Bicarbonate use and carbon dioxide concentrating mechanisms in photosynthetic organisms

Photosynthesis is crucial to the reduction of carbon dioxide in the atmosphere. The key enzyme of photosynthesis, Ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco), has two mutably competing substrates, CO 2 and O 2. It has features of carboxylase and oxygenase. Rubisco performs the function...

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Bibliographic Details
Published in:Acta geochimica 2021-10, Vol.40 (5), p.846-853
Main Author: Wu, Yanyou
Format: Article
Language:English
Subjects:
Adenosine triphosphatase
Bicarbonates
Carbon dioxide
Carbon fixation
Chemical evolution
Dehydration
Earth and Environmental Science
Earth Sciences
Extracellular
Geochemistry
H+-transporting ATPase
Inorganic carbon
Membranes
Oxygenase
Photosynthesis
Ribulose-1,5-bisphosphate
Ribulose-bisphosphate carboxylase
Short Communication
Substrates
Thylakoid membranes
Uptake
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Summary:Photosynthesis is crucial to the reduction of carbon dioxide in the atmosphere. The key enzyme of photosynthesis, Ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco), has two mutably competing substrates, CO 2 and O 2. It has features of carboxylase and oxygenase. Rubisco performs the function of carboxylase to reduce inorganic carbon to form organic substances, which precondition is that more carbon dioxide accumulates around it. Carbon dioxide concentrating mechanisms (CCMs) are vital to cope with the limit of carbon dioxide. Various bicarbonate use pathway has a differential contribution to inorganic carbon assimilation. Bicarbonate transport, extracellular bicarbonate dehydration, or H + -ATPase-driven bicarbonate uptake, which induced CCMs, can support a considerable share of photosynthesis in photosynthetic organisms. However, CCMs in thylakoid membranes may be the most important. The CCMs occurred in the plasma membrane were secondary, evolutionary, and inducible, while CCMs coupled with photosynthetic oxygen evolution in thylakoid membranes, were primitive, major, and indispensable. A hypothetical schematic model of CCMs occurred in the plasma membrane and thylakoid membranes being proposed.
ISSN:2096-0956
2365-7499
DOI:10.1007/s11631-021-00488-w