Joint X-ray and NMR refinement of the yeast L30e-mRNA complex

Structure
Jeffrey A Chao, James R Williamson

Abstract

L30e, a Saccharomyces cervisiae ribosomal protein, regulates its own expression by binding to a purine-rich asymmetric internal loop located in both its pre-mRNA and mature mRNA. A crystal structure of an MBP-L30e fusion protein in complex with an RNA containing the pre-mRNA regulatory site was solved at 3.24 A. Interestingly, the structure of the RNA differed from that observed in a previously determined NMR structure of the complex. Analysis of the NMR data led to the identification of a single imino proton resonance in the internal loop that had been incorrectly assigned and was principally responsible for the erroneous RNA structure. A structure refinement was performed using both the X-ray diffraction data and the NMR-derived distance and angle restraints. The joint NMR and X-ray refinement resulted in improved stereochemistry and lower crystallographic R factors. The RNA internal loop of the MBP-L30e-mRNA complex adopts the canonical K-turn fold.

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