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Crystal structure of the beta-finger domain of yeast Prp8Crystal structure of the beta-finger domain of yeast Prp8
Structural highlights
Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedPrp8 stands out among hundreds of splicing factors as a key regulator of spliceosome activation and a potential cofactor of the splicing reaction. We present here the crystal structure of a 274-residue domain (residues 1,822-2,095) near the C terminus of Saccharomyces cerevisiae Prp8. The most striking feature of this domain is a beta-hairpin finger protruding out of the protein (hence, this domain will be referred to as the beta-finger domain), resembling many globular ribosomal proteins with protruding extensions. Mutations throughout the beta-finger change the conformational equilibrium between the first and the second catalytic step. Mutations at the base of the beta-finger affect U4/U6 unwinding-mediated spliceosome activation. Prp8 may insert its beta-finger into the first-step complex (U2/U5/U6/pre-mRNA) or U4/U6.U5 tri-snRNP and stabilize these complexes. Mutations on the beta-finger likely alter these interactions, leading to the observed mutant phenotypes. Our results suggest a possible mechanism of how Prp8 regulates spliceosome activation. These results also demonstrate an analogy between a spliceosomal protein and ribosomal proteins that insert extensions into folded rRNAs and stabilize the ribosome. Crystal structure of the beta-finger domain of Prp8 reveals analogy to ribosomal proteins.,Yang K, Zhang L, Xu T, Heroux A, Zhao R Proc Natl Acad Sci U S A. 2008 Sep 16;105(37):13817-22. Epub 2008 Sep 8. PMID:18779563[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences |
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