Multiple direct interactions of TBP with the MYC oncoprotein.Wei, Y., Resetca, D., Li, Z., Johansson-Akhe, I., Ahlner, A., Helander, S., Wallenhammar, A., Morad, V., Raught, B., Wallner, B., Kokubo, T., Tong, Y., Penn, L.Z., Sunnerhagen, M.
(2019) Nat Struct Mol Biol 26: 1035-1043
- PubMed: 31686052
- DOI: https://doi.org/10.1038/s41594-019-0321-z
- Primary Citation of Related Structures:
- PubMed Abstract:
Transcription factor c-MYC is a potent oncoprotein; however, the mechanism of transcriptional regulation via MYC-protein interactions remains poorly understood. The TATA-binding protein (TBP) is an essential component of the transcription initiation complex TFIID and is required for gene expression. We identify two discrete regions mediating MYC-TBP interactions using structural, biochemical and cellular approaches. A 2.4 -Å resolution crystal structure reveals that human MYC amino acids 98-111 interact with TBP in the presence of the amino-terminal domain 1 of TBP-associated factor 1 (TAF1 TAND1 ). Using biochemical approaches, we have shown that MYC amino acids 115-124 also interact with TBP independently of TAF1 TAND1 . Modeling reveals that this region of MYC resembles a TBP anchor motif found in factors that regulate TBP promoter loading. Site-specific MYC mutants that abrogate MYC-TBP interaction compromise MYC activity. We propose that MYC-TBP interactions propagate transcription by modulating the energetic landscape of transcription initiation complex assembly.
Department of Physics, Chemistry, and Biology, Linköping University, Linköping, Sweden.