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  Insights into the activation of the helicase Prp43 by biochemical studies and structural mass spectrometry.

Christian, H., Hofele, R. V., Urlaub, H., & Ficner, R. (2013). Insights into the activation of the helicase Prp43 by biochemical studies and structural mass spectrometry. Nucleic Acids Research, 42(2), 1162-1179. doi:10.1093/nar/gkt985.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0018-0100-D Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-CE96-4
Genre: Journal Article

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Christian, H., Author
Hofele, R. V.1, Author              
Urlaub, H.1, Author              
Ficner, R., Author
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1Research Group of Bioanalytical Mass Spectrometry, MPI for biophysical chemistry, Max Planck Society, ou_578613              

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 Abstract: Splicing of precursor messenger RNA is a hallmark of eukaryotic cells, which is carried out by the spliceosome, a multi-megadalton ribonucleoprotein machinery. The splicing reaction removes non-coding regions (introns) and ligates coding regions (exons). The spliceosome is a highly dynamic ribonucleoprotein complex that undergoes dramatic structural changes during its assembly, the catalysis and its disassembly. The transitions between the different steps during the splicing cycle are promoted by eight conserved DExD/H box ATPases. The DEAH-box protein Prp43 is responsible for the disassembly of the intron-lariat spliceosome and its helicase activity is activated by the G-patch protein Ntr1. Here, we investigate the activation of Prp43 by Ntr1 in the presence and absence of RNA substrate by functional assays and structural proteomics. Residues 51-110 of Ntr1 were identified to be the minimal fragment that induces full activation. We found protein-protein cross-links that indicate that Prp43 interacts with the G-patch motif of Ntr1 through its C-terminal domains. Additionally, we report on functionally important RNA binding residues in both proteins and propose a model for the activation of the helicase.

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Language(s): eng - English
 Dates: 2013-10-27
 Publication Status: Published online
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 Rev. Method: Peer
 Identifiers: DOI: 10.1093/nar/gkt985
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Title: Nucleic Acids Research
Source Genre: Journal
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Pages: - Volume / Issue: 42 (2) Sequence Number: - Start / End Page: 1162 - 1179 Identifier: ISSN: 0305-1048