Step‐by‐step progress toward understanding the hepatitis C virus RNA helicase†
Key result
ATP coordinates HCV NS3 helicase movement in ~11 base pair steps with rapid unwinding substeps.
Why the study?
Limited resolution had left inaccessible the detailed mechanisms by which helicases couple nucleic acid structural rearrangement to ATP binding and hydrolysis.
Population
Hepatitis C virus helicase (NS3) monomer
Design
Real-time single-molecule assay
Authors
Discussion
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Member takes
Implication
Potential HCV antiviral target; extends non-hexameric helicase mechanism but leaves open in vivo validation.
Structured PICO
P
Population
Hepatitis C virus RNA helicase (NS3) monomer
E
Exposure
Real-time observation of RNA translocation and unwinding cycles at a resolution of two base pairs and 20 ms
O
Outcome
Mechanism of cyclic movement and unwinding coordinated by ATP
The study reveals the inchworm-like ATP-coupled mechanism of the hepatitis C virus NS3 helicase, providing insights into non-hexameric helicase function and a potential drug target.
Cite This Study
Frick et al. (2006) studied Hepatitis C virus. ATP was evaluated on RNA translocation and unwinding cycles of NS3 monomer. The cyclic movement of the hepatitis C virus NS3 helicase is coordinated by ATP in discrete steps of 11 +/- 3 base pairs, with actual unwinding occurring in rapid smaller substeps of 3.6 +/- 1.3 base pairs.