NMDA receptor activation requires remodelling of intersubunit contacts within ligand-binding heterodimers.
NMDA receptor activation requires remodelling of intersubunit contacts within ligand-binding heterodimers.
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NMDA受体激活需要在配体结合异二聚体内重塑亚基间接触。
DOI:
10.1038/ncomms1512
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发表时间:
2011-10-11
影响因子:
16.6
通讯作者:
中科院分区:
文献类型:
--
作者:
Two classes of glutamate-activated channels mediate excitation at central synapses: N-methyl-d-aspartic acid (NMDA) receptors and non-NMDA receptors. Despite substantial structural homology, each class generates signals with characteristic kinetics and mediates distinct synaptic functions. In non-NMDA receptors, the strength of inter-subunit contacts within agonist-binding domains is inversely correlated with functional desensitization. Here we test how the strength of these contacts affects NMDA receptor activation by combining mutagenesis and single-channel current analyses. We show that receptors with covalently linked dimers had dramatically lower activity due to high barriers to opening and unstable open states but had intact desensitization. Based on these observations, we suggest that in NMDA receptors rearrangements at the heterodimer interface represent an early and integral step of the opening sequence but are not required for desensitization. These results demonstrate distinct functional roles in the activation of NMDA and non-NMDA glutamate-gated channels for largely conserved inter-subunit contacts.
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影响因子:
5.7
作者:
Mayer ML
通讯作者:
Mayer ML
影响因子:
3.4
作者:
Amico-Ruvio, Stacy A.;Popescu, Gabriela K.
通讯作者:
Popescu, Gabriela K.
影响因子:
16.2
作者:
Priel, Avi;Selak, Sanja;Stern-Bach, Yael
通讯作者:
Stern-Bach, Yael
影响因子:
5.3
作者:
Kussius, Cassandra L.;Popescu, Gabriela K.
通讯作者:
Popescu, Gabriela K.
影响因子:
5.3
作者:
Kussius, Cassandra L.;Kaur, Navjot;Popescu, Gabriela K.
通讯作者:
Popescu, Gabriela K.