Pentatricopeptide repeat protein PHOTOSYSTEM I BIOGENESIS FACTOR2 is required for splicing of ycf3. Issue 11 (15th May 2020)

• Record Type: Journal Article
• Authors: Wang, Xuemei; Yang, Zhipan; Zhang, Yi; Zhou, Wen; Zhang, Aihong; Lu, Congming
• Is Part Of: Journal of integrative plant biology. Volume 62:Issue 11(2020)
• Page Start: 1741
• Page End: 1761
• Publication Date: 2020-05-15
• Subjects: chloroplast -- group II intron -- P‐class pentatricopeptide repeat protein -- splicing -- ycf3 intron 1; Plants -- Periodicals; Plants -- China -- Periodicals; Electronic journals; 580.5
• DOI: 10.1111/jipb.12936
• Languages: English
• ISSNs: 1672-9072

Abstract

Abstract: To gain a better understanding of the molecular mechanisms of photosystem I (PSI) biogenesis, we characterized the Arabidopsis thaliana photosystem I biogenesis factor 2 ( pbf2 ) mutant, which lacks PSI complex. PBF2 encodes a P‐class pentatricopeptide repeat (PPR) protein. In the pbf2 mutants, we observed a striking decrease in the transcript level of only one gene, the chloroplast gene ycf3, which is essential for PSI assembly. Further analysis of ycf3 transcripts showed that PBF2 is specifically required for the splicing of ycf3 intron 1. Computational prediction of binding sequences and electrophoretic mobility shift assays reveal that PBF2 specifically binds to a sequence in ycf3 intron 1. Moreover, we found that PBF2 interacted with two general factors for group II intron splicing CHLOROPLAST RNA SPLICING2‐ASSOCIATED FACTOR1 (CAF1) and CAF2, and facilitated the association of these two factors with ycf3 intron 1. Our results suggest that PBF2 is specifically required for the splicing of ycf3 intron 1 through cooperating with CAF1 and CAF2. Our results also suggest that additional proteins are required to contribute to the specificity of CAF‐dependent group II intron splicing. Abstract : A P‐class pentatricopeptide repeat protein is specifically required for intron 1 splicing of chloroplast gene ycf3 through cooperating with two general factors CAF1 and CAF2 for group II intron splicing. This finding indicates that additional proteins are required to contribute to the specificity of CAF‐dependent group II intron splicing.