Leu628 of the KIX domain of CBP is a key residue for the interaction with the MLL transactivation domain.

Leu628 of the KIX domain of CBP is a key residue for the interaction with the MLL transactivation domain.
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DOI:
10.1016/j.febslet.2010.10.024
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发表时间:
2010-11-19
期刊:
影响因子:
3.5
通讯作者:
Wright PE
Wright PE
中科院分区:
生物学3区
文献类型:
--
作者:
Arai M;Dyson HJ;Wright PE

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混合谱系白血病蛋白(MLL)的反式激活结构域(CREB)和CREB结合蛋白(CBP)的KIX结构域之间的物理相互作用是MLL介导的转录激活所必需的。我们通过丙氨酸扫描诱变表明,KIX的疏水表面残基,特别是L 628,对于结合MLL酶具有重要的能量。KIX-L 628 A突变体的NMR研究表明,L 628在MLL结合位点的构象转变中起着至关重要的作用,这是与MLL进行高亲和力相互作用所必需的。出乎意料的是,MLL也结合到KIX的c-Myb/pKID位点,突出了涉及内在无序的转录激活因子的相互作用的复杂性。
Physical interaction between the transactivation domain (TAD) of the mixed-lineage leukemia protein (MLL) and the KIX domain of the CREB binding protein (CBP) is necessary for MLL-mediated transcriptional activation. We show by alanine-scanning mutagenesis that hydrophobic surface residues of KIX, especially L628, are energetically important for binding the MLL TAD. NMR studies of the KIX-L628A mutant suggest that L628 plays a crucial role in conformational transitions at the MLL binding site, necessary for high affinity interactions with MLL. Unexpectedly, MLL also binds to the c-Myb/pKID site of KIX, highlighting the complex nature of interactions involving intrinsically disordered transcriptional activators.
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