threo-Pentulose; a 2-ketopentose. l-X. appears in the urine in cases of essential pentosuria; it is also an intermediate in the glucuronate pathway. SYN: xyloketose.
- x. 5-phosphate the d-isomer is an intermediate in the pentose phosphate pathway and in transketolization.
- x. reductase an enzyme that reversibly converts x. to xylitol using either NADH (d-x. reductase) or NADPH (l-x. reductase); a deficiency of the l form is seen in individuals with essential pentosuria. SYN: xylitol dehydrogenase.

* * *

xy·lu·lose 'zīl-(y)ə-.lōsalso -.lōz n 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

* * *

xy·lu·lose (ziґlu-lōs) a ketopentose epimeric with ribulose at the 3 carbon, occurring naturally as both the D- and L- isomers. The latter is excreted in the urine in essential pentosuria; the former, phosphorylated at the 5 carbon (D-xylulose 5-phosphate), is an intermediate in the pentose phosphate pathway.

Medical dictionary. 2011.

Игры ⚽ Поможем сделать НИР

Look at other dictionaries:

  • Xylulose — D et L Xylulose structure Général Nom IUPAC (3R,4S) 1,3,4,5 Tetrahydroxypentan 2 one …   Wikipédia en Français

  • Xylulose — Xylulose[1][2] …   Wikipedia

  • Xylulose — Strukturformel Fischer Projektion, offenkettige Darstellung Allgemeines …   Deutsch Wikipedia

  • Xylulose — Xy|lu|lo|se [↑ Xyl (2) u. ↑ ulose], die; ; Symbol: Xul; systematisches Syn.: D threo Pent 2 ulose: mit Xylose isomere Pentulose, als Glucuronsäuremetabolit ein Zwischenprodukt des Pentosephosphatwegs. * * * Xylulose   die …   Universal-Lexikon

  • xylulose — ksiluliozė statusas T sritis chemija apibrėžtis Ketopentozė. formulė HOCH₂CO(CHOH)₂CH₂OH atitikmenys: angl. xylulose rus. ксилулоза …   Chemijos terminų aiškinamasis žodynas

  • Xylulose 5-phosphate — Identifiers CAS number 60802 29 1 …   Wikipedia

  • Xylulose-5-phosphat — Strukturformel deprotonierte Form vonD Xylulose 5 phosphat Allgemeines …   Deutsch Wikipedia

  • xylulose — A 5 carbon ketose sugar, whose 5 phosphate is an intermediate in the pentose phosphate pathway and the Calvin Benson cycle …   Dictionary of molecular biology

  • xylulose — noun The ketopentose (3R,4S) 1,3,4,5 Tetrahydroxypentan 2 one …   Wiktionary

  • xylulose — xy·lu·lose …   English syllables

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”