A conserved patch of hydrophobic amino acids modulates Myb activity by mediating protein-protein interactions.
A conserved patch of hydrophobic amino acids modulates Myb activity by mediating protein-protein interactions.
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疏水性氨基酸的保守片段通过介导蛋白质-蛋白质相互作用来调节 Myb 活性
DOI:
10.1016/j.bbagrm.2016.04.004
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发表时间:
2016
期刊:
影响因子:
--
通讯作者:
Klempnauer K-H
中科院分区:
文献类型:
--
作者:
Dukare S;Klempnauer K-H
The transcription factor c-Myb plays a key role in the control of proliferation and differentiation in hematopoietic progenitor cells and has been implicated in the development of leukemia and certain non-hematopoietic tumors. c-Myb activity is highly dependent on the interaction with the coactivator p300 which is mediated by the transactivation domain of c-Myb and the KIX domain of p300. We have previously observed that conservative valine-to-isoleucine amino acid substitutions in a conserved stretch of hydrophobic amino acids have a profound effect on Myb activity. Here, we have explored the function of the hydrophobic region as a mediator of protein–protein interactions. We show that the hydrophobic region facilitates Myb self-interaction and binding of the histone acetyl transferase Tip60, a previously identified Myb interacting protein. We show that these interactions are affected by the valine-to-isoleucine amino acid substitutions and suppress Myb activity by interfering with the interaction of Myb and the KIX domain of p300. Taken together, our work identifies the hydrophobic region in the Myb transactivation domain as a binding site for homo- and heteromeric protein interactions and leads to a picture of the c-Myb transactivation domain as a composite protein binding region that facilitates interdependent protein–protein interactions of Myb with regulatory proteins.
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