementation Test; D007931:Leucyl Aminopeptidase / Q000096:biosynthesis / Q000235:genetics*; D008969:Molecular Sequence Data; D011994:Recombinant Proteins / Q000096:biosynthesis / Q000235:genetics; D011995:Recombination, Genetic; D012283:Rickettsia prowazekii / Q000201:enzymology / Q000235:genetics*; D017386:Sequence Homology, Amino Acid
chemical_list: D001426:Bacterial Proteins; D011994:Recombinant Proteins; D007931:Leucyl Aminopeptidase