Add time:09/01/2019         Source:sciencedirect.com

Myxococcus xanthus RppA and MmrA are homologous to methyl-accepting chemotaxis proteins (MCPs) and to multidrug transporters, respectively. We reported previously that rppA-mmrA double mutant exhibited reduced colony expansion, agglutination, and polysaccharide levels. We have demonstrated here that the rppA-mmrA mutant also exhibited reduced amino acid uptake. Furthermore, the double mutant appeared to be more susceptible to some antimicrobial agents, such as streptomycin, ethidium bromide and norfloxacin, than the wild-type. These phenotypes were not shown in the rppA or mmrA single mutant. These results indicate that M. xanthus RppA and MmrA are also involved in the uptake of amino acids and efflux of some antimicrobial agents.

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