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. 1985 Apr;162(1):106-9.
doi: 10.1128/jb.162.1.106-109.1985.

Escherichia coli mutants possessing an Li+-resistant melibiose carrier

S Shiota, Y Yamane, M Futai, T Tsuchiya

Escherichia coli mutants possessing an Li+-resistant melibiose carrier

S Shiota et al. J Bacteriol. 1985 Apr.

Abstract

Escherichia coli K-12 strains in the absence of the lactose carrier grew on the disaccharide melibiose as the sole source of carbon. The presence of 0.1 mM Li+ in the medium strongly inhibited growth of such cells, and Li+-resistant mutants appeared after several days of incubation. These mutants showed altered cation coupling to melibiose transport via the melibiose carrier. Cotransport between H+ and melibiose was lost in the mutants, although Na+-melibiose cotransport was retained. We observed no Li+-melibiose cotransport. Therefore, these mutants represent a new type of cation-coupling mutants of the melibiose carrier.

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