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Mol. Cell. Biol., Apr 1996, 1367-1375, Vol 16, No. 4
Copyright © 1996, American Society for Microbiology

Functional domains of the transcription factor USF2: atypical nuclear localization signals and context-dependent transcriptional activation domains

X Luo and M Sawadogo
Department of Molecular Genetics, The University of Texas M.D. Anderson Cancer Center, Houston, 77030, USA.

USF is a family of basic helix-loop transcriptional factors that recognizes DNA-binding sites similar to those of the Myc oncoproteins. Here, various functional domains in the mouse USF2 protein were identified and characterized. Indirect immunofluorescence studies with transiently transfected cells revealed that both the basic region and the highly conserved USF-specific region (USR) are involved in the nuclear localization of USF2. Cotransfection assays with deletion mutants containing the DNA-binding domain of either USF2 or GAL4 identified two distinct transcriptional activation domains in USF2, the USR and the exon 5-encoded region. Activity of the exon 5 activation domain was detectable in both assay systems. Within USF2, however, its potency varied with the conformation induced by the surrounding regions, especially that encoded by alternatively spliced exon 4. In contrast, the USR activated transcription only in its natural context upstream of the USF2 basic region and only with reporter constructs containing the adenovirus major late minimal promoter but not the E1b minimal promoter. However, insertion of an initiator element downstream of the TATA box rescued the activity of the USR on the E1b-driven reporters. The USR therefore represents a new type of activation domain whose function depends very strongly on the core promoter context.

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