Three genes controlling streptomycin susceptibility in Agrobacterium fabrum
Howarth, R. E.; Pattillo, C. M.; Griffitts, J. S.; Calvopina-Chavez, D. G.
Show abstract
Streptomycin is a commonly used antibiotic for its efficacy against diverse bacteria. The plant pathogen Agrobacterium fabrum is a model for studying pathogenesis and interkingdom gene transfer. Streptomycin-resistant variants of A. fabrum are commonly employed in genetic analyses, yet mechanisms of resistance and susceptibility to streptomycin in this organism have not previously been investigated. We observe that resistance to a high concentration of streptomycin arises at high frequency in A. fabrum and we link this trait to the presence of a chromosomal gene (strB) encoding a putative aminoglycoside phosphotransferase. We show how strB, along with rpsL (encoding ribosomal protein S12) and rsmG (encoding a 16S rRNA methyltransferase) modulate streptomycin sensitivity in A. fabrum.
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