The solution structure of the pentatricopeptide repeat protein PPR10 upon binding atpH RNA.
The solution structure of the pentatricopeptide repeat protein PPR10 upon binding atpH RNA.
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DOI:
10.1093/nar/gkv027
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发表时间:
2015-02-18
影响因子:
14.9
通讯作者:
Bond CS
中科院分区:
文献类型:
--
作者:
Gully BS;Cowieson N;Stanley WA;Shearston K;Small ID;Barkan A;Bond CS
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.
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