A carbonic anhydrase inhibitor induces bicarbonate-reversible suppression of electron transfer in pea photosystem 2 membrane fragments

Шитов, А. В.; Zharmukhamedov, Sergey K.; Shutova, Tatiana; Allakhverdiev, Suleyman I.; Samuelsson, Göran; Klimov, Vyacheslav V.

doi:10.1016/j.jphotobiol.2011.04.001

Cited by 23 publications

(22 citation statements)

References 38 publications

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“…Acetazolamide inhibits photosynthetic electron transfer in Photosystem II and the acetazolamide-induced inhibition is totally reversed by the addition of bicarbonate (Shitov et al 2011). Meanwhile, acetazolamide and imidazole suppressed the the photoinduced yield of chlorophyll fluorescence (Pronina et al 2002).…”

Section: Thylakoid Ca Versus Photosynthetic Oxygen Evolutionmentioning

confidence: 99%

Is bicarbonate directly used as substrate to participate in photosynthetic oxygen evolution

2021

Acta Geochim

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If the photosynthetic organisms assimilated only CO2 in the Archean atmosphere, hydroxide ion in the Archean seawater would not increase. If plants would not consume bicarbonate as a direct substrate during photosynthesis, it is difficult to explain the evolution of Earth's environment. To date, it is generally accepted that photosynthetic O2 evolution of plants come from water photolysis. However, it should be debated by evaluating the effect of bicarbonate in photosynthetic O2 evolution, analyzing the role of carbonic anhydrase (CA) in photosynthetic O2 evolution, and the relationship between thylakoid CA and photosynthetic O2 evolution. In the paper, I propose that bicarbonate is directly used as substrate to participate in photosynthetic O2 evolution. The rationality of bicarbonate photolysis of plants is discussed from the thermodynamics and evolution of Earth's environment. The isotopic evidence that bicarbonate is not the direct substrate of photosynthetic O2 release is reexamined, and the new explanation of bicarbonate photolysis in photosynthetic O2 evolution is proposed.

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Section: Thylakoid Ca Versus Photosynthetic Oxygen Evolutionmentioning

confidence: 99%

Is bicarbonate directly used as substrate to participate in photosynthetic oxygen evolution

2021

Acta Geochim

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“…In fact, the extrinsic CA of photosystem II is also affected by acetazolamide due to CA in chloroplast. The response of acetazolamide increasing net photosynthetic O 2 evolution in Enteromorpha intestinalis is similar to that in the extrinsic CA of photosystem II (Larsson et al 1997;Ignatova et al 2006;Shitov et al 2009Shitov et al , 2011. Meanwhile, inhibiting one of bicarbonate use pathways would affect others.…”

Section: Contribution Of Ccms Induced By Bicarbonate Dehydrationmentioning

confidence: 67%

Bicarbonate use and carbon dioxide concentrating mechanisms in photosynthetic organisms

2021

Acta Geochim

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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.

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“…This evidenced that CA activity was needed for maximum PSII activity. Such effects of known inhibitors, acetazolamide and ethoxyzolamide, were discovered long ago [66,67], but as it was later determined, the effects resulted, at least in part, from their ability to non-specifically suppress the electron transport rate in PSII [68,69]. By contrast with acetazolamide, TFMSA influenced the electron transfer rate in PSII only in НСО 3 − /СО 2free medium; adding exogenous bicarbonate, as well as electron donors for PSII, made the inhibiting effect of TFMSA disappear [65].…”

Section: Carbonic Anhydrases In Thylakoids Carbonic Anhydrases In Thylakoid Membranesmentioning

confidence: 99%

Carbonic Anhydrases in Photosynthesizing Cells of C3 Higher Plants

Ignatova¹,

Rudenko²,

Zhurikova³

et al. 2020

Prime Archives in Biochemistry

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A carbonic anhydrase inhibitor induces bicarbonate-reversible suppression of electron transfer in pea photosystem 2 membrane fragments

Cited by 23 publications

References 38 publications

Is bicarbonate directly used as substrate to participate in photosynthetic oxygen evolution

Is bicarbonate directly used as substrate to participate in photosynthetic oxygen evolution

Bicarbonate use and carbon dioxide concentrating mechanisms in photosynthetic organisms

Carbonic Anhydrases in Photosynthesizing Cells of C3 Higher Plants

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