Two organelle RNA recognition motif proteins affect distinct sets of RNA editing sites in the Arabidopsis thaliana plastid.

Autor: Searing AM; Department of Biological Sciences Western Michigan University Kalamazoo MI USA., Satyanarayan MB; Department of Biological Sciences Western Michigan University Kalamazoo MI USA., O Donnell JP; Department of Biological Sciences Western Michigan University Kalamazoo MI USA., Lu Y; Department of Biological Sciences Western Michigan University Kalamazoo MI USA.
Jazyk: angličtina
Zdroj: Plant direct [Plant Direct] 2020 Apr 06; Vol. 4 (4), pp. e00213. Date of Electronic Publication: 2020 Apr 06 (Print Publication: 2020).
DOI: 10.1002/pld3.213
Abstrakt: Plastid and mitochondrial RNAs in vascular plants are subjected to cytidine-to-uridine editing. The model plant species Arabidopsis thaliana (Arabidopsis) has two nuclear-encoded plastid-targeted organelle RNA recognition motif (ORRM) proteins: ORRM1 and ORRM6. In the orrm1 mutant, 21 plastid RNA editing sites were affected but none are essential to photosynthesis. In the orrm6 mutants, two plastid RNA editing sites were affected: psbF -C77 and accD -C794. Because psbF encodes the β subunit of cytochrome b 559 in photosystem II, which is essential to photosynthesis, the orrm6 mutants were much smaller than the wild type. In addition, the orrm6 mutants had pale green leaves and reduced photosynthetic efficiency. To investigate the functional relationship between ORRM1 and ORRM6, we generated orrm1 orrm6 double homozygous mutants. Morphological and physiological analyses showed that the orrm1 orrm6 double mutants had a smaller plant size, reduced chlorophyll contents, and decreased photosynthetic efficiency, similar to the orrm6 single mutants. Although the orrm1 orrm6 double mutants adopted the phenotype of the orrm6 single mutants, the total number of plastid RNA editing sites affected in the orrm1 orrm6 double mutants was the sum of the sites affected in the orrm1 and orrm6 single mutants. These data suggest that ORRM1 and ORRM6 are in charge of distinct sets of plastid RNA editing sites and that simultaneous mutations in ORRM1 and ORRM6 genes do not cause additional reduction in editing extent at other plastid RNA editing sites.
(2020 The Authors. Plant Direct published by American Society of Plant Biologists and the Society for Experimental Biology and John Wiley & Sons Ltd.)
Databáze: MEDLINE
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