title: Transcription regulation from a TATA and INR-less promoter: spatial segregation of promoter function.
abstract: The mode of regulation of class II genes that lack the known core promoter elements is presently unclear. Here, we studied one such example, the murine CD80 gene. An unusual mechanism was revealed wherein the pre-initiation complex (PIC) first assembled on an upstream, NF-kappaB enhancer element. Notably, this assembly occurred independent of contributions from the core promoter domain, and resulted in a PIC that was competent for transcription initiation. Positioning was subsequently achieved by exploiting the intrinsic architecture of the promoter, by virtue of which the tethered PIC was spatially juxtaposed with the transcription initiation site. Bridging interactions then ensued, through protein-protein contacts, which then enabled the elongation phase of CD80 transcription.
authors.affiliation: Immunology Group, International Centre for Genetic Engineering and Biotechnology, Aruna Asaf Ali Marg, New Delhi, India.
authors.forename: Anuja A
authors.initials: AA
authors.lastname: George
authors.forename: Manish
authors.initials: M
authors.lastname: Sharma
authors.forename: Badri N
authors.initials: BN
authors.lastname: Singh
authors.forename: Naresh C
authors.initials: NC
authors.lastname: Sahoo
authors.forename: Kanury Vs
authors.initials: KV
authors.lastname: Rao
mesh_terms: D000818:Animals; D018122:B7-1 Antigen / Q000096:biosynthesis* / Q000235:genetics; D002460:Cell Line; D004742:Enhancer Elements, Genetic / Q000502:physiology*; D005786:Gene Expression Regulation / Q000502:physiology*; D051379:Mice; D016328:NF-kappa B / Q000378:metabolism*; D016385:TATA Box / Q000502:physiology*; D014158:Transcription, Genetic / Q000502:physiology*
chemical_list: D018122:B7-1 Antigen; D016328:NF-kappa B