One nucleotide in a kappaB site can determine cofactor specificity for NF-kappaB dimers.
The transcription factor NF-kappaB regulates a wide variety of genes involved in multiple processes. Although the apparent consensus sequence of DNA binding sites for NF-kappaB (kappaB sites) is very broad, the sites active in any one gene show remarkable evolutionary stability. Using a lentivirus-based methodology for implantation of gene regulatory sequences we show that for genes with two kappaB sites, both are required for activity. Swapping sites between kappaB-dependent genes altered NF-kappaB dimer specificity of the promoters and revealed that two kappaB sites can function together as a module to regulate gene activation. Further, although the sequence of the kappaB site is important for determining kappaB family member specificity, rather than determining the ability of a particular dimer to bind effectively, the sequence affects which coactivators will form productive interactions with the bound NF-kappaB dimer. This suggests that binding sites may impart a specific configuration to bound transcription factors.
Leung
Thomas H
TH
Division of Biology, California Institute of Technology, Pasadena, CA 91125, USA.
Hoffmann
Alexander
A
Baltimore
David
D
D000818:Animals; D000081242:B-Cell Lymphoma 3 Protein; D001483:Base Sequence; D001665:Binding Sites; D054357:Chemokine CXCL10; D019743:Chemokines, CXC / Q000378:metabolism; D002843:Chromatin / Q000378:metabolism; D017124:Conserved Sequence; D004247:DNA / Q000378:metabolism; D019281:Dimerization; D005347:Fibroblasts / Q000378:metabolism; D017930:Genes, Reporter; D006801:Humans; D016086:Lentivirus / Q000235:genetics; D051379:Mice; D008954:Models, Biological; D008969:Molecular Sequence Data; D016328:NF-kappa B / Q000737:chemistry* / Q000235:genetics*; D010957:Plasmids / Q000378:metabolism; D011233:Precipitin Tests; D011401:Promoter Regions, Genetic; D011485:Protein Binding; D011518:Proto-Oncogene Proteins / Q000378:metabolism; D034741:RNA, Small Interfering / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013997:Time Factors; D014157:Transcription Factors; D019076:Transgenes
D000081242:B-Cell Lymphoma 3 Protein; C000631344:BCL3 protein, human; C000631345:Bcl3 protein, mouse; D054357:Chemokine CXCL10; D019743:Chemokines, CXC; D002843:Chromatin; D016328:NF-kappa B; D011518:Proto-Oncogene Proteins; D034741:RNA, Small Interfering; D014157:Transcription Factors; D004247:DNA