Spinophilin directs protein phosphatase 1 specificity by blocking substrate binding sites.

Spinophilin directs protein phosphatase 1 specificity by blocking substrate binding sites.
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DOI:
10.1038/nsmb.1786
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发表时间:
2010-04
影响因子:
16.8
通讯作者:
--
中科院分区:
生物学1区
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丝氨酸/苏氨酸蛋白磷酸酶1(PP 1)使数百个关键生物靶标去磷酸化。PP 1与200多个调节蛋白结合,形成高度特异性的全酶。这些调节蛋白将PP 1靶向到其在细胞内的作用点,并引发其对特定底物的酶特异性。然而,它们如何指导PP 1的特异性尚不清楚。在这里,我们表明,spinophilin,神经元PP 1调节器,是完全非结构化的,在其未结合的形式和结合PP 1,通过折叠后结合机制,在一个细长的方式,阻止PP 1的三个假定的底物结合位点之一,而不改变其活性位点。这种结合模式足以使亲棘素在体外限制PP 1对模型底物的活性,而不影响其使神经元底物GluR 1去磷酸化的能力。因此,我们的工作提供了分子基础的能力,spinophilin支配PP 1底物特异性。
The serine/threonine Protein Phosphatase 1 (PP1) dephosphorylates hundreds of key biological targets. PP1 associates with ≥200 regulatory proteins to form highly specific holoenzymes. These regulatory proteins target PP1 to its point of action within the cell and prime its enzymatic specificity for particular substrates. However, how they direct PP1’s specificity is not understood. Here we show that spinophilin, a neuronal PP1 regulator, is entirely unstructured in its unbound form and binds PP1, through a folding-upon-binding mechanism, in an elongated fashion, blocking one of PP1’s three putative substrate binding sites, without altering its active site. This mode of binding is sufficient for spinophilin to restrict PP1’s activity toward a model substrate in vitro, without affecting its ability to dephosphorylate its neuronal substrate GluR1. Thus, our work provides the molecular basis for the ability of spinophilin to dictate PP1 substrate specificity.
DOI: 10.1016/j.neuron.2008.02.006
发表时间: 2008-04-24
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