Local Structural Modification of Ca2+-Depleted Photosystem II Detected by Proton Matrix ENDOR

Nagashima, Hiroki; Mino, Hiroyuki

doi:10.1007/s00723-018-1006-1

Cited by 1 publication

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“…All the transitions of the Kok-Joliot cycle, except the S 0 -to-S 1 transition, are inhibited in the absence of a calcium ion [31]. Removal of the calcium ion reveals that it is not essential for the OEC structure [32,33], although some changes in the hydrogen bonding of water molecules take place [34]. So, what is the function of Ca 2+ ?…”

Section: The Role Of Calciummentioning

confidence: 99%

Photosynthetic Production of Molecular Oxygen by Water Oxidation

Björn

2022

Oxygen

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This review deals with the production of oxygen by photo-oxidation of water, which is a topic fitting a journal devoted to oxygen. Most of the present biosphere, including mankind, depends on oxygen. Elucidating the mechanism is of importance for solving the present energy crisis. Photosynthesis evolved in bacteria, first in a form that did not produce oxygen. The oxygen-producing version arose with the advent of cyanobacteria about three billion years ago. The production of oxygen by photo-oxidation of water requires the co-operative action of four photons. These are harvested from daylight by chlorophyll and other pigments (e.g., phycobiliproteins) and are channeled to photosystem II and photosystem I. The oxygen-evolving complex resides in photosystem II, surrounded by protein subunits, and contains one ion of calcium, four ions of manganese, and a number of oxygen atoms. For each quantum of energy it receives from absorbed light, it proceeds one step through a cycle of states known as the Kok–Joliot cycle. For each turn of the cycle, one molecule of oxygen (O2) is produced.

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Section: The Role Of Calciummentioning

confidence: 99%

Photosynthetic Production of Molecular Oxygen by Water Oxidation

Björn

2022

Oxygen

View full text Add to dashboard Cite

show abstract

Local Structural Modification of Ca2+-Depleted Photosystem II Detected by Proton Matrix ENDOR

Cited by 1 publication

References 52 publications

Photosynthetic Production of Molecular Oxygen by Water Oxidation

Photosynthetic Production of Molecular Oxygen by Water Oxidation

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