Phosphorylation of the IDP KID Modulates Affinity for KIX by Increasing the Lifetime of the Complex.

Phosphorylation of the IDP KID Modulates Affinity for KIX by Increasing the Lifetime of the Complex.
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IDP KID 的磷酸化通过延长复合物的寿命来调节对 KIX 的亲和力。

DOI:
10.1016/j.bpj.2017.10.015
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发表时间:
2017-12-19
影响因子:
3.4
通讯作者:
Clarke J
Clarke J
中科院分区:
生物学3区
文献类型:
--
作者:
Dahal L;Shammas SL;Clarke J

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已知内在无序蛋白(IDPs)经历一系列翻译后修饰,但这种修饰通过什么机制影响IDP与其伴侣蛋白的结合?我们使用一个这样的IDP来研究这个问题,即转录因子CREB的激酶诱导结构域(KID),它在磷酸化时与CREB结合蛋白的KIX结构域相互作用。与许多其他IDPs一样,KID在与KIX相互作用时经历耦合折叠和结合形成α-螺旋结构。这种单位点磷酸化在体内的转录激活控制中起着重要作用。在这里,我们表明,与预期相反,磷酸化对结合率没有影响——未磷酸化的KID与磷酸化形式的pKID结合速度一样快——而是通过增加复合物的寿命来起作用。我们提出通过改变pKID:KIX的解离速率来控制其结合复合物的寿命,从而实现磷酸化对转录调控的有效控制。
Intrinsically disordered proteins (IDPs) are known to undergo a range of posttranslational modifications, but by what mechanism do such modifications affect the binding of an IDP to its partner protein? We investigate this question using one such IDP, the kinase inducible domain (KID) of the transcription factor CREB, which interacts with the KIX domain of CREB-binding protein upon phosphorylation. As with many other IDPs, KID undergoes coupled folding and binding to form α-helical structure upon interacting with KIX. This single site phosphorylation plays an important role in the control of transcriptional activation in vivo. Here we show that, contrary to expectation, phosphorylation has no effect on association rates—unphosphorylated KID binds just as rapidly as pKID, the phosphorylated form—but rather, acts by increasing the lifetime of the complex. We propose that by controlling the lifetime of the bound complex of pKID:KIX via altering the dissociation rate, phosphorylation can facilitate effective control of transcription regulation.
PKID通过非本地相互作用的非结构化过渡状态与KIX结合。
DOI: 10.1016/j.bpj.2017.10.016
发表时间: 2017-12-19
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