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A functional NF-kappaB binding site in the human papillomavirus type 16 long control region.

par Fontaine, Véronique ;van der Meijden, E;de Graaf, J;ter Schegget, J;Struyk, L
Référence Virology, 272, 1, page (40-49)
Publication Publié, 2000-06

Article révisé par les pairs

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Résumé :

By computer search, we identified one potential NF-kappaB binding site in the HPV16 long control region (LCR) at position 7554-7563 having two mismatches in comparison to the consensus NF-kappaB binding site of the Igkappa L promoter. Bandshift experiments with nuclear extracts from HeLa cells or purified glutathione S-transferase-p65 fusion protein clearly demonstrated that NF-kappaB is able to bind to this region of the LCR. However, in comparison to NF-kappaB binding on a consensus probe, the affinity of NF-kappaB for this site is about 250-fold reduced. When mutations were introduced into this NF-kappaB binding site, the activity of the LCR was increased, strongly suggesting that NF-kappaB was acting as a transcriptional repressor in the context of the HPV16 LCR. In addition, overexpression of NF-kappaB p65 repressed the activity of the HPV16 LCR, strengthening this conclusion.