RT Journal Article
SR Electronic
T1 The Pentatricopeptide Repeat Protein SOT5/EMB2279 Is Required for Plastid <em>rpl2</em> and <em>trnK</em> Intron Splicing
JF Plant Physiology
JO Plant Physiol.
FD American Society of Plant Biologists
SP 684
OP 697
DO 10.1104/pp.18.00406
VO 177
IS 2
A1 Huang, Weihua
A1 Zhu, Yajuan
A1 Wu, Wenjuan
A1 Li, Xuan
A1 Zhang, Delin
A1 Yin, Ping
A1 Huang, Jirong
YR 2018
UL http://www.plantphysiol.org/content/177/2/684.abstract
AB Chloroplast biogenesis and development are highly complex processes requiring interaction between plastid and nuclear genomic products. Using a high-throughput screen for chloroplast biogenesis suppressors in Arabidopsis (Arabidopsis thaliana), we identified a suppressor of thf1 (sot5) that displays virescent and serrated leaves. Further characterization revealed that sot5 mutants are defective in leaf adaxial and abaxial polarity and act as enhancers of asymmetric leaves2. Map-based cloning identified SOT5 as a gene previously named EMB2279 that encodes a plastid-targeted pentatricopeptide repeat (PPR) protein with 11 PPR motifs. A G-to-A mutation in sot5 leads to a significant decrease in splicing efficiency, generating two additional mRNA variants. As reported previously, the sot5 null mutation is embryo lethal. SOT5 is predicted to bind to specific RNA sequences found in plastid rpl2 and trnK genes, and we found decreased splicing efficiency of the rpl2 and trnK genes in sot5 mutants. Together, our results reveal that the PPR protein SOT5/EMB2279 is required for intron splicing of plastid rpl2 and trnK, providing insights into the role of plastid translation in the coupled development between chloroplasts and leaves.