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Ribulose 1,5-bisphosphate (RuBP) is an organic substance that is involved in photosynthesis, notably as the principal CO 2 acceptor in plants. [ 1 ] : 2 It is a colourless anion, a double phosphate ester of the ketopentose ( ketone -containing sugar with five carbon atoms) called ribulose .
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 ...
2-Carboxy-D-arabitinol 1-phosphate (CA1P) is a molecule produced in plants that inhibits RuBisCO, a key enzyme in the Calvin cycle and carbon fixation.In dark conditions, this molecule binds to RuBisCO, preventing it from participating in chemical reactions.
Then, the intermediate is decarboxylated, yielding a 1,2-enediol of ribulose 5-phosphate, which tautomerizes to form ribulose 5-phosphate. [3] High levels of NADPH are believed to inhibit the enzyme, while 6-phosphogluconate acts to activate the enzyme.
In enzymology, a L-arabinitol 2-dehydrogenase (EC 1.1.1.13) is an enzyme that catalyzes the chemical reaction. L-arabinitol + NAD + L-ribulose + NADH + H +. Thus, the two substrates of this enzyme are L-arabinitol and NAD +, whereas its 3 products are L-ribulose, NADH, and H +.
The intestinal enzyme biotinidase, found in pancreatic secretions and in the brush border membranes of all three parts of the small intestine, frees biotin, which is then absorbed from the small intestine. [4] When consumed as a biotin dietary supplement, absorption is nonsaturable, meaning that even very high amounts are absorbed effectively.
As such, in contrast to some other encapsulation materials, the capsules can be used to grow cells and act as such like a mini-bioreactor. The biocompatible nature of the material has been demonstrated by observation during studies using the cell-filled capsules themselves for implantation as well as isolated capsule material. [44]
Vitamin B 6 Drug class Pyridoxal 5'-phosphate, the metabolically active form of vitamin B 6 Class identifiers Use Vitamin B 6 deficiency ATC code A11H Biological target enzyme cofactor Clinical data Drugs.com International Drug Names External links MeSH D025101 Legal status In Wikidata Vitamin B 6 is one of the B vitamins, and is an essential nutrient for humans. The term essential nutrient ...
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