Structure of the hepatitis C virus RNA helicase domain.Yao, N., Hesson, T., Cable, M., Hong, Z., Kwong, A.D., Le, H.V., Weber, P.C.
(1997) Nat.Struct.Mol.Biol. 4: 463-467
- PubMed: 9187654
- PubMed Abstract:
- Expression, Isolation, and Characterization of the Hepatitis C Virus ATPase/RNA Helicase
Jin, L.,Peterson, D.L.
(1995) Arch.Biochem.Biophys. 323: 47
- The Qrxgrxgrxxxg Motif of the Vaccinia Virus Dexh Box RNA Helicase Nph-II is Required for ATP Hydrolysis and RNA Unwinding But not for RNA Binding
Gross, C.H.,Shuman, S.
(1996) J.Virol. 70: 1706
Helicases are nucleotide triphosphate (NTP)-dependent enzymes responsible for unwinding duplex DNA and RNA during genomic replication. The 2.1 A resolution structure of the HCV helicase from the positive-stranded RNA hepatitis C virus reveals a molec ...
Helicases are nucleotide triphosphate (NTP)-dependent enzymes responsible for unwinding duplex DNA and RNA during genomic replication. The 2.1 A resolution structure of the HCV helicase from the positive-stranded RNA hepatitis C virus reveals a molecule with distinct NTPase and RNA binding domains. The structure supports a mechanism of helicase activity involving initial recognition of the requisite 3' single-stranded region on the nucleic acid substrate by a conserved arginine-rich sequence on the RNA binding domain. Comparison of crystallographically independent molecules shows that rotation of the RNA binding domain involves conformational changes within a conserved TATPP sequence and untwisting of an extended antiparallel beta-sheet. Location of the TATPP sequence at the end of an NTPase domain beta-strand structurally homologous to the 'switch region' of many NTP-dependent enzymes offers the possibility that domain rotation is coupled to NTP hydrolysis in the helicase catalytic cycle.
Structural Chemistry and Virology Department, Schering-Plough Research Institute, Kensworth, New Jersey 07033, USA.