We earlier documented the involvement of novel Sp-family-like protein factors in transcription from the Autographa californica nucleopolyhedrovirus (AcNPV) polyhedrin (polh) gene promoter (Ramachandran et al. (2001) J. Biol. Chem. 276: 23440–23449). These zinc-dependent Sp-like factors bind to two putative Sp-factor-binding motifs, present within the AcSp sequence upstream of the polh promoter, with very high affinity (K d = 2.1 × 10 −12 M). Like other polh-promoter-associated host transcription factors, these Sp-like factors display tolerance to high ion concentrations up to even 3 M NaCl. An electrophoretic mobility shift assay demonstrated a probable cross-talk between the Spodoptera frugiperda ( Sf 9) Sp-family-like proteins and the TFIID complex. In complementary experiments, specific replacements of the Sp-factor-binding motifs with TATA-like elements resulted in expression of a luciferase reporter gene to almost the same level as that obtained with a wild-type native construct. Our results point to the possibility of the involvement of TFIID and Sf 9 Sp protein interaction in transcription from the baculovirus polyhedrin promoter.
Archives of Virology – Springer Journals
Published: Oct 1, 2007
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