Varicella-Zoster Virus Specifies a Thymidylate Synthetase Free

Abstract

SUMMARY

A homology search of proteins predicted from the recently reported complete DNA sequence of varicella-zoster virus (VZV) revealed that the product of gene 13 was highly homologous to eukaryotic and prokaryotic thymidylate synthetases (TSs). The VZV protein was shown to be a TS by three functional tests. Firstly, a plasmid designed to express the native protein was able to complement a strain of in which the natural TS gene is deleted. Secondly, in an enzyme assay for TS, extracts of the complemented strain were capable of releasing tritiated water from 2′-deoxy[5- H]uridylate. Thirdly, these extracts contained a protein that bound isotopically labelled 5-fluoro-2′-deoxyuridylate, a ligand specific for the active site of TS. In addition, a novel ligand-binding protein was detected in human cells infected with VZV.

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1987-05-01
2024-03-28
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