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PPR-DYW Protein EMP17 Is Required for Mitochondrial RNA Editing, Complex III Biogenesis, and Seed Development in Maize.
- Source :
-
Frontiers in plant science [Front Plant Sci] 2021 Jul 28; Vol. 12, pp. 693272. Date of Electronic Publication: 2021 Jul 28 (Print Publication: 2021). - Publication Year :
- 2021
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Abstract
- The conversion of cytidines to uridines (C-to-U) at specific sites in mitochondrial and plastid transcripts is a post-transcriptional processing event that is important to the expression of organellar genes. Pentatricopeptide repeat (PPR) proteins are involved in this process. In this study, we report the function of a previously uncharacterized PPR-DYW protein, Empty pericarp17 (EMP17), in the C-to-U editing and kernel development in maize. EMP17 is targeted to mitochondria. The loss-function of EMP17 arrests maize kernel development, abolishes the editing at ccmF <subscript> C </subscript> -799 and nad2 -677 sites, and reduces the editing at ccmF <subscript> C </subscript> -906 and -966 sites. The absence of editing causes amino acid residue changes in CcmF <subscript>C</subscript> -267 (Ser to Pro) and Nad2-226 (Phe to Ser), respectively. As CcmF <subscript>C</subscript> functions in cytochrome c (Cyt c ) maturation, the amount of Cyt c and Cyt c <subscript>1</subscript> protein is drastically reduced in emp17 , suggesting that the CcmF <subscript>C</subscript> -267 (Ser to Pro) change impairs the CcmF <subscript>C</subscript> function. As a result, the assembly of complex III is strikingly decreased in emp17 . In contrast, the assembly of complex I appears less affected, suggesting that the Nad2-226 (Phe to Ser) change may have less impact on Nad2 function. Together, these results indicate that EMP17 is required for the C-to-U editing at several sites in mitochondrial transcripts, complex III biogenesis, and seed development in maize.<br />Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.<br /> (Copyright © 2021 Wang, Liu, Huang, Li, Yang, Sayyed, Sun, Gu, Wang and Tan.)
Details
- Language :
- English
- ISSN :
- 1664-462X
- Volume :
- 12
- Database :
- MEDLINE
- Journal :
- Frontiers in plant science
- Publication Type :
- Academic Journal
- Accession number :
- 34394147
- Full Text :
- https://doi.org/10.3389/fpls.2021.693272