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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1990 Jun;87(11):4401–4405. doi: 10.1073/pnas.87.11.4401

Early transcription factor subunits are encoded by vaccinia virus late genes.

P D Gershon 1, B Moss 1
PMCID: PMC54118  PMID: 2190222

Abstract

The vaccinia virus early transcription factor (VETF) was shown to be a virus-encoded heterodimer. The gene for the 82-kDa subunit was identified as open reading frame (ORF) A8L, based on the N-terminal sequence of factor purified by using DNA-affinity magnetic beads. The 70-kDa subunit of VETF was refractory to N-terminal analysis, and so N-terminal sequences were obtained for three internal tryptic peptides. All three peptides matched sequences within ORF D6R. ORFs A8L and D6R are located within the central region of the vaccinia virus genome and are separated by about 13,600 base pairs. Proteins corresponding to the 3' ends of ORFs A8L and D6R were overexpressed in Escherichia coli and used to prepare antisera that bound to the larger and smaller subunits, respectively, of affinity-purified VETF. Immunoblot analysis of proteins from infected cells indicated that both subunits are expressed exclusively in the late phase of infection, just prior to their packaging in virus particles. The two subunits of VETF have no significant local or overall amino acid sequence homology to one another, to other entries in biological sequence data bases including bacterial sigma factors, or to recently determined sequences of some eukaryotic transcription factors. The 70-kDa subunit, however, has motifs in common with a super-family of established and putative DNA and RNA helicases.

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Selected References

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