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:
Biochimica et biophysica acta
影响因子:
--
通讯作者:
Klempnauer K-H
Klempnauer K-H
中科院分区:
--
文献类型:
--
作者:
Dukare S;Klempnauer K-H

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转录因子c-Myb在控制造血祖细胞的增殖和分化中起关键作用,并且与白血病和某些非造血肿瘤的发展有关。c-Myb活性高度依赖于与辅激活因子p300的相互作用,其由c-Myb的反式激活结构域和p300的KIX结构域介导。我们以前已经观察到,保守的疏水氨基酸的保守伸展中的保守的缬氨酸到异亮氨酸氨基酸取代对Myb活性具有深远的影响。在这里,我们已经探索了疏水区作为蛋白质-蛋白质相互作用的介质的功能。我们表明,疏水区促进Myb自我相互作用和组蛋白乙酰转移酶Tip 60,以前确定的Myb相互作用蛋白的结合。我们表明,这些相互作用的缬氨酸到异亮氨酸氨基酸取代和抑制Myb活性的干扰Myb和KIX结构域的p300的相互作用的影响。两者合计,我们的工作确定了在Myb的反式激活结构域的疏水区域作为一个结合位点的同源和异源蛋白质的相互作用,并导致图片的c-Myb的反式激活结构域作为一个复合蛋白质的结合区域,促进相互依赖的蛋白质-蛋白质相互作用的Myb与调节蛋白。
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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