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- W2098999600 endingPage "2007" @default.
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- W2098999600 abstract "Photosynthesis was established on Earth more than 3 billion years ago. All available evidences suggest that the earliest photosynthetic organisms were anoxygenic and that oxygen-evolving photosynthesis is a more recent development. The reaction center complexes that form the heart of the energy storage process are integral membrane pigment proteins that span the membrane in vectorial fashion to carry out electron transfer. The origin and extent of distribution of these proteins has been perplexing from a phylogenetic point of view mostly because of extreme sequence divergence. A series of integral membrane proteins of known structure and varying degrees of sequence identity have been compared using combinatorial extension–Monte Carlo methods. The proteins include photosynthetic reaction centers from proteobacteria and cyanobacterial photosystems I and II, as well as cytochrome oxidase, bacteriorhodopsin, and cytochrome b. The reaction center complexes show a remarkable conservation of the core structure of 5 transmembrane helices, strongly implying common ancestry, even though the residual sequence identity is less than 10%, whereas the other proteins have structures that are unrelated. A relationship of sequence with structure was derived from the reaction center structures; with characteristic decay length of 1.6 Å. Phylogenetic trees derived from the structural alignments give insights into the earliest photosynthetic reaction center, strongly suggesting that it was a homodimeric complex that did not evolve oxygen." @default.
- W2098999600 created "2016-06-24" @default.
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- W2098999600 date "2006-08-03" @default.
- W2098999600 modified "2023-10-11" @default.
- W2098999600 title "Conservation of Distantly Related Membrane Proteins: Photosynthetic Reaction Centers Share a Common Structural Core" @default.
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- W2098999600 doi "https://doi.org/10.1093/molbev/msl079" @default.
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