D-木酮糖,D-Xylulose 

D-Xylulose is a ketopentose, a monosaccharide containing five carbon atoms and a ketone functional group. It is converted from xylitol in the glucoronate-xylulose pathway. D-Xylulokinase catalyzes the ATP-dependent phosphorylation of D-xylulose to produce xylulose 5-phosphate, which is linked to the pentose-phosphate pathway.

D-Xylulose, also known as D-lyxulose or D-threo-pentulose, belongs to the class of organic compounds known as pentoses. These are monosaccharides in which the carbohydrate moiety contains five carbon atoms. D-Xylulose exists as a liquid, soluble (in water), and a very weakly acidic compound (based on its pKa). D-Xylulose has been detected in multiple biofluids, such as urine, blood, and cerebrospinal fluid. Within the cell, D-xylulose is primarily located in the cytoplasm. D-Xylulose exists in all eukaryotes, ranging from yeast to humans. D-Xylulose participates in a number of enzymatic reactions. In particular, D-Xylulose can be biosynthesized from D-xylitol through the action of the enzyme D-xylulose reductase. In addition, D-Xylulose can be converted into xylulose 5-phosphate; which is catalyzed by the enzyme xylulose kinase. D-Xylulose has been linked to several inborn metabolic disorders including pentosuria and ribose-5-phosphate isomerase deficiency.

D-xylulose is the D-enantiomer of xylulose. It has a role as a human metabolite, an Escherichia coli metabolite, a Saccharomyces cerevisiae metabolite and a mouse metabolite. It is an enantiomer of a L-xylulose.

A 5-carbon keto sugar.

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