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. 1988 Jun;170(6):2568–2574. doi: 10.1128/jb.170.6.2568-2574.1988

A new pleiotropic mutation causing defective carbohydrate uptake in Escherichia coli K-12: isolation, mapping, and preliminary characterization.

S K Mahajan 1, N B Vartak 1, A R Datta 1
PMCID: PMC211173  PMID: 2836361

Abstract

A new pleiotropic mutation, designated cup-1 (for carbohydrate uptake), which impairs the ability of Escherichia coli cells to grow on a large number of phosphotransferase system (PTS) and non-PTS carbohydrates by blocking their entry into the cells, has been isolated, partially characterized, and mapped. The mutants grew poorly even on rich and glucose minimal media. Fast-growing revertants rapidly accumulated in cultures grown on either of the above two media and made stable maintenance of the mutation difficult. Several extragenic suppressor mutations that permitted cup cells to grow on specific single sugars or groups of sugars have been isolated. One such suppressor, which enabled cup cells to grow as well on glycerol minimal medium as their wild-type parent, has been helpful in stably maintaining these cells in this medium. cup-1 has been mapped to 97 min on the standard E. coli map. It cotransduced with a transposon Tn10 inserted clockwise to it and (very weakly) with uxuA. Surprisingly, it failed to cotransduce with pyrB, argI, or valS, three markers located nearby but counterclockwise to it. In F' merodiploids, cup-1 was dominant over its cup+ allele. Cyclic AMP permitted growth of cup-1 cells on some sugars but not all. Apparently, reduced cyclic AMP level and therefore noninduction of several sugar operons is one but not the only effect of cup.

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Selected References

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