Lactose and d -Galactose Metabolism in Group N Streptococci: Presence of Enzymes for Both the d -Galactose 1-Phosphate and d -Tagatose 6-Phosphate Pathways 1
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منابع مشابه
Lactose and D-galactose metabolism in Staphylococcus aureus. II. Isomerization of D-galactose 6-phosphate to D-tagatose 6-phosphate by a specific D-galactose-6-phosphate isomerase.
The inducible D-galactose-6-phosphate isomerase that functions in the metabolism of lactose and D-galactose in Staphylococcus aureus was partially purified from extracts of D-galactose-grown cells. It was shown to catalyze specifically the reversible isomerization of D-galactose 6-phosphate to D-tagatose 6-phosphate, the apparent Km values being 9.6 mM and 1.9 mM, respectively. At equilibrium, ...
متن کاملD-Tagatose 6-Phosphate Pathways1
Lactose is usually metabolized by A-galactosidase-catalyzed cleavage to D-glucose and D-galactose, followed by the conversion of Dgalactose to D-glucose 6-phosphate via the well known Leloir pathway (10): D-galactose *D galactose 1-phosphate D-glucose 1-phosphate D-glucose 6-phosphate. In Staphylococcus aureus, however, the disaccharide is utilized exclusively via lactose phosphate, which is cl...
متن کاملD-Mannitol 1-phosphate dehydrogenase and D-sorbitol 6-phosphate dehydrogenase in Aerobacter aerogenes.
n-Mannitol has been used as a carbon source for the growth of many microorganisms. Some bacteria contain diphosphopyridine nucleotide-dependent dehydrogenases that will oxidize n-mannitol to n-fructose at the nonphosphorylated level (2-5). On the other hand, Wolff and Kaplan (6, 7) have reported the presence of a diphosphopyridine nucleotide-dependent n-mannitol l-phosphate dehydrogenase that o...
متن کامل6-Deoxy-6-fluoro-d-galactose
The crystal structure unequivocally confirms the relative stereochemistry of the title compound, C(6)H(11)FO(5). The absolute stereochemistry was determined by the use of d-galactose as the starting material. The compound exists as a three-dimensional O-H⋯O hydrogen-bonded network with each mol-ecule acting as a donor and acceptor for four hydrogen bonds.
متن کاملCrystal Structure and Substrate Specificity of D-Galactose-6-Phosphate Isomerase Complexed with Substrates
D-Galactose-6-phosphate isomerase from Lactobacillus rhamnosus (LacAB; EC 5.3.1.26), which is encoded by the tagatose-6-phosphate pathway gene cluster (lacABCD), catalyzes the isomerization of D-galactose-6-phosphate to D-tagatose-6-phosphate during lactose catabolism and is used to produce rare sugars as low-calorie natural sweeteners. The crystal structures of LacAB and its complex with D-tag...
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ژورنال
عنوان ژورنال: Journal of Bacteriology
سال: 1974
ISSN: 0021-9193,1098-5530
DOI: 10.1128/jb.117.1.318-320.1974