Mutations affecting substrate specificity of the Bacillus subtilis multidrug transporter Bmr

Katya A. Klyachko, Shimon Schuldiner, Alexander A. Neyfakh*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

67 Scopus citations


The Bacillus subtilis multidrug transporter Bmr, a member of the major facilitator superfamily of transporters, causes the efflux of a number of structurally unrelated toxic compounds from cells. We have shown previously that the activity of Bmr can he inhibited by the plant alkaloid reserpine. Here we demonstrate that various substitutions of residues Phe143 and Phe306 of Bmr not only reduce its sensitivity to reserpine inhibition but also significantly change its substrate specificity. Cross-resistance profiles of bacteria expressing mutant forms of the transporter differ from each other and from the cross-resistance profile of cells expressing wild- type Bmr. This result strongly suggests that Bmr interacts with its transported drugs directly, with residues Phe143 and Phe306 likely to be involved in substrate recognition.

Original languageEnglish (US)
Pages (from-to)2189-2193
Number of pages5
JournalJournal of bacteriology
Issue number7
StatePublished - 1997
Externally publishedYes

ASJC Scopus subject areas

  • Molecular Biology
  • Microbiology


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