H. Taniguchi et al., MOLECULAR ANALYSIS OF KANAMYCIN AND VIOMYCIN RESISTANCE IN MYCOBACTERIUM-SMEGMATIS BY USE OF THE CONJUGATION SYSTEM, Journal of bacteriology, 179(15), 1997, pp. 4795-4801
We examined the molecular mechanisms of resistance to kanamycin and vi
omycin in Mycobacterium smegmatis. All of the M. smegmatis strains wit
h high:level kanamycin resistance had a nucleotide substitution from A
to G at position 1389 of the 16S rRNA gene (rrs). This position is eq
uivalent to position 1408 of Escherichia coli, and mutation at this po
sition is known to cause aminoglycoside resistance. Mutations from G t
o A or G to T at position 1473 of the M. smegmatis rrs gene were found
in viomycin-resistant mutants which had been designated vicB mutants
in our earlier studies, Using the M. smegmatis conjugation system, we
confirmed that these mutations indeed contributed to kanamycin and vio
mycin resistance, and kanamycin susceptibility was dominant over resis
tance in a heterogenomic strain, Additional experiments showed that th
ree of four Mycobacterium tuberculosis strains,vith high-level kanamyc
in resistance had a mutation from A to G at position 1400, which was e
quivalent to position 1389 of M. smegmatis.