Variant ionotropic glutamate receptors as chemosensory receptors in Drosophila.

Variant ionotropic glutamate receptors as chemosensory receptors in Drosophila.
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DOI:
10.1016/j.cell.2008.12.001
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发表时间:
2009-01-09
期刊:
影响因子:
64.5
通讯作者:
Vosshall LB
Vosshall LB
中科院分区:
生物学1区
文献类型:
--
作者:
Benton R;Vannice KS;Gomez-Diaz C;Vosshall LB

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离子型谷氨酸受体(iGluRs)介导脊椎动物和无脊椎动物神经系统中突触处的神经元通讯。我们在果蝇中发现了一个新的iGluR相关基因家族,我们将其命名为离子型受体(IR)。这些受体不属于充分描述的红藻氨酸、AMPA或NMDA类iGluR,并且具有不同的配体结合结构域,其缺乏其特征性谷氨酸相互作用残基。IR在感觉神经元中以组合方式表达,这些感觉神经元对许多不同的气味做出反应,但不表达昆虫气味受体(OR)或味觉受体(GR)。IR蛋白积聚在感觉树突而不是突触中。IR的错误表达诱导异位神经元的新气味反应。总之,这些结果使我们提出,IR包括一个新的化学感受受体家族。IR/iGluR相关蛋白在细菌、植物和动物中的保守性表明,这种受体家族代表了一种进化上古老的机制,用于感知内部和外部的化学信号。
Ionotropic glutamate receptors (iGluRs) mediate neuronal communication at synapses throughout vertebrate and invertebrate nervous systems. We have characterized a novel family of iGluR-related genes in Drosophila, which we name Ionotropic Receptors (IRs). These receptors do not belong to the well-described Kainate, AMPA, or NMDA classes of iGluRs, and have divergent ligand-binding domains that lack their characteristic glutamate-interacting residues. IRs are expressed in a combinatorial fashion in sensory neurons that respond to many distinct odors but do not express either insect odorant receptors (ORs) or gustatory receptors (GRs). IR proteins accumulate in sensory dendrites and not at synapses. Mis-expression of IRs induces novel odor responses in ectopic neurons. Together, these results lead us to propose that the IRs comprise a novel family of chemosensory receptors. Conservation of IR/iGluR-related proteins in bacteria, plants, and animals suggests that this receptor family represents an evolutionarily ancient mechanism for sensing both internal and external chemical cues.
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