RNA Recognition and Cleavage by an Splicing Endonuclease
Xue, S., Calvin, K., Li, H.(2006) Science 312: 902-910
- PubMed: 16690865
- DOI: https://doi.org/10.1126/science.1126629
- Primary Citation of Related Structures:
2GJW - PubMed Abstract:
The RNA splicing endonuclease cleaves two phosphodiester bonds within folded precursor RNAs during intron removal, producing the functional RNAs required for protein synthesis. Here we describe at a resolution of 2.85 angstroms the structure of a splicing endonuclease from Archaeglobus fulgidus bound with a bulge-helix-bulge RNA containing a noncleaved and a cleaved splice site. The endonuclease dimer cooperatively recognized a flipped-out bulge base and stabilizes sharply bent bulge backbones that are poised for an in-line RNA cleavage reaction. Cooperativity arises because an arginine pair from one catalytic domain sandwiches a nucleobase within the bulge cleaved by the other catalytic domain.
Organizational Affiliation:
Department of Chemistry and Biochemistry, Institute of Molecular Biophysics, Florida State University, Tallahassee, FL 32306, USA.