What does phosphoribulokinase mean?
Definitions for phosphoribulokinase
phos·pho·ribu·lok·i·nase
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Wikipedia
Phosphoribulokinase
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 CO2-acceptor molecule of the Calvin Cycle. PRK belongs to the family of transferase enzymes, specifically those transferring phosphorus-containing groups (phosphotransferases) to an alcohol group acceptor. Along with ribulose 1,5-bisphosphate carboxylase/oxygenase (RuBisCo), phosphoribulokinase is unique to the Calvin Cycle. Therefore, PRK activity often determines the metabolic rate in organisms for which carbon fixation is key to survival. Much initial work on PRK was done with spinach leaf extracts in the 1950s; subsequent studies of PRK in other photosynthetic prokaryotic and eukaryotic organisms have followed. The possibility that PRK might exist was first recognized by Weissbach et al. in 1954; for example, the group noted that carbon dioxide fixation in crude spinach extracts was enhanced by the addition of ATP. The first purification of PRK was conducted by Hurwitz and colleagues in 1956.ATP + Mg2+ - D-ribulose 5-phosphate ⇌ {\displaystyle \rightleftharpoons } ADP + D-ribulose 1,5-bisphosphate The two substrates of PRK are ATP and D-ribulose 5-phosphate, whereas its two products are ADP and D-ribulose 1,5-bisphosphate. PRK activity requires the presence of a divalent metal cation like Mg2+, as indicated in the reaction above.
Numerology
Chaldean Numerology
The numerical value of phosphoribulokinase in Chaldean Numerology is: 9
Pythagorean Numerology
The numerical value of phosphoribulokinase in Pythagorean Numerology is: 8
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"phosphoribulokinase." Definitions.net. STANDS4 LLC, 2024. Web. 27 Apr. 2024. <https://www.definitions.net/definition/phosphoribulokinase>.
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