Evolution of Photosystem I and the Control of Global Enthalpy in an Oxidizing World

Overview

Journal Photosynth Res

Publisher Springer

Date 2013 Aug 20

PMID 23954951

Citations 12

Authors

Nathan Nelson

Affiliations

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Abstract

Life on earth is governed by light, chemical reactions, and the second law of thermodynamics, which defines the tendency for increasing entropy as an expression of disorder or randomness. Life is an expression of increasing order, and a constant influx of energy and loss of entropic wastes are required to maintain or increase order in living organisms. Most of the energy for life comes from sunlight and, thus, photosynthesis underlies the survival of all life forms. Oxygenic photosynthesis determines not only the global amount of enthalpy in living systems, but also the composition of the Earth's atmosphere and surface. Photosynthesis was established on the Earth more than 3.5 billion years ago. The primordial reaction center has been suggested to comprise a homodimeric unit resembling the core complex of the current reaction centers in Chlorobi, Heliobacteria, and Acidobacteria. Here, an evolutionary scenario based on the known structures of the current reaction centers is proposed.

Citing Articles

Identification and characterization of the low molecular mass ferredoxins involved in central metabolism in Heliomicrobium modesticaldum.

Walters K, Redding K, Golbeck J Photosynth Res. 2024; 162(2-3):251-271.

PMID: 38306001 DOI: 10.1007/s11120-023-01069-z.

Coupling and Slips in Photosynthetic Reactions-From Femtoseconds to Eons.

Nelson N Plants (Basel). 2023; 12(22).

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Structure of Photosystem I Supercomplex Isolated from a Cytochrome b6f Temperature-Sensitive Mutant.

Schwartz T, Fadeeva M, Klaiman D, Nelson N Biomolecules. 2023; 13(3).

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Current state of the primary charge separation mechanism in photosystem I of cyanobacteria.

Cherepanov D, Semenov A, Mamedov M, Aybush A, Gostev F, Shelaev I Biophys Rev. 2022; 14(4):805-820.

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Dimeric and high-resolution structures of Chlamydomonas Photosystem I from a temperature-sensitive Photosystem II mutant.

Caspy I, Schwartz T, Bayro-Kaiser V, Fadeeva M, Kessel A, Ben-Tal N Commun Biol. 2021; 4(1):1380.

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