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Journal of General Virology header logo Journal of General Virology

Volume 75, Issue 7

Analysis of the thymidine kinase of a herpes simplex virus type 1 isolate that exhibits resistance to (E)-5-(2-bromovinyl)-2′-deoxyuridine No Access

Abstract

The mechanism responsible for the decreased sensitivity of a clinical herpes simplex virus type 1 (HSV-1) isolate, HSV-145, to (E)-5-(2-bromovinyl)-2′-deoxyuridine (BVDU) was examined. Measurements of 50% inhibitory doses of several drugs demonstrated that although HSV-145 was sensitive to phosphonoacetic acid, adenine arabinoside and acyclovir, its sensitivity to BVDU and 5-(2-chloroethyl)-2′-deoxyuridine was significantly less than that normally observed for HSV-1. Analysis of the thymidylate kinase (TMP-K) activity of HSV-145 thymidine kinase (TK) demonstrated a decreased level of TMP-K activity when compared to HSV-1 TK. The TMP-K activity of HSV-145 resembled that observed for HSV-2 and the TK-deficient strain HSV-1 TK. When the nucleotide sequence of the HSV-145 TK gene was compared to that of the HSV-1 strains Cl(101) and SC16 a single nucleotide substitution (G changed to A at base position 502) was detected which would result in the substitution of threonine at amino acid position 168 for alanine. The substitution is the same as that for the laboratory- derived BVDU-resistant virus HSV-1 SC16B3. Collectively, these studies highlight the importance of amino acid conservation at position 168 of the HSV-1 TK in conferring efficient TMP-K activity and BVDU sensitivity.

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© The Journal of General Virology 1994
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1994-07-01
2025-04-28
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/content/journal/jgv/10.1099/0022-1317-75-7-1743
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Analysis of the thymidine kinase of a herpes simplex virus type 1 isolate that exhibits resistance to (E)-5-(2-bromovinyl)-2′-deoxyuridine
J. Gen. Virol. 75, 1743 (1994); https://doi.org/10.1099/0022-1317-75-7-1743
/content/journal/jgv/10.1099/0022-1317-75-7-1743
/content/journal/jgv/10.1099/0022-1317-75-7-1743
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