Structural highlights
Publication Abstract from PubMedRNA editing is a post-transcriptional process that modifies the genetic information on RNA molecules. In flowering plants, RNA editing usually alters cytidine to uridine in plastids and mitochondria. The PLS-type pentatricopeptide repeat (PPR) protein and the multiple organellar RNA editing factor (MORF, also known as RNA editing factor interacting protein (RIP)) are two types of key trans-acting factors involved in this process. However, how they cooperate with one another remains unclear. Here, we have characterized the interactions between a designer PLS-type PPR protein (PLS)3PPR and MORF9, and found that RNA-binding activity of (PLS)3PPR is drastically increased on MORF9 binding. We also determined the crystal structures of (PLS)3PPR, MORF9 and the (PLS)3PPR-MORF9 complex. MORF9 binding induces significant compressed conformational changes of (PLS)3PPR, revealing the molecular mechanisms by which MORF9-bound (PLS)3PPR has increased RNA-binding activity. Similarly, increased RNA-binding activity is observed for the natural PLS-type PPR protein, LPA66, in the presence of MORF9. These findings significantly expand our understanding of MORF function in plant organellar RNA editing. MORF9 increases the RNA-binding activity of PLS-type pentatricopeptide repeat protein in plastid RNA editing.,Yan J, Zhang Q, Guan Z, Wang Q, Li L, Ruan F, Lin R, Zou T, Yin P Nat Plants. 2017 Apr 10;3:17037. doi: 10.1038/nplants.2017.37. PMID:28394309[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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