Discuss evolutionary factors that led to the emergence of
PEPcarboxylase. (Mention C4 and CAM plants)
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Biology
Discuss evolutionary factors that led to the emergence ofPEPcarboxylase. (Mention C4 and CAM plants)
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first we need to know about Rubisco and Photorespiration Rubisco The enzyme ribulose bisphosphate carboxylaseoxygenase Rubisco is the most abundant protein on Earth It is an enzyme that catalyses the carbon fixing step at the beginning of the Calvin cycleC3 Cycle It is possibly the most important molecule on the planet Almost every carbon atom in every organic molecule in every cell of every living organism has been through the active site of this molecule Others have been fixed by photosynthetic bacteria Photorespiration There is a problem When ribulose15biphopshate RuBP is carboxylated it reacts with carbon dioxide and water to give two glycerate3phosphate GP molecules which can be utilised in the C3 Calvin cycle But this reaction is very slow at low carbon dioxide concentrations Rubisco also catalyses another reaction the oxygenation of RuBP When RuBP reacts with oxygen it gives a molecule of GP and another of
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