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A pentose sugar, also known as d -riboketose and d -erythropetulose; it has never been prepared in crystalline form, and exists only as a syrup. The structural formula of ribulose is shown below.

Ribulose-5-phosphate occurs in animal and plant tissues. It can be converted to ribulose-l, 5-diphosphate by a phosphokinase enzyme acting in the presence of adenosine triphosphate (ATP). The ribulose-5-phosphate is also a significant intermediate in the carbohydrate metabolism through the pentose phosphate pathway. See Carbohydrate metabolism, Monosaccharide

McGraw-Hill Concise Encyclopedia of Bioscience. © 2002 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



(also D-erythropetulose), a monosaccharide belonging to the pentose (ketopentose) group. The esters of ribulose and phosphoric acid, namely, ribulose-5-phosphate and ribulose-1, 5-diphosphate, participate in important metabolic processes involving the breakdown of carbohydrates (pentose phosphate cycle), as well as in the production of carbohydrates in green plants during photosynthesis. Ribulose can be obtained either by the action of alkalis on arabinose or from formaldehyde in the presence of CaCO3.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


C5H10O5 A pentose sugar that exists only as a syrup; synthesized from arabinose by isomerization with pyridine; important in carbohydrate metabolism. Also known asD-erythropentose;D-riboketose.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.