An RNA Chaperone-Like Protein Plays Critical Roles in Chloroplast MRNA Stability and Translation in Arabidopsis and Maize

Overview

Journal Plant Cell

Publisher Oxford University Press

Specialties Biology
Cell Biology

Date 2019 Apr 10

PMID 30962391

Citations 11

Authors

Jingjing Jiang

Xin Chai

Nikolay Manavski

Rosalind Williams-Carrier

Baoye He

Andreas Brachmann

Daili Ji

Min Ouyang

Yini Liu

Alice Barkan

Jorg Meurer

Lixin Zhang

Wei Chi

Affiliations

Soon will be listed here.

Abstract

A key characteristic of chloroplast gene expression is the predominance of posttranscriptional control via numerous nucleus-encoded RNA binding factors. Here, we explored the essential roles of the S1-domain-containing protein ()/ Stabilizing Factor (BSF) in the stabilization and translation of chloroplast mRNAs. BSF binds to the intergenic region of -, thereby stabilizing 3' processed transcripts and stimulating translation. BSF also binds to the 5' untranslated region of and activates its translation. BSF displayed nucleic-acid-melting activity in vitro, and its absence induces structural changes to target RNAs in vivo, suggesting that BSF functions as an RNA chaperone to remodel RNA structure. BSF physically interacts with the pentatricopeptide repeat protein Chloroplast RNA Processing 1 (AtCRP1) and the ribosomal release factor-like protein Peptide chain Release Factor 3 (PrfB3), whose established RNA ligands overlap with those of BSF. In addition, PrfB3 stimulated the RNA binding ability of BSF in vitro. We propose that BSF and PrfB3 cooperatively reduce the formation of secondary RNA structures within target mRNAs and facilitate AtCRP1 binding. The translation activation function of BSF for is conserved in Arabidopsis () and maize (), but that for operates specifically in Arabidopsis. Our study sheds light on the mechanisms by which RNA binding proteins cooperatively regulate mRNA stability and translation in chloroplasts.

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