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Ribulose-1,5-bisphosphate carboxylase oxygenase A 3d depiction of the activated RuBisCO from spinach in open form with active site accessible. The active site Lys175 residues are marked in pink, and a close-up of the residue is provided to the right for one of the monomers composing the enzyme.
The enzyme ribulose-1,5-bisphosphate carboxylase-oxygenase catalyzes the reaction between RuBP and carbon dioxide.The product is the highly unstable six-carbon intermediate known as 3-keto-2-carboxyarabinitol 1,5-bisphosphate, or 2'-carboxy-3-keto-D-arabinitol 1,5-bisphosphate (CKABP). [8]
In enzymology, a [ribulose-bisphosphate carboxylase]-lysine N-methyltransferase (EC 2.1.1.127) is an enzyme that catalyzes the chemical reaction S-adenosyl-L-methionine + [ribulose-1,5-bisphosphate carboxylase]-lysine ⇌ {\displaystyle \rightleftharpoons } S-adenosyl-L-homocysteine + [ribulose-1,5-bisphosphate carboxylase]-N 6 -methyl-L-lysine
The kinetic isotope effect (KIE) of ribulose-1,5-bisphosphate carboxylase oxygenase is the isotopic fractionation associated solely with the step in the Calvin-Benson cycle where a molecule of carbon dioxide (CO 2) is attached to the 5-carbon sugar ribulose-1,5-bisphosphate (RuBP) to produce two 3-carbon sugars called 3-phosphoglycerate (3 PGA).
Calvin–Benson cycle. C 3 carbon fixation is the most common of three metabolic pathways for carbon fixation in photosynthesis, the other two being C 4 and CAM.This process converts carbon dioxide and ribulose bisphosphate (RuBP, a 5-carbon sugar) into two molecules of 3-phosphoglycerate through the following reaction:
Phosphoribulokinase (PRK) (EC 2.7.1.19) is an essential photosynthetic enzyme that catalyzes the ATP-dependent phosphorylation of ribulose 5-phosphate (RuP) into ribulose 1,5-bisphosphate (RuBP), both intermediates in the Calvin Cycle. Its main function is to regenerate RuBP, which is the initial substrate and CO 2-acceptor molecule of the ...
[1] Carboxysomes are bacterial microcompartments (BMCs) consisting of polyhedral protein shells filled with the enzymes ribulose-1,5-bisphosphate carboxylase/oxygenase ( RuBisCO )—the predominant enzyme in carbon fixation and the rate limiting enzyme in the Calvin cycle —and carbonic anhydrase .
Bisphosphate may refer to the following enzymes: (ribulose-bisphosphate carboxylase)-lysine N-methyltransferase (EC 2.1.1.127), an enzyme that catalyzes the chemical reaction S-adenosyl-L-methionine + [ribulose-1,5-bisphosphate carboxylase]-lysine S-adenosyl-L-homocysteine + [ribulose-1,5-bisphosphate carboxylase]-N6-methyl-L-lysine
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