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Journal of Virology, February 1999, p. 1165-1174, Vol. 73, No. 2
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

A Phylogenetically Conserved Stem-Loop Structure at the 5' Border of the Internal Ribosome Entry Site of Hepatitis C Virus Is Required for Cap-Independent Viral Translation

Masao Honda,1 Michael R. Beard,2 Li-Hua Ping,3 and Stanley M. Lemon2,*

First Department of Internal Medicine, Kanazawa University, Kanazawa, Japan1; Department of Microbiology and Immunology, The University of Texas Medical Branch at Galveston, Galveston, Texas 77555-10192; and Department of Medicine, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-70303

Received 9 July 1998/Accepted 1 November 1998

Hepatitis C virus (HCV) initiates translation of its polyprotein under the control of an internal ribosome entry site (IRES) that comprises most of the 341-nucleotide (nt) 5' nontranslated RNA (5'NTR). A comparative analysis of related flaviviral sequences suggested that an RNA segment for which secondary structure was previously ill defined (domain II, nt 44 to 118) forms a conserved stem-loop that is located at the 5' border of the HCV IRES and thus may function in viral translation. This prediction was tested by a mutational analysis of putative helical structures that examined the impact of both covariant and noncovariant nucleotide substitutions on IRES activity in vivo and in vitro. Results of these experiments provide support for predicted base pair interactions between nt 44 to 52 and 111 to 118 and between nt 65 to 70 and 97 to 102 of the HCV 5'NTR. Substitutions at either nt 45 and 46 or nt 116 and 117 resulted in reciprocal changes in V1 nuclease cleavage patterns within the opposing strand of the putative helix, consistent with the predicted base pair interactions. IRES activity was highly dependent on maintenance of the stem-loop II structure but relatively tolerant of covariant nucleotide substitutions within predicted helical segments. Sequence alignments suggested that the deduced domain II structure is conserved within the IRESs of pestiviruses as well as the novel flavivirus GB virus B. Despite marked differences in primary nucleotide sequence within conserved helical segments, the sequences of the intervening single-stranded loop segments are highly conserved in these different viruses. This suggests that these segments of the viral RNA may interact with elements of the host translational machinery that are broadly conserved among different mammalian species.

* Corresponding author. Mailing address: Department of Microbiology and Immunology, The University of Texas Medical Branch at Galveston, 4.104 Medical Research Building, 301 University Blvd., Galveston, TX 77555-1019. Phone: (409) 772-2324. Fax: (409) 772-3757. E-mail: smlemon{at}utmb.edu.

Journal of Virology, February 1999, p. 1165-1174, Vol. 73, No. 2
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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