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ribulose
ribulose Biochem. (ˈraɪbjʊləʊz, -s) [f. ribose + -ulose2.] A ketopentose sugar which in the form of phosphate esters is an important intermediate in carbohydrate metabolism and photosynthesis.1936 Jrnl. Biol. Chem. CXV. 731 The formation of d- and l-ribulose from d- and l-arabinose respectively has ...
Oxford English Dictionary
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Ribulose
Two enantiomers are possible, -ribulose (-erythro-pentulose) and -ribulose (-erythro-pentulose). -Ribulose is the diastereomer of -xylulose. For example, -ribulose is an intermediate in the fungal pathway for -arabitol production.
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Ribulokinase
In enzymology, a ribulokinase () is an enzyme that catalyzes the chemical reaction
ATP + L(or D)-ribulose ADP + L(or D)-ribulose 5-phosphate
The 3 substrates of this enzyme are ATP, L-ribulose, and D-ribulose, whereas its 3 products are ADP, L-ribulose 5-phosphate, and D-ribulose 5-phosphate.
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How exactly is glyceraldehyde 3-Phosphate reverted to ribulose 1,5-bisphosphate for the continuation of the calvin cycle? Around 6 molecules of G3P is produced at the end of the Calvin Cycle (light independent reactio...
The regeneration of 3 ribulose-1,5-2P has the overall reaction
5 glyceraldehyde-3P + 3 ATP $\rightarrow$ 3 ribulose-1,5-2P + 3 ADP + 2 Pi
So in total eight phosphates (here counting ATP as 1) are redistributed, 6 of which end up in ribulose-1,5-2P, and two are released as free phosphates.
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Ribulose 1,5-bisphosphate
Ribulose 1,5-bisphosphate (RuBP) is an organic substance that is involved in photosynthesis, notably as the principal acceptor in plants. It is a colourless anion, a double phosphate ester of the ketopentose (ketone-containing sugar with five carbon atoms) called ribulose.
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carboxy-
carboxy- (kɑːˈbɒksɪ) comb. form of carboxyl; as in carboxy-hæmoglobin, a combination of carbon monoxide and hæmoglobin formed in the blood when carbon monoxide is inhaled; carboxy-(poly)peptidase, an enzyme (e.g. in the pancreas) that hydrolyses peptides and polypeptides by removing the amino acids ...
Oxford English Dictionary
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L-ribulose-5-phosphate 4-epimerase
In enzymology, a L-ribulose-5-phosphate 4-epimerase () is an enzyme that catalyzes the interconversion of ribulose 5-phosphate and xylulose 5-phosphate Other names in common use include phosphoribulose isomerase, ribulose phosphate 4-epimerase, L-ribulose-phosphate 4-epimerase, L-ribulose 5-phosphate 4
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L-ribulose-5-phosphate 3-epimerase
In enzymology, a L-ribulose-5-phosphate 3-epimerase () is an enzyme that catalyzes the chemical reaction
L-ribulose 5-phosphate L-xylulose 5-phosphate The systematic name of this enzyme class is L-ribulose-5-phosphate 3-epimerase.
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Ribulose 5-phosphate
In plants, Ribulose 5-phosphate produced from the pentose-phosphate pathway is converted into Ribulose-1-5-bisphosphate by the enzyme phosphoribokinase See also
Ribulose
Ribulose-1,5-bisphosphate
Organophosphates
Monosaccharide derivatives
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D-ribulokinase
In enzymology, a D-ribulokinase () is an enzyme that catalyzes the chemical reaction
ATP + D-ribulose ADP + D-ribulose 5-phosphate
Thus, the two substrates of this enzyme are ATP and D-ribulose, whereas its two products are ADP and D-ribulose 5-phosphate.
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L-arabinitol 2-dehydrogenase
The systematic name of this enzyme class is L-arabinitol:NAD+ 2-oxidoreductase (L-ribulose-forming). Other names in common use include L-arabinitol dehydrogenase (ribulose-forming), and L-arabinitol (ribulose-forming) dehydrogenase.
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Phosphogluconate dehydrogenase (decarboxylating)
enzymology, a phosphogluconate dehydrogenase (decarboxylating) () is an enzyme that catalyzes the chemical reaction
6-phospho-D-gluconate + NADP+ D-ribulose Then, the intermediate is decarboxylated, yielding a 1,2-enediol of ribulose 5-phosphate, which tautomerizes to form ribulose 5-phosphate.
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(Ribulose-bisphosphate carboxylase)-lysine N-methyltransferase
+ [ribulose-1,5-bisphosphate carboxylase]-lysine S-adenosyl-L-homocysteine + [ribulose-1,5-bisphosphate carboxylase]-N-methyl-L-lysine
Thus, the two Other names in common use include rubisco methyltransferase, ribulose-bisphosphate-carboxylase/oxygenase N-methyltransferase, ribulose-1,5-bisphosphate
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D-arabinitol 2-dehydrogenase
The systematic name of this enzyme class is D-arabinitol:NAD+ 2-oxidoreductase (D-ribulose-forming). This enzyme is also called D-arabinitol 2-dehydrogenase (ribulose-forming).
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L-arabinose isomerase
In enzymology, a L-arabinose isomerase () is an enzyme that catalyzes the chemical reaction
L-arabinose L-ribulose
Hence, this enzyme has one substrate , L-arabinose, and one product, L-ribulose.
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