title: Novobiocin inhibits the SV40 enhancer activity.
abstract: Using a transient expression assay, we have analysed the effect of novobiocin, DNA topoisomerase II inhibitor, on simian virus 40(SV40) enhancer activities. We used the recombinant clones containing type I or II collagen promoters placed upstream of the bacterial chloramphenicol acetyltransferase (CAT) gene with or without SV40 enhancer. We observed the expected increase in CAT activities due to the presence of the SV40 enhancer. Interestingly, CAT gene expression of the enhancer-containing constructs were inhibited more sensitively by novobiocin than that of the enhancer-less construct. This findings lead us propose that DNA superhelicity mediated by topoisomeraseII is one of the important factor for the manifestation of SV40 enhancer activity.
authors.affiliation: Laboratory of Developmental Biology and Anomalies, National Institute of Dental Research, Bethesda, Maryland 20892.
authors.forename: K
authors.initials: K
authors.lastname: Kohno
authors.forename: Y
authors.initials: Y
authors.lastname: Iwamoto
authors.forename: G R
authors.initials: GR
authors.lastname: Martin
authors.forename: Y
authors.initials: Y
authors.lastname: Yamada
mesh_terms: D000123:Acetyltransferases / Q000235:genetics; D000818:Animals; D002478:Cells, Cultured; D015500:Chloramphenicol O-Acetyltransferase; D003001:Cloning, Molecular; D004742:Enhancer Elements, Genetic / Q000187:drug effects*; D005796:Genes / Q000187:drug effects; D005814:Genes, Viral / Q000187:drug effects*; D051379:Mice; D009675:Novobiocin / Q000494:pharmacology*; D010957:Plasmids; D013539:Simian virus 40 / Q000187:drug effects / Q000235:genetics*; D059005:Topoisomerase II Inhibitors; D014162:Transfection
chemical_list: D059005:Topoisomerase II Inhibitors; D009675:Novobiocin; D000123:Acetyltransferases; D015500:Chloramphenicol O-Acetyltransferase