Please use this identifier to cite or link to this item:
Title: A subset of human 35S U5 proteins, including Prp19, function prior to catalytic step 1 of splicing.
Authors: Makarova, OV
Makarov, EM
Urlaub, H
Will, CL
Gentzel, M
Wilm, M
Lührmann, R
First Published: 16-Jun-2004
Citation: EMBO J, 2004, 23 (12), pp. 2381-2391
Abstract: During catalytic activation of the spliceosome, snRNP remodeling events occur, leading to the formation of a 35S U5 snRNP that contains a large group of proteins, including Prp19 and CDC5, not found in 20S U5 snRNPs. To investigate the function of 35S U5 proteins, we immunoaffinity purified human spliceosomes that had not yet undergone catalytic activation (designated BDeltaU1), which contained U2, U4, U5, and U6, but lacked U1 snRNA. Comparison of the protein compositions of BDeltaU1 and activated B* spliceosomes revealed that, whereas U4/U6 snRNP proteins are stably associated with BDeltaU1 spliceosomes, 35S U5-associated proteins (which are present in B*) are largely absent, suggesting that they are dispensable for complex B formation. Indeed, immunodepletion/complementation experiments demonstrated that a subset of 35S U5 proteins including Prp19, which form a stable heteromeric complex, are required prior to catalytic step 1 of splicing, but not for stable integration of U4/U6.U5 tri-snRNPs. Thus, comparison of the proteomes of spliceosomal complexes at defined stages can provide information as to which proteins function as a group at a particular step of splicing.
DOI Link: 10.1038/sj.emboj.7600241
ISSN: 0261-4189
Type: Journal Article
Appears in Collections:Published Articles, Dept. of Biochemistry

Files in This Item:
There are no files associated with this item.

Items in LRA are protected by copyright, with all rights reserved, unless otherwise indicated.