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We prepared antiserum that reacted with a major core polypeptide of approximately 62,000 daltons (62K polypeptide), designated 4b, and its 74K precursor, designated P4b. A cell-free translation product of vaccinia virus late mRNA that comigrated with P4b was specifically immunoprecipitated. The late mRNA encoding P4b hybridized to restriction fragments derived from the left end of the HindIII A fragment and to a lesser extent from the right side of the HindIII D fragment. A polypeptide that comigrated with P4a, the precursor of another major core polypeptide, was synthesized by mRNA that hybridized to DNA segments upstream of the P4b gene. Complete nucleotide sequence analysis of the P4b gene revealed an open reading frame, entirely within the HindIII A fragment, that was sufficient to encode a 644-amino-acid polypeptide of 73K. The 5' end of the P4b mRNA was located at or just above the translational initiation site.

journal of virology

Transcriptional and translational mapping and nucleotide sequence analysis of a vaccinia virus gene encoding the precursor of the major core polypeptide 4b