Plastid genome undoubtedly originates from the genome of a cyanobacterium-like endosymbiont. However, the plastid genomic machinery as a whole might not be totally prokaryotic. A combination of comprehensive genomic database search and protein analysis of isolated nucleoids from various plants and algae suggests that the major DNA-binding proteins of nucleoids have been radically replaced during the evolution of green algae and plants after the endosymbiosis event. This is consistent with the hypothesis of discontinuous evolution of plastid genomic machinery.
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