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The Calvin cycle, light-independent reactions, bio synthetic phase, dark reactions, or photosynthetic carbon reduction (PCR) cycle [1] of photosynthesis is a series of chemical reactions that convert carbon dioxide and hydrogen-carrier compounds into glucose. The Calvin cycle is present in all photosynthetic eukaryotes and also many ...
Microbial metabolism is the means by which a microbe obtains the energy and nutrients (e.g. carbon) it needs to live and reproduce.Microbes use many different types of metabolic strategies and species can often be differentiated from each other based on metabolic characteristics.
Unlike the other assimilatory pathways, bacteria using the RuBP pathway derive all of their organic carbon from assimilation. [5] [19] This pathway was first elucidated in photosynthetic autotrophs and is better known as the Calvin Cycle.
This epimerase participates in the third phase of the Calvin cycle, which involves the regeneration of ribulose 1,5-bisphosphate. RuBP is the acceptor of the carbon dioxide (CO 2) in the first step of the pathway, which suggests that phosphopentose epimerase regulates flux through the Calvin cycle. Without the regeneration of ribulose 1,5 ...
The reverse Krebs cycle, also known as the reverse TCA cycle (rTCA) or reductive citric acid cycle, is an alternative to the standard Calvin-Benson cycle for carbon fixation. It has been found in strict anaerobic or microaerobic bacteria (as Aquificales ) and anaerobic archea .
Reaction catalyzed by sedoheptulose-bisphosphatase. SBPase is involved in the regeneration of 5-carbon sugars during the Calvin cycle. Although SBPase has not been emphasized as an important control point in the Calvin cycle historically, it plays a large part in controlling the flux of carbon through the Calvin cycle. [9]
Transketolase (abbreviated as TK) is an enzyme that, in humans, is encoded by the TKT gene. [1] It participates in both the pentose phosphate pathway in all organisms and the Calvin cycle of photosynthesis. Transketolase catalyzes two important reactions, which operate in opposite directions in these two pathways.
Once NADPH has been produced, the Calvin cycle [1] proceeds as in oxygenic photosynthesis, turning CO 2 into glucose. Anoxygenic photosynthesis is a special form of photosynthesis used by some bacteria and archaea , which differs from the better known oxygenic photosynthesis in plants in the reductant used (e.g. hydrogen sulfide instead of ...