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Animal: RNA Viruses |
Departments of Haematology1 and Medicine2, University of Cambridge, School of Clinical Medicine, Cambridge, UK
Author for correspondence: Juraj Petrik. Present address: Edinburgh and South East Scotland Blood Transfusion Service, Royal Infirmary, Lauriston Place, Edinburgh EH3 9HB, UK.Fax +44 131 5365352.
The unique poly(U/UC) tract, the middle part of the tripartite 3' non-coding region (3'NCR) of hepatitis C virus (HCV) genomic RNA, may represent a recognition signal for the HCV replicase complex. In this study, several proteins binding specifically to immobilized ribooligonucleotide r(U)25 mimicking this structure were identified using cytosolic extracts from HCV-negative or -positive liver explants, and a prominent 36 kDa protein was studied further. Competition experiments including homoribopolymers revealed binding affinities in the order: oligo/poly(U)>>(A)>>(C)>>(G). The protein was identified as glyceraldehyde-3-phosphate dehydrogenase (GAPDH), a multifunctional protein known to bind RNA. GAPDH bound efficiently to the full-length HCV RNA and binding to various 3'NCR constructs revealed critical dependence upon the presence of the middle part of the 3'NCR. Polypyrimidine tract-binding protein, described previously to bind the 3'NCR, did not bind efficiently to the middle part of 3'NCR and was captured from liver extracts in considerably smaller quantities.
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