title: The DNA adenine methyltransferase-encoding gene (dam) of Vibrio cholerae.
abstract: The DNA adenine methyltransferase (MTase)-encoding gene (dam) of Vibrio cholerae, an organism belonging to the family Vibrionaceae, has been cloned and the complete nucleotide (nt) sequence determined. V. cholerae dam encodes a 21.5-kDa protein and is directly involved in methyl-directed DNA mismatch repair. It can substitute for the Escherichia coli enzyme and can suppress the phenotypic traits associated with E. coli dam mutants. Overproduction of V. cholerae Dam MTase does not result in hypermutability in either V. cholerae or E. coli cells. Overproduction of V. cholerae Dam in a pUC plasmid, however, fails to suppress the 2-aminopurine (2-AP)-sensitive phenotype of E. coli dam mutants. Homology between the nt and deduced amino acid (aa) sequences of the E. coli and V. cholerae dam genes is only 30-35%.
authors.affiliation: Biophysics Division, Indian Institute of Chemical Biology, Calcutta.
authors.forename: R
authors.initials: R
authors.lastname: Bandyopadhyay
authors.forename: J
authors.initials: J
authors.lastname: Das
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D003001:Cloning, Molecular; D004269:DNA, Bacterial; D004926:Escherichia coli; D029968:Escherichia coli Proteins; D005816:Genetic Complementation Test; D005822:Genetic Vectors; D008780:Methyltransferases / Q000235:genetics*; D008969:Molecular Sequence Data; D011994:Recombinant Proteins / Q000235:genetics; D015265:Site-Specific DNA-Methyltransferase (Adenine-Specific); D014734:Vibrio cholerae / Q000201:enzymology / Q000235:genetics*
chemical_list: D004269:DNA, Bacterial; D029968:Escherichia coli Proteins; D011994:Recombinant Proteins; D008780:Methyltransferases; C058693:Dam methyltransferase; D015265:Site-Specific DNA-Methyltransferase (Adenine-Specific); C499294:dam protein, E coli