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- W2170502449 endingPage "1952" @default.
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- W2170502449 abstract "Mitochondria originated by permanent enslavement of purple non-sulphur bacteria. These endosymbionts became organelles through the origin of complex protein-import machinery and insertion into their inner membranes of protein carriers for extracting energy for the host. A chicken-and-egg problem exists: selective advantages for evolving import machinery were absent until inner membrane carriers were present, but this very machinery is now required for carrier insertion. I argue here that this problem was probably circumvented by conversion of the symbiont protein-export machinery into protein-import machinery, in three phases. I suggest that the first carrier entered the periplasmic space via pre-existing β-barrel proteins in the bacterial outer membrane that later became Tom40, and inserted into the inner membrane probably helped by a pre-existing inner membrane protein, thereby immediately providing the protoeukaryote host with photosynthesate. This would have created a powerful selective advantage for evolving more efficient carrier import by inserting Tom70 receptors. Massive gene transfer to the nucleus inevitably occurred by mutation pressure. Finally, pressure from harmful, non-selected gene transfer to the nucleus probably caused evolution of the presequence mechanism, and photosynthesis was lost." @default.
- W2170502449 created "2016-06-24" @default.
- W2170502449 creator A5052009320 @default.
- W2170502449 date "2006-04-11" @default.
- W2170502449 modified "2023-10-03" @default.
- W2170502449 title "Origin of mitochondria by intracellular enslavement of a photosynthetic purple bacterium" @default.
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- W2170502449 doi "https://doi.org/10.1098/rspb.2006.3531" @default.
- W2170502449 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1634775" @default.
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- W2170502449 hasPublicationYear "2006" @default.
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