title: Nucleotide sequence of the tetM tetracycline resistance determinant of the streptococcal conjugative shuttle transposon Tn1545.
abstract: The nucleotide sequence of the tetracycline resistance gene tetM encoded by streptococcal conjugative shuttle transposon Tn1545 has been determined. The resistance gene was identified as a coding sequence of 1917 base pairs corresponding to a protein with a Mr of 72,500 daltons. This value is in good agreement with that, 68,000 daltons, estimated by SDS-polyacrylamide gel electrophoresis of Escherichia coli minicell extracts. The tetM gene product does not exhibit any sequence homology with either the Gram-negative (tetA, tetB and tetC), or the Bacillus and Staphylococcus tetracycline resistance proteins. The average hydropathy value of the tetM gene product (-0.21) contrasts with those calculated for the other TET proteins which are markedly hydrophobic (0.76 to 0.93). Hybridization experiments performed with an intragenic tetM probe do not support the claim [Taylor, D. (1986), J. Bact. 165, 1037-1039)] that tetracycline resistance in Campylobacter is due to acquisition of tetM.
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000235:genetics*; D001483:Base Sequence; D003001:Cloning, Molecular; D003227:Conjugation, Genetic; D004251:DNA Transposable Elements; D004269:DNA, Bacterial / Q000235:genetics; D004352:Drug Resistance, Microbial; D004926:Escherichia coli / Q000235:genetics; D005798:Genes, Bacterial; D012995:Solubility; D013291:Streptococcus / Q000235:genetics*; D013752:Tetracycline
chemical_list: D001426:Bacterial Proteins; D004251:DNA Transposable Elements; D004269:DNA, Bacterial; D013752:Tetracycline