Abstract

This paper presents the entire nucleotide sequence of the thymidine Kinase (TK) gene of canine herpesvirus (CHV). The gene was located within a 2.1 kbp EcoRV fragment by Southern-blot hybridization with a probe derived from the known feline herpesvirus type 1 (FHV-1) TK gene. An open reading frame (ORF) of 987 nucleotides, capable of encoding a TK translation product of 328 amino acids, was identified. Alignment of the predicted amino acid sequence of the CHV TK with other herpesvirus TKs revealed homologies of 25-47%. The proposed nucleotide-binding site and thymidine-binding site sequences of known herpesvirus TKs could be aligned with similar sequences in CHV TK. Northern-blot analysis revealed 1.3 kb and 5.0 kb mRNAs as the TK-specific transcripts. It is probable that the 1.3 kb transcript codes for the CHV TK and that the 5.0 kb transcript codes for the CHV TK and the downstream sequence.

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