Nucleic Acids Research, 2000, Vol. 28, No. 6 1313-1321
© 2000 Oxford University Press
Interaction of the yeast DExH-box RNA helicase Prp22p with the 3' splice site during the second step of nuclear pre-mRNA splicing
Department of Biochemistry and the Center for RNA Molecular Biology, Case Western Reserve University, School of Medicine, Cleveland, OH 44106, USA and 1Department of Microbiology and Immunology, Weill Medical College of Cornell University, 1300 York Avenue, New York, NY 10021, USA
Using site-specific incorporation of the photochemical cross-linking reagent 4-thiouridine, we demonstrate the previously unknown association of two proteins with yeast 3' splice sites. One of these is an unidentified ~122 kDa protein that cross-links to 3' splice sites during formation of the pre-spliceosome. The other factor is the DExH-box RNA helicase, Prp22p. With substrates functional in the second step of splicing, only very weak cross-linking of Prp22p to intron sequences at the 3' splice site is observed. In contrast, substrates blocked at the second step exhibit strong cross-linking of Prp22 to intron sequences at the 3' splice site, but not to adjacent exon sequences. In vitro reconstitution experiments also show that the association of Prp22p with intron sequences at the 3' splice site is dependent on Prp16p and does not persist when release of mature mRNA from the spliceosome is blocked. Taken together, these results suggest that the 3' splice site of yeast introns is contacted much earlier than previously envisioned by a protein of ~120 kDa, and that a transient association of Prp22p with the 3' splice site occurs between the first and second catalytic steps.
* To whom correspondence should be addressed. Tel: +1 216 368 8816; Fax: +1 216 368 3419; Email: dsm10@po.cwru.edu
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