Functional modulation of IFT kinesins extends the sensory repertoire of ciliated neurons in Caenorhabditis elegans.

Functional modulation of IFT kinesins extends the sensory repertoire of ciliated neurons in Caenorhabditis elegans.
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IFT驱动素的功能调节扩展了秀丽隐杆线虫中纤毛神经元的感觉曲目。

DOI:
10.1083/jcb.200509115
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发表时间:
2006-02-27
影响因子:
7.8
通讯作者:
Scholey, JM
Scholey, JM
中科院分区:
生物学1区
文献类型:
--
作者:
Evans, JE;Snow, JJ;Gunnarson, AL;Ou, GS;Stahlberg, H;McDonald, KL;Scholey, JM

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秀丽隐杆线虫神经元上感觉纤毛的多样性使动物能够检测到各种感觉刺激。感觉纤毛由鞭毛内运输 (IFT) 驱动蛋白组装,该驱动蛋白沿着纤毛轴丝运输与 IFT 颗粒结合的纤毛前体,以纳入纤毛结构。使用活体动物的荧光显微镜和高压冷冻、冷冻取代的IFT运动突变体的连续切片电子显微镜,我们发现两种IFT驱动蛋白,同二聚体OSM-3驱动蛋白和异三聚体驱动蛋白II,以部分冗余的方式发挥作用来构建全长两栖动物通道纤毛,但对于构​​建全长两栖动物翅膀(AWC)纤毛来说是完全冗余的。这种差异反映了 OSM-3 活性中纤毛特异性的差异,OSM-3 活性可以延长通道纤毛中的远端单线,但不能延长 AWC 纤毛的远端单线,因为 AWC 纤毛缺乏这种单线。此外,AWC 特异性趋化测定揭示了这些翼纤毛中驱动蛋白 II 的新感觉功能。我们认为驱动蛋白 II 是“典型”IFT 马达,而 OSM-3 是“辅助”IFT 马达,这些 IFT 驱动蛋白的部署或动作的细微变化可能导致纤毛形态、纤毛功能和感觉知觉的差异。
The diversity of sensory cilia on Caenorhabditis elegans neurons allows the animal to detect a variety of sensory stimuli. Sensory cilia are assembled by intraflagellar transport (IFT) kinesins, which transport ciliary precursors, bound to IFT particles, along the ciliary axoneme for incorporation into ciliary structures. Using fluorescence microscopy of living animals and serial section electron microscopy of high pressure–frozen, freeze-substituted IFT motor mutants, we found that two IFT kinesins, homodimeric OSM-3 kinesin and heterotrimeric kinesin II, function in a partially redundant manner to build full-length amphid channel cilia but are completely redundant for building full-length amphid wing (AWC) cilia. This difference reflects cilia-specific differences in OSM-3 activity, which serves to extend distal singlets in channel cilia but not in AWC cilia, which lack such singlets. Moreover, AWC-specific chemotaxis assays reveal novel sensory functions for kinesin II in these wing cilia. We propose that kinesin II is a “canonical” IFT motor, whereas OSM-3 is an “accessory” IFT motor, and that subtle changes in the deployment or actions of these IFT kinesins can contribute to differences in cilia morphology, cilia function, and sensory perception.
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发表时间: 1993-08-13
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