Keil, P.* ; Wulf, A.* ; Kachariya, N. ; Reuscher, S.* ; Huhn, K.* ; Silbern, I.* ; Altmüller, J.* ; Keller, M.* ; Stehle, R. ; Zarnack, K.* ; Sattler, M. ; Urlaub, H.* ; Sträßer, K.*
     
    
        
Npl3 functions in mRNP assembly by recruitment of mRNP components to the transcription site and their transfer onto the mRNA.
    
    
        
    
    
        
        Nucleic Acids Res. 51, 831-851 (2023)
    
    
    
      
      
	
	    RNA-binding proteins (RBPs) control every RNA metabolic process by multiple protein-RNA and protein-protein interactions. Their roles have largely been analyzed by crude mutations, which abrogate multiple functions at once and likely impact the structural integrity of the large ribonucleoprotein particles (RNPs) these proteins function in. Using UV-induced RNA-protein crosslinking of entire cells, protein complex purification and mass spectrometric analysis, we identified >100 in vivo RNA crosslinks in 16 nuclear mRNP components in Saccharomyces cerevisiae. For functional analysis, we chose Npl3, which displayed crosslinks in its two RNA recognition motifs (RRMs) and in the connecting flexible linker region. Both RRM domains and the linker uniquely contribute to RNA recognition as revealed by NMR and structural analyses. Interestingly, mutations in these regions cause different phenotypes, indicating distinct functions of the different RNA-binding domains. Notably, an npl3-Linker mutation strongly impairs recruitment of several mRNP components to chromatin and incorporation of other mRNP components into nuclear mRNPs, establishing a so far unknown function of Npl3 in nuclear mRNP assembly. Taken together, our integrative analysis uncovers a specific function of the RNA-binding activity of the nuclear mRNP component Npl3. This approach can be readily applied to RBPs in any RNA metabolic process.
	
	
	    
	
       
      
	
	    
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        Publication type
        Article: Journal article
    
 
    
        Document type
        Scientific Article
    
 
    
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        Keywords
        Heteronuclear Nmr-spectroscopy; Small-angle Scattering; Photo-cross-linking; Mass-spectrometry; Gene-expression; Splicing Regulation; Protein Structures; Backbone Dynamics; Binding Protein; Sr Proteins
    
 
    
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        Language
        english
    
 
    
        Publication Year
        2023
    
 
    
        Prepublished in Year
        2022
    
 
    
        HGF-reported in Year
        2022
    
 
    
    
        ISSN (print) / ISBN
        0305-1048
    
 
    
        e-ISSN
        1362-4962
    
 
    
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	    Volume: 51,  
	    Issue: 2,  
	    Pages: 831-851 
	    Article Number: ,  
	    Supplement: ,  
	
    
 
    
        
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            Publisher
            Oxford University Press
        
 
        
            Publishing Place
            Great Clarendon St, Oxford Ox2 6dp, England
        
 
	
        
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        Reviewing status
        Peer reviewed
    
 
     
    
        POF-Topic(s)
        30203 - Molecular Targets and Therapies
    
 
    
        Research field(s)
        Enabling and Novel Technologies
    
 
    
        PSP Element(s)
        G-503000-001
    
 
    
        Grants
        EU
DFG
    
 
    
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        Erfassungsdatum
        2023-01-09