Download MendeleyCrystal structure of a phage Twort group I ribozyme-product complex
Golden, B.L., Kim, H., Chase, E.(2005) Nat Struct Mol Biol 12: 82-89
- PubMed: 15580277
- DOI: https://doi.org/10.1038/nsmb868
- Primary Citation of Related Structures:
1Y0Q - PubMed Abstract:
Group I introns are catalytic RNAs capable of orchestrating two sequential phosphotransesterification reactions that result in self-splicing. To understand how the group I intron active site facilitates catalysis, we have solved the structure of an active ribozyme derived from the orf142-I2 intron from phage Twort bound to a four-nucleotide product RNA at a resolution of 3.6 A. In addition to the three conserved domains characteristic of all group I introns, the Twort ribozyme has peripheral insertions characteristic of phage introns. These elements form a ring that completely envelops the active site, where a snug pocket for guanosine is formed by a series of stacked base triples. The structure of the active site reveals three potential binding sites for catalytic metals, and invokes a role for the 2' hydroxyl of the guanosine substrate in organization of the active site for catalysis.
Organizational Affiliation:
Department of Biochemistry, Purdue University, 175 South University Street, West Lafayette, Indiana 47907, USA. barbgolden@purdue.edu
