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Mayer, D; Molawi, K; Martínez-Sobrido, L; Ghanem, A; Thomas, S; Baginsky, S; Grossmann, J; García-Sastre, A; Schwemmle, M (2007). Identification of cellular interaction partners of the influenza virus ribonucleoprotein complex and polymerase complex using proteomic-based approaches. Journal of Proteome Research, 6(2):672-682.

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Cellular factors that associate with the influenza A viral ribonucleoprotein (vRNP) are presumed to play important roles in the viral life cycle. To date, interaction screens using individual vRNP components, such as the nucleoprotein or viral polymerase subunits, have revealed few cellular interaction partners. To improve this situation, we performed comprehensive, proteomics-based screens to identify cellular factors associated with the native vRNP and viral polymerase complexes. Reconstituted vRNPs were purified from human cells using Strep-tagged viral nucleoprotein (NP-Strep) as bait, and co-purified cellular factors were identified by mass spectrometry (MS). In parallel, reconstituted native influenza A polymerase complexes were isolated using tandem affinity purification (TAP)-tagged polymerase subunits as bait, and co-purified cellular factors were again identified by MS. Using these techniques, we identified 41 proteins that co-purified with NP-Strep-enriched vRNPs and four cellular proteins that co-purified with the viral polymerase complex. Two of the polymerase-associated factors, importin-beta3 and PARP-1, represent novel interaction partners. Most cellular proteins previously shown to interact with either viral NP and/or vRNP were also identified using our method, demonstrating its sensitivity. Co-immunoprecipitation studies in virus-infected cells using selected novel interaction partners, including nucleophosmin (NPM), confirmed their association with vRNP. Immunofluorescence analysis further revealed that NPM is recruited to sites of viral transcription and replication in infected cells. Additionally, overexpression of NPM resulted in increased viral polymerase activity, indicating its role in viral RNA synthesis. In summary, the proteomics-based approaches used in this study represent powerful tools to identify novel vRNP-associated cellular factors for further characterization.


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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > Functional Genomics Center Zurich
08 University Research Priority Programs > Systems Biology / Functional Genomics
Dewey Decimal Classification:570 Life sciences; biology
610 Medicine & health
Date:February 2007
Deposited On:18 Dec 2009 13:03
Last Modified:05 Apr 2016 13:35
Publisher:American Chemical Society
Free access at:Related URL. An embargo period may apply.
Publisher DOI:10.1021/pr060432u
Related URLs:http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2577182/ (Organisation)
PubMed ID:17269724

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