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Journal of Virology, March 2003, p. 3557-3568, Vol. 77, No. 6
0022-538X/03/$08.00+0     DOI: 10.1128/JVI.77.6.3557-3568.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

3' Nontranslated RNA Signals Required for Replication of Hepatitis C Virus RNA

MinKyung Yi and Stanley M. Lemon*

Department of Microbiology and Immunology, The University of Texas Medical Branch at Galveston, Galveston, Texas 77555-1019

Received 10 September 2002/ Accepted 20 December 2002

We describe a mutational analysis of the 3' nontranslated RNA (3'NTR) signals required for replication of subgenomic hepatitis C virus (HCV) RNAs. A series of deletion mutants was constructed within the background of an HCV-N replicon that induces the expression of secreted alkaline phosphatase in order to examine the requirements for each of the three domains comprising the 3'NTR, namely, the highly conserved 3' terminal 98-nucleotide (nt) segment (3'X), an upstream poly(U)-poly(UC) [poly(U/UC)] tract, and the variable region (VR) located at the 5' end of the 3'NTR. Each of these domains was found to contribute to efficient replication of the viral RNA in transiently transfected hepatoma cells. Replication was not detected when any of the three putative stem-loop structures within the 3'X region were deleted. Similarly, complete deletion of the poly(U/UC) tract abolished replication. Replacement of a minimum of 50 to 62 nt of poly(U/UC) sequence was required for detectable RNA replication when the native sequence was restored in a stepwise fashion from its 3' end. Lengthier poly(U/UC) sequences, and possibly pure homopolymeric poly(U) tracts, were associated with more efficient RNA amplification. Finally, while multiple deletion mutations were tolerated within VR, each led to a partial loss of replication capacity. The impaired replication capacity of the deletion mutants could not be explained by reduced translational activity or by decreased stability of the RNA, suggesting that each of these mutations may impair recognition of the RNA by the viral replicase during an early step in negative-strand RNA synthesis. The results indicate that the 3'-most 150 nt of the HCV-N genome [the 3'X region and the 3' 52 nt of the poly(U/UC) tract] contain RNA signals that are essential for replication, while the remainder of the 3'NTR plays a facilitating role in replication but is not absolutely required.

* Corresponding author. Mailing address: Department of Microbiology and Immunology, The University of Texas Medical Branch at Galveston, 301 University Blvd., Galveston, TX 77555-1019. Phone: (409) 772-4793. Fax: (409) 772-9598. E-mail: smlemon{at}utmb.edu.

Journal of Virology, March 2003, p. 3557-3568, Vol. 77, No. 6
0022-538X/03/$08.00+0     DOI: 10.1128/JVI.77.6.3557-3568.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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