title: Identification of the XorII methyltransferase gene and a vsr homolog from Xanthomonas oryzae pv. oryzae.
abstract: The gene encoding the XorII methyltransferase (M.XorII) was cloned from Xanthomonas oryzae pv. oryzae and characterized in Escherichia coli. The M.XorII activity was localized to a 3.1 kb BamHI-BstXI fragment, which contained two open reading frames (ORFs) of 1272 nucleotides (424 amino acids) and 408 nucleotides (136 amino acids). Ten polypeptide domains conserved in other M5 cytosine methyltransferases (MTases) were identified in the deduced amino acid sequence of the 1272 ORF. E. coli Mrr+ strains were transformed poorly by plasmids containing the XorII MTase gene, indicating the presence of at least one MCG in the recognition sequence for M.XorII (CGATCG). The 408 nucleotide ORF was 36% identical at the amino acid level to sequences of the E. coli dem-vsr gene, which is required for very short patch repair. X. oryzae pv. oryzae genomic DNA that is resistant to digestion by PvuI and XorII hybridizes with a 7.0 kb fragment containing the XorII MTase gene and vsr homolog, whereas DNA from strains that lack M.XorII activity do not hybridize with the fragment.
authors.affiliation: Department of Plant Pathology, Kansas State University, Manhattan 66506-5502.
authors.forename: S H
authors.initials: SH
authors.lastname: Choi
authors.forename: J E
authors.initials: JE
authors.lastname: Leach
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins; D001483:Base Sequence; D003001:Cloning, Molecular; D015254:DNA Modification Methylases / Q000235:genetics*; D015280:DNA Restriction-Modification Enzymes / Q000235:genetics; D004706:Endodeoxyribonucleases / Q000235:genetics*; D004926:Escherichia coli / Q000235:genetics; D005798:Genes, Bacterial / Q000235:genetics*; D015698:Genomic Library; D008969:Molecular Sequence Data; D015183:Restriction Mapping; D017386:Sequence Homology, Amino Acid; D013045:Species Specificity; D014170:Transformation, Genetic; D014974:Xanthomonas / Q000235:genetics*
chemical_list: D001426:Bacterial Proteins; D015280:DNA Restriction-Modification Enzymes; D015254:DNA Modification Methylases; C089252:DNA modification methylase XorII, Xanthomonas oryzae; D004706:Endodeoxyribonucleases; C071421:vsr endonuclease