title: Modular organization of related Archaeal plasmids encoding different restriction-modification systems in Methanobacterium thermoformicicum.
abstract: Nucleotide sequence comparison of the related 13513-bp plasmid pFV1 and the 11014-bp plasmid pFZ1 from the thermophilic archaeon Methanobacterium thermoformicicum THF and Z-245, respectively, revealed a homologous, approximately 8.2 kb backbone structure that is interrupted by plasmid-specific elements. Various highly conserved palindromic structures and an ORF that could code for a NTP-binding protein were identified within the backbone structure and may be involved in plasmid maintenance and replication. Each plasmid contains at comparable locations a module which specifies components of different restriction-modification (R/M) systems. The R/M module of pFV1 contained, in addition to the genes of the GGCC-recognizing R/M system MthTI, an ORF which may be involved in repair of G-T mismatches generated by deamination of m5C at high temperatures.
authors.affiliation: Department of Microbiology, Wageningen Agricultural University, The Netherlands.
authors.forename: J
authors.initials: J
authors.lastname: Nölling
authors.forename: F J
authors.initials: FJ
authors.lastname: van Eeden
authors.forename: R I
authors.initials: RI
authors.lastname: Eggen
authors.forename: W M
authors.initials: WM
authors.lastname: de Vos
mesh_terms: D000595:Amino Acid Sequence; D001105:Archaea / Q000201:enzymology* / Q000235:genetics*; D001426:Bacterial Proteins / Q000235:genetics*; D001483:Base Sequence; D003001:Cloning, Molecular; D045647:DNA Glycosylases; D004260:DNA Repair; D004262:DNA Restriction Enzymes / Q000235:genetics*; D004269:DNA, Bacterial / Q000737:chemistry / Q000235:genetics*; D043224:Deoxyribonuclease (Pyrimidine Dimer); D004706:Endodeoxyribonucleases / Q000235:genetics*; D004926:Escherichia coli / Q000235:genetics; D017014:Methanobacterium / Q000201:enzymology* / Q000235:genetics*; D008969:Molecular Sequence Data; D009699:N-Glycosyl Hydrolases / Q000235:genetics*; D009690:Nucleic Acid Conformation; D009838:Oligodeoxyribonucleotides; D016366:Open Reading Frames; D010957:Plasmids; D016133:Polymerase Chain Reaction / Q000379:methods; D017386:Sequence Homology, Amino Acid
chemical_list: D001426:Bacterial Proteins; D004269:DNA, Bacterial; D009838:Oligodeoxyribonucleotides; D004706:Endodeoxyribonucleases; D004262:DNA Restriction Enzymes; D043224:Deoxyribonuclease (Pyrimidine Dimer); D045647:DNA Glycosylases; D009699:N-Glycosyl Hydrolases; C061738:mutY adenine glycosylase