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. 1993 Apr;175(7):2137–2142. doi: 10.1128/jb.175.7.2137-2142.1993

Two glucose transport systems in Bacillus licheniformis.

M Tangney 1, F G Priest 1, W J Mitchell 1
PMCID: PMC204328  PMID: 8384621

Abstract

Bacillus licheniformis NCIB 6346 showed active accumulation of glucose which was inhibited by agents which affect the transmembrane proton gradient. Phosphotransferase (PTS) activity, identified as phosphoenolpyruvate-dependent phosphorylation of glucose, was found in cell extracts but could not be demonstrated in cells permeabilized with toluene when assays were conducted at pH 6.6. The same was true for mannitol and fructose phosphotransferase activities. Cells grown on fructose accumulated glucose at a slower rate than glucose-grown cells, and extracts prepared from them did not contain glucose PTS activity. Examination of the effects of analogs on glucose uptake and phosphorylation showed that 2-deoxyglucose was not a PTS substrate, but did markedly inhibit glucose uptake, with stronger inhibition in cells grown on fructose. Glucose accumulation by whole cells grown on glucose became less sensitive to the uncoupler tetrachlorosalicylanilide (TCS) as the pH was raised from 6.6 to 8.0, while in fructose-grown cells TCS was equally effective across this pH range. PTS activity was exhibited by toluene-treated cells at pH 7.5 and above, although the system itself in extracts was not affected by pH in the range of 5.0 to 8.0. The results are consistent with the presence of two glucose transport systems, one a PTS and the other operating by an alternative mechanisms, and suggest that the PTS in B. licheniformis may be regulated in a pH-dependent manner.

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Selected References

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