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Antimicrobial Agents and Chemotherapy, August 1998, p. 2128-2131, Vol. 42, No. 8
0066-4804/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
The M539V Polymerase Variant of Human Hepatitis B
Virus Demonstrates Resistance to 2'-Deoxy-3'-Thiacytidine and a
Reduced Ability to Synthesize Viral DNA
Stephanie K.
Ladner,
Thomas
J.
Miller, and
Robert W.
King*
Avid Therapeutics, Inc., Philadelphia,
Pennsylvania 19104
Received 13 August 1997/Returned for modification 3 November
1997/Accepted 21 May 1998
The cytosine analog 2'-deoxy-3'-thiacytidine (3TC) has been shown
to be an effective treatment for chronic hepatitis B virus (HBV)
infection. However, several liver transplant patients who were
undergoing treatment with 3TC for HBV infection experienced a
breakthrough of virus while on 3TC. The predominant virus found in
these patients' sera contained either a valine or isoleucine for the
methionine in the highly conserved YMDD nucleotide binding site in the
HBV polymerase. To determine the biological relevance of the Met-to-Val
substitution, we mutated a plasmid that contained a cDNA copy of the
HBV pregenomic RNA such that when virus replication occurred during
transient transfection of HepG2 cells, an M539V polymerase variant was
produced. We found that in transiently transfected cells, this variant
was approximately 330-fold less sensitive to the antiviral effects of
3TC and produced 7-fold less viral DNA than the wild type.
*
Corresponding author. Mailing address: The DuPont Merck
Pharmaceutical Co., The Experimental Station, P.O. Box 80336, Wilmington, DE 19880-0336. Phone: (302) 695-9354. Fax: (302) 695-3934. E-mail: robert.w.king{at}dupontmerck.com. [Requests for all
research reagents should be sent through Phil Furman, Triangle
Pharmaceuticals, 4 University Place, 4611 University Dr, Durham, NC
27707. Phone: (919) 493-5980.]
Antimicrobial Agents and Chemotherapy, August 1998, p. 2128-2131, Vol. 42, No. 8
0066-4804/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
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