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Transcription. 2012 Nov-Dec;3(6):290-4. doi: 10.4161/trns.21810. Epub 2012 Aug 14.

Evolutionary aspects of plastid proteins involved in transcription: the transcription of a tiny genome is mediated by a complicated machinery.

Author information

1
Faculty of Agriculture, Kyushu University, Fukuoka, Japan.

Abstract

Chloroplasts in land plants have a small genome consisting of only 100 genes encoding partial sets of proteins for photosynthesis, transcription and translation. Although it has been thought that chloroplast transcription is mediated by a basically cyanobacterium-derived system, due to the endosymbiotic origin of plastids, recent studies suggest the existence of a hybrid transcription machinery containing non-bacterial proteins that have been newly acquired during plant evolution. Here, we highlight chloroplast-specific non-bacterial transcription mechanisms by which land plant chloroplasts have gained novel functions.

KEYWORDS:

NEP; PEP; chloroplast; nucleoid; pTAC

PMID:
22889841
PMCID:
PMC3630183
DOI:
10.4161/trns.21810
[Indexed for MEDLINE]
Free PMC Article
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