The evolutionary origin of mitochondrial metabolite carriers
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121 - 130
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The nature of the transport systems of mitochondria and eubacteria are compared in order to determine what changes are likely to have been required in the evolution of mitochondria from free-living ancestors resembling present-day eubacteria, as envisaged by the serial endosymbiosis theory of the origin of the eukaryotic cell. The presence of exchange diffusion carriers in eubacteria (particularly the adenine nucleotide carrier of Rickettsia prouazekii) demonstrates the remarkable adaptability of eubacterial transport systems in relation to the nutritional possibilities of their environment. It is suggested that some of the mitochondrial carriers could have evolved from carriers already present in their eubacterial ancestors.
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