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The pentatricopeptide repeat (PPR) protein family is a large family of RNA-binding proteins that is characterized by tandem arrays of a degenerate 35-amino-acid motif which form an α-solenoid structure. PPR proteins influence the editing, splicing, translation and stability of specific RNAs in mitochondria and chloroplasts ZEA MAYS: PPR10 is amongst the best studied PPR proteins, where sequence-specific binding to two RNA transcripts, ATPH: and PSAJ, HAS BEEN DEMONSTRATED TO FOLLOW: a recognition code where the identity of two amino acids per repeat determines the base-specificity. A recently solved ZmPPR10: PSAJ: complex crystal structure suggested a homodimeric complex with considerably fewer sequence-specific protein-RNA contacts than inferred PREVIOUSLY: Here we describe the solution structure of the ZmPPR10: ATPH: complex using size-exclusion chromatography-coupled synchrotron small-angle X-ray scattering (SEC-SY-SAXS). Our results support prior evidence that PPR10 binds RNA as a monomer, and that it does so in a manner that is commensurate with a canonical and predictable RNA-binding mode across much of the RNA-protein interface.

The solution structure of the pentatricopeptide repeat protein PPR10 upon binding atpH RNA