Calvin-Benson Cycle EC Ribulose-1,5-bisphosphate carboxylase 4.1.1.39 oxygenase Enzyme Phosphoglyderate Kinase glyceraldehyde 3-phosphate dehydrogenase Triose phosphate Isomerase aldolase Transketolase Phophopentose Isomerase Phosphopentose epimerase phosphoribulokinease 2.7.2.3 1.2.1.12 5.3.1.1 4.1.2.13 2.2.1.1 5.1.3.1 5.1.3.1 2.7.1.19 AG (kJ/mol) Ribulose-1,5-bisphosphate + +70.0 Reaction |CO,+H,O 2(3-phosphoglycerate) +H* Ribulose-1,5-bisphosphate + O₂ + H₂O → 3-phosphoglycerate + 2-phosphoglycolate+H* Cofactors Mg, cobalamin (B₁₂), coenzyme-A, NADH+H* Fe-S clusters, and possibly ATP Regulation Ribulose-1,5-bisphosphate (RuBP) behaves as an inhibitor by strongly binding to the activated form of the enzyme (ECM) Rubisco activase catalyzes the dissociation of RuBP from ECM Notes Rubisco is very inefficient as a carboxylase Photosynthetic efficiency is also reduced if the enzyme acts as an oxygenase It is probably the most abundant protein on earth; up to 50% of leaf protein is rubisco (Feller et al., 2008)

Calvin-Benson Cycle EC Ribulose-1,5-bisphosphate carboxylase 4.1.1.39 oxygenase Enzyme Phosphoglyderate Kinase glyceraldehyde 3-phosphate dehydrogenase Triose phosphate Isomerase aldolase Transketolase Phophopentose Isomerase Phosphopentose epimerase phosphoribulokinease 2.7.2.3 1.2.1.12 5.3.1.1 4.1.2.13 2.2.1.1 5.1.3.1 5.1.3.1 2.7.1.19 AG (kJ/mol) Ribulose-1,5-bisphosphate + +70.0 Reaction |CO,+H,O 2(3-phosphoglycerate) +H* Ribulose-1,5-bisphosphate + O₂ + H₂O → 3-phosphoglycerate + 2-phosphoglycolate+H* Cofactors Mg, cobalamin (B₁₂), coenzyme-A, NADH+H* Fe-S clusters, and possibly ATP Regulation Ribulose-1,5-bisphosphate (RuBP) behaves as an inhibitor by strongly binding to the activated form of the enzyme (ECM) Rubisco activase catalyzes the dissociation of RuBP from ECM Notes Rubisco is very inefficient as a carboxylase Photosynthetic efficiency is also reduced if the enzyme acts as an oxygenase It is probably the most abundant protein on earth; up to 50% of leaf protein is rubisco (Feller et al., 2008)

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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