Xylulose is a ketopentose, a monosaccharide containing five carbon atoms, and including a ketone functional group. It has the chemical formula C 5 H 10 O 5 . In nature, it occurs in both the L - and D - enantiomers .

Saccharomyces cerevisiae can naturally ferment D-xylulose through the pentose phosphate pathway. In another approach, bacterial xylose isomerases have been introduced into S. cerevisiae. This enzyme catalyze the direct formation of D-xylulose from D-xylose.

Feb 1, 2020 · Xylose is initially converted into xylulose by different enzymes in various microorganisms. In bacteria, isomerization of xylose to xylulose is usually catalyzed by xylose isomerase (XI) directly , whereas yeast and mycelial fungi need a two-step pathway employing d-xylose reductase (XR) and xylitol dehydrogenase (XDH) . In this XR-XDH pathway ...

Xylose (cf. Ancient Greek: ξύλον, xylon, "wood") is a sugar first isolated from wood, and named for it.Xylose is classified as a monosaccharide of the aldopentose type, which means that it contains five carbon atoms and includes an aldehyde functional group.It is derived from hemicellulose, one of the main constituents of biomass.Like most sugars, it can adopt several structures depending ...

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 .

In particular, xylulose-5-phosphate can be used to directly generate glycerinaldehyde-3-phosphate in the pathway 2. Other studies have also demonstrated that xylulose-5-phosphate may also play a role in gene expression, perhaps by promoting ChREBP transcription factor in the well-fed state 3 .

Xylulose is phosphorylated at the C5–OH position by xylulokinase (XK) to yield xylulose-5-phosphate (X5P), which is further channeled into glycolytic intermediates such as glyceraldehyde-3-phosphate (GA3P) and fructose-6-phosphate (F6P) via the pentose phosphate pathway (PPP).

The meaning of XYLULOSE is a ketose sugar C5H10O5 of the pentose class that plays a role in carbohydrate metabolism and is found in the urine in cases of pentosuria.

D-Xylulose 5-phosphate (D-xylulose-5-P) is an intermediate in the pentose phosphate pathway. It is a ketose sugar formed from ribulose-5-phosphate by ribulose-5-phosphate epimerase. In the non-oxidative branch of the pentose phosphate pathway, xylulose-5-phosphate acts as a donor of two-carbon ketone groups in transketolase reactions.

Dec 12, 2021 · Xylulokinase (XK) (EC 2.7.1.17) is a substrate (d-xylulose) specific kinase enzyme catalysing the phosphorylation reaction d-xylulose + ATP → d-xylulose-5-phopsphate + ADP. XK in B. coagulans is a 56 kDa protein consisting of 1536 bp with 511 amino acids.