1887

Abstract

utilizes sucrose [glucose-fructose in α(1→2) linkage] and its five isomeric α-D-glucosyl-D-fructoses as energy sources for growth. Sucrose-grown cells are induced for both sucrose-6-phosphate hydrolase (S6PH) and fructokinase (FK), but the two enzymes are not expressed above constitutive levels during growth on the isomeric compounds. Extracts of cells grown previously on the sucrose isomers trehalulose α(1→1), turanose α(1→3), maltulose α(1→4), leucrose α(1→5) and palatinose α(1→6) contained high levels of an NAD plus metal-dependent phospho-α-glucosidase (MalH). The latter enzyme was not induced during growth on sucrose. MalH catalysed the hydrolysis of the 6′-phosphorylated derivatives of the five isomers to yield glucose 6-phosphate and fructose, but sucrose 6-phosphate itself was not a substrate. Unexpectedly, MalH hydrolysed both α- and β-linked stereomers of the chromogenic analogue -nitrophenyl glucoside 6-phosphate. The gene is adjacent to and , which encode an EII(CB) component of the phosphopyruvate-dependent sugar:phosphotransferase system and a putative regulatory protein, respectively. The authors suggest that for , the products of and catalyse the phosphorylative translocation and intracellular hydrolysis of the five isomers of sucrose and of related α-linked glucosides. Genes homologous to and are present in both and the enterohaemorrhagic strain O157:H7. Both these organisms grew well on sucrose, but only exhibited growth on the isomeric compounds.

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2002-03-01
2019-12-08
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