Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references
Chemical compound
Ribulose is a ketopentose — a monosaccharide containing five carbon atoms, and including a ketone functional group. It has chemical formula C5H10O5. Two enantiomers are possible, d-ribulose (d-erythro-pentulose) and l-ribulose (l-erythro-pentulose). d-Ribulose is the diastereomer of d-xylulose.
Ribulose sugars are composed in the pentose phosphate pathway from arabinose.[1] They are important in the formation of many bioactive substances. For example, d-ribulose is an intermediate in the fungal pathway for d-arabitol production. Also, as the 1,5-bisphosphate, d-ribulose combines with carbon dioxide at the start of the photosynthesis process in green plants (carbon dioxide trap).[2]
Ribulose has the same stereochemistry at carbons 3 and 4 as the five-carbon aldoses ribose and arabinose.
^Guo, Zongren; Long, Liangkun; Ding, Shaojun (2020). "Characterization of an L-Arabinose Isomerase from Bacillus velezensis and Its Application for L-Ribulose and L-Ribose Biosynthesis". Applied Biochemistry and Biotechnology. 192 (3): 935–951. doi:10.1007/s12010-020-03380-0. PMID 32617845. S2CID 220296031.
^Spreitzer, Robert J.; Salvucci, Michael E. (2002). "RUBISCO: Structure, Regulatory Interactions, and Possibilities for a Better Enzyme". Annual Review of Plant Biology. 53: 449–475. doi:10.1146/annurev.arplant.53.100301.135233. PMID 12221984.
Ribulose-1,5-bisphosphate carboxylase/oxygenase, commonly known by the abbreviations RuBisCo, rubisco, RuBPCase, or RuBPco, is an enzyme (EC 4.1.1.39)...
possible, d-ribulose (d-erythro-pentulose) and l-ribulose (l-erythro-pentulose). d-Ribulose is the diastereomer of d-xylulose. Ribulose sugars are composed...
collectively called the Calvin cycle: carboxylation, reduction reactions, and ribulose 1,5-bisphosphate (RuBP) regeneration. Though it is also called the "dark...
assimilating reduced one-carbon compounds by way of carbon dioxide using the ribulose bisphosphate pathway. These organisms should not be confused with methanogens...
Phosphopentose epimerase (also known as ribulose-phosphate 3-epimerase and ribulose 5-phosphate 3-epimerase, EC 5.1.3.1) encoded in humans by the RPE...
D)-ribulose ⇌ {\displaystyle \rightleftharpoons } ADP + L(or D)-ribulose 5-phosphate The 3 substrates of this enzyme are ATP, L-ribulose, and D-ribulose...
enzyme that catalyzes the ATP-dependent phosphorylation of ribulose 5-phosphate (RuP) into ribulose 1,5-bisphosphate (RuBP), both intermediates in the Calvin...
transformation. Ribulose-1,5-bisphosphate is a key substrate in the Calvin cycle of photosynthesis. In the Calvin cycle, the ribulose equilibrates with...
CO2 by plants. This process is necessary for their growth. The enzyme ribulose 1,5-bisphosphate carboxylase/oxygenase (RuBisCO) fixes a molecule of carbon...
atmospheric carbon dioxide into existing organic carbon compounds, such as ribulose bisphosphate (RuBP) in a sequence of light-independent (or dark) reactions...