4oe1

Publication Abstract from PubMed

Pentatricopeptide repeat (PPR) proteins, particularly abundant in plastids and mitochrondria of angiosperms, include a large number of sequence-specific RNA binding proteins which are involved indiverse aspects of organelle RNA metabolisms. PPR proteins contain multiple tandom repeats and each repeat can specifically recognize a RNA base through residues 2, 5, and 35 in a modular fashion. The crystal structure of PPR10 from maize chloroplast exhibits dimeric existence both in the absence and presence of the 18-nucleotide (nt) psaJ RNA element. However, previous biochemical analysis suggested a monomeric shift of PPR10 upon RNA binding. In this report, we show that the amino-ternimal segments of PPR10 determine the dimerization state of PPR10. A single amino acid alteration of cysteine to serine within repeat 10 of PPR10 further drives dimerization of PPR10. The biochemical elucidation of the determinants for PPR10 dimerization may provide an important foundation to understand the working mechanisms of PPR proteins underlying their diverse physiological functions.

Examination of the Dimerization States of the Single-stranded RNA-recognition Protein PPR10.,Li Q, Yan C, Xu H, Wang Z, Long J, Li W, Wu J, Yin P, Yan N J Biol Chem. 2014 Sep 17. pii: jbc.M114.575472. PMID:25231995^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.