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. 1996 Aug 6;93(16):8536–8540. doi: 10.1073/pnas.93.16.8536

Sin3 corepressor function in Myc-induced transcription and transformation.

S E Harper 1, Y Qiu 1, P A Sharp 1
PMCID: PMC38707  PMID: 8710905

Abstract

Many basic-helix-loop-helix-leucine zipper (b-HLH-LZ) proteins, including the Myc family and non-Myc family, bind a common DNA sequence CACGTG, yet have quite different biological actions. Myc binds this sequence as a heterodimer with Max in the activation of both transcription and transformation. The Myc family members Mad and Mxi1 are known to suppress Myc-induced transcription and transformation and to dimerize with Max to form ternary complexes with the mammalian Sin3 transcriptional corepressor (mSin3). The b-HLH-LZ domain of TFEB, which cannot heterodimerize within the Myc family, does not suppress Myc-induced transcription or transformation. However, transfer of a 25- to 36-aa region from Mad or Mxi1, which interacts with mSin3, to the b-HLH-LZ of TFEB, mediated profound suppression of Myc-induced transcription and transformation. These results suggest that the DNA binding specificities of the Myc family and non-Myc family b-HLH-LZ proteins, in the context of the cellular genes involved in Myc-induced transformation, are shared. The results also demonstrate that targeting mSin3 to CACGTG sites via a non-Myc family DNA binding domain is sufficient to oppose Myc activity in growth regulation.

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Selected References

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