SAP102 mediates synaptic clearance of NMDA receptors.

SAP102 mediates synaptic clearance of NMDA receptors.
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DOI:
10.1016/j.celrep.2012.09.024
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发表时间:
2012-11-29
期刊:
影响因子:
8.8
通讯作者:
Roche KW
Roche KW
中科院分区:
生物学1区
文献类型:
--
作者:
Chen BS;Gray JA;Sanz-Clemente A;Wei Z;Thomas EV;Nicoll RA;Roche KW

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膜相关鸟苷酸激酶(MAGUKs)是突触后密度的主要支架蛋白家族。PSD-MAGUK亚家族包括PSD-95、PSD-93、SAP97和SAP102,被广泛认为主要参与许多蛋白质的突触锚定,包括n -甲基- d -天冬氨酸受体(NMDARs)。值得注意的是,NMDARs的突触靶向依赖于GluN2B亚基上的PDZ配体与MAGUK PDZ结构域的结合,因为这种相互作用的破坏会显著降低NMDAR表面和突触的表达。我们最近报道了SAP102和GluN2B之间的二次相互作用,除了PDZ相互作用。在这里,我们确定了GluN2B上负责非pdz与SAP102结合的两个关键残基。值得注意的是,无论是这些关键残基的突变,还是内源性SAP102的敲除,都可以挽救PDZ结合缺陷GluN2B的缺陷表面表达和突触定位。这些数据揭示了SAP102在含有glun2b的NMDARs的突触清除中具有意想不到的非支架作用。
Membrane-associated guanylate kinases (MAGUKs) are the major family of scaffolding proteins at the postsynaptic density. The PSD-MAGUK subfamily, which includes PSD-95, PSD-93, SAP97 and SAP102, is well accepted to be primarily involved in the synaptic anchoring of numerous proteins, including N-methyl-D-aspartate receptors (NMDARs). Notably, the synaptic targeting of NMDARs depends on the binding of the PDZ ligand on the GluN2B subunit to MAGUK PDZ domains as disruption of this interaction dramatically decreases NMDAR surface and synaptic expression. We recently reported a secondary interaction between SAP102 and GluN2B, in addition to the PDZ interaction. Here, we identify two critical residues on GluN2B responsible for the non-PDZ binding to SAP102. Strikingly, either mutation of these critical residues or knock-down of endogenous SAP102 can rescue the defective surface expression and synaptic localization of PDZ binding-deficient GluN2B. These data reveal an unexpected, non-scaffolding role for SAP102 in the synaptic clearance of GluN2B-containing NMDARs.
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