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. 1982 Aug;43(2):403–409. doi: 10.1128/jvi.43.2.403-409.1982

Mapping and identification of the vaccinia virus thymidine kinase gene.

D E Hruby, L A Ball
PMCID: PMC256142  PMID: 6287024

Abstract

The thymidine kinase gene of vaccinia virus (VV) was mapped on the viral genome by using cloned fragments of the viral DNA to hybridize to early viral mRNA. Individual DNA fragments that represented about half of the viral genome were assayed, both for their ability to arrest the cell-free synthesis of active VV thymidine kinase and for their ability to select functional mRNA for the viral enzyme. Both activities were located in HindIII fragment J, which maps near the middle of VV DNA and contains about 2.6% of the genome (4,800 base pairs). This DNA fragment encodes four known early polypeptides, and to determine which of these was thymidine kinase, early VV mRNA was fractionated by sucrose gradient centrifugation and used to direct cell-free synthesis of the active enzyme. The thymidine kinase mRNA cosedimented with several species that encoded polypeptides in the molecular weight range 15,000 to 25,000. Hybridization of these mRNAs to HindIII-J DNA selected a message that directed the synthesis of thymidine kinase and a single polypeptide with an apparent molecular weight of 19,000. The native molecular weight of VV thymidine kinase is about 80,000, so these data indicate that, unlike thymidine kinase from several other sources, the active VV enzyme is probably a tetramer of 19,000-molecular-weight subunits.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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