Sie befinden Sich nicht im Netzwerk der Universität Paderborn. Der Zugriff auf elektronische Ressourcen ist gegebenenfalls nur via VPN oder Shibboleth (DFN-AAI) möglich. mehr Informationen...
Transcription Factor FoxA (HNF3) on a Nucleosome at an Enhancer Complex in Liver Chromatin
Ist Teil von
The Journal of biological chemistry, 2001-11, Vol.276 (48), p.44385-44389
Ort / Verlag
United States: American Society for Biochemistry and Molecular Biology
Erscheinungsjahr
2001
Quelle
MEDLINE
Beschreibungen/Notizen
Nucleosome-like particles and acetylated histones occur near active promoters and enhancers, and certain transcription factors
can recognize their target sites on the surface of a nucleosome in vitro ; yet it has been unclear whether transcription factors can occupy target sites on nucleosomes in native chromatin. We developed
a method for sequential chromatin immunoprecipitation of distinct nuclear proteins that are simultaneously cross-linked to
nucleosome-sized genomic DNA segments. We find that core histone H2A co-occupies, along with the FoxA (hepatocyte nuclear
factor-3) transcription factor, DNA for the albumin transcriptional enhancer in native liver chromatin, where the enhancer
is active. Because histone H2A on nuclear DNA is only known to exist in nucleosomes, we conclude that transcription factors
can form a stable complex on nucleosomes at an active enhancer element in vivo .