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首页> 外文期刊>Neuron >The synaptotagmin C2A domain is part of the calcium sensor controlling fast synaptic transmission.
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The synaptotagmin C2A domain is part of the calcium sensor controlling fast synaptic transmission.

机译:突触标签蛋白C2A域是控制快速突触传递的钙传感器的一部分。

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Synaptotagmin is a synaptic vesicle protein that has been proposed to be the calcium sensor responsible for fast neurotransmitter release at synapses. Synaptotagmin's two C2 domains, C2A and C2B, each provide a calcium binding pocket lined with negative charges contributed by five conserved aspartates. We find that even when all of C2A's conserved aspartates are neutralized by replacement with asparagines, neurotransmitter release still occurs at hippocampal synapses in culture. Because exocytosis continues to be dependent on extracellular calcium concentration, the C2A domain cannot represent the entire calcium sensor. C2A does appear to be part of the calcium sensor, however, because substitution of D232 alters the calcium dependence of release, perhaps by reducing the number of calcium ions that must bind to trigger exocytosis. We conclude that neutralization of the negative charge at D232 by coordination of a calcium ion is necessary--but not sufficient--for fast neurotransmission at mammalian CNS synapses.
机译:Synaptotagmin是一种突触小泡蛋白,已被提出是负责在突触中快速释放神经递质的钙传感器。 Synaptotagmin的两个C2域C2A和C2B,每个都提供一个钙结合口袋,内衬由五个保守的天冬氨酸贡献的负电荷。我们发现,即使所有C2A保守的天冬氨酸都被天冬酰胺替代而中和,神经递质的释放仍然发生在培养的海马突触中。由于胞吐作用继续取决于细胞外钙浓度,因此C2A域不能代表整个钙传感器。 C2A似乎确实是钙传感器的一部分,因为D232的取代改变了钙的释放依赖性,可能是通过减少必须结合才能触发胞吐作用的钙离子的数量。我们得出的结论是,通过钙离子的配位作用中和D232处的负电荷对于哺乳动物中枢神经系统突触的快速神经传递是必要的,但还不够。

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