6e16 | pdb_00006e16
Ternary structure of c-Myc-TBP-TAF1
Structural highlights
Function[TAF1_YEAST] Functions as a component of the DNA-binding general transcription factor complex TFIID. Binding of TFIID to a promoter (with or without TATA element) is the initial step in pre-initiation complex (PIC) formation. TFIID plays a key role in the regulation of gene expression by RNA polymerase II through different activities such as transcription activator interaction, core promoter recognition and selectivity, TFIIA and TFIIB interaction, chromatin modification (histone acetylation by TAF1), facilitation of DNA opening and initiation of transcription.[1] [2] [3] [4] Publication Abstract from PubMedTranscription 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 -A 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. 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 LZ, Sunnerhagen M Nat Struct Mol Biol. 2019 Nov;26(11):1035-1043. doi: 10.1038/s41594-019-0321-z., Epub 2019 Nov 4. PMID:31686052[5] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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