Agonist-independent GPCR activity regulates anterior-posterior targeting of olfactory sensory neurons.

Agonist-independent GPCR activity regulates anterior-posterior targeting of olfactory sensory neurons.
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DOI:
10.1016/j.cell.2013.08.033
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发表时间:
2013-09-12
期刊:
影响因子:
64.5
通讯作者:
Sakano H
Sakano H
中科院分区:
生物学1区
文献类型:
--
作者:
Nakashima A;Takeuchi H;Imai T;Saito H;Kiyonari H;Abe T;Chen M;Weinstein LS;Yu CR;Storm DR;Nishizumi H;Sakano H

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已知G蛋白偶联受体(GPCR)具有两种不同的构象,活性和非活性,并且在不存在配体的情况下自发地在两者之间交替。在这里,我们分析了激动剂非依赖性GPCR活性在受体指导的轴突投射中的可能作用。我们产生了表达β 2-肾上腺素能受体的活性突变体的转基因小鼠,β 2-肾上腺素能受体是一种与气味受体(OR)具有最高同源性的充分表征的GPCR。我们发现具有改变的激动剂非依赖性活性的突变体改变了轴突靶向分子的转录水平,例如,Neuropilin-1和丛蛋白-A1,但不是肾小球分离分子,例如,因此,Kirrel 2和Kirrel 3引起肾小球位置沿前后(A-P)轴沿着移动。敲除和体外实验表明,Gs,而不是高尔夫,是负责介导的激动剂独立的GPCR活性。我们的结论是,由每个OR设置的构象转换的平衡是A-P靶向分子的表达水平的主要决定因素。
G-protein coupled receptors (GPCRs) are known to possess two different conformations, active and inactive, and spontaneously alternate between the two in the absence of ligands. Here, we analyzed the agonist-independent GPCR activity for its possible role in receptor-instructed axonal projection. We generated transgenic mice expressing activity mutants of the β2-adrenergic receptor, a well-characterized GPCR with the highest homology to odorant receptors (ORs). We found that mutants with altered agonist-independent activity changed the transcription levels of axon targeting molecules, e.g., Neuropilin-1 and Plexin-A1, but not of glomerular segregation molecules, e.g., Kirrel2 and Kirrel3, thus, causing shifts in glomerular locations along the anterior-posterior (A-P) axis. Knockout and in vitro experiments demonstrated that Gs, but not Golf, is responsible for mediating the agonist-independent GPCR activity. We conclude that the equilibrium of conformational transitions set by each OR is the major determinant of expression levels of A-P targeting molecules.
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