ArticleOrigins of life and evolution of the biosphere : the journal of the International Society for the Study of the Origin of Life2011
Amorphous manganese-calcium oxides as a possible evolutionary origin for the CaMn₄ cluster in photosystem II.
Article in Origins of life and evolution of the biosphere : the journal of the International Society for the Study of the Origin of Life, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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5 citing papers in PubMed, 58 citations in OpenAlex.
- Bound manganese oxides capable of reducing the bacteriochlorophyll dimer of modified reaction centers from Rhodobacter sphaeroides.Photosynthesis research · 2020Article
- An approach for catalyst design in artificial photosynthetic systems: focus on nanosized inorganic cores within proteins.Photosynthesis research · 2013Review
- Biomineralization: a proposed evolutionary origin for inorganic cofactors of enzymes.Theory in biosciences = Theorie in den Biowissenschaften · 2012Article
- Nano-sized manganese oxides as biomimetic catalysts for water oxidation in artificial photosynthesis: a review.Journal of the Royal Society, Interface · 2012Review
- Biological water-oxidizing complex: a nano-sized manganese-calcium oxide in a protein environment.Photosynthesis research · 2012Review
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Abstract
In this paper a few calcium-manganese oxides and calcium-manganese minerals are studied as catalysts for water oxidation. The natural mineral marokite is also studied as a catalyst for water oxidation for the first time. Marokite is made up of edge-sharing Mn(3+) in a distorted octahedral environment and eight-coordinate Ca(2+) centered polyhedral layers. The structure is similar to recent models of the oxygen evolving complex in photosystem II. Thus, the oxygen evolving complex in photosystem II does not have an unusual structure and could be synthesized hydrothermally. Also in this paper, oxygen evolution is studied with marokite (CaMn₂O₄), pyrolusite (MnO₂) and compared with hollandite (Ba(0.2)Ca(0.15)K(0.3)Mn(6.9)Al(0.2)Si(0.3)O(16)), hausmannite (Mn₃O₄), Mn₂O₃.H₂O, Ca Mn₃O₆.H₂O, CaMn₄O₈.H₂O, CaMn₂O₄.H₂O and synthetic marokite (CaMn₂O₄). I propose that the origin of the oxygen evolving complex in photosystem II resulted from absorption of calcium and manganese ions that were precipitated together in the archean oceans by protocyanobacteria because of changing pH from ~5 to ~8-10. As reported in this paper, amorphous calcium-manganese oxides with different ratios of manganese and calcium are effective catalysts for water oxidation. The bond types and lengths of the calcium and manganese ions in the calcium-manganese oxides are directly comparable to those in the OEC. This primitive structure of these amorphous calcium-manganese compounds could be changed and modified by environmental groups (amino acids) to form the oxygen evolving complex in photosystem II.
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