Dimeric heat shock protein 40 binds radial spokes for generating coupled power strokes and recovery strokes of 9 + 2 flagella.

Dimeric heat shock protein 40 binds radial spokes for generating coupled power strokes and recovery strokes of 9 + 2 flagella.
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DOI:
10.1083/jcb.200705069
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发表时间:
2008-01-28
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Yang P
Yang P
中科院分区:
其他
文献类型:
--
作者:
Yang C;Owen HA;Yang P

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T形辐射辐条调节鞭毛跳动。然而,这些辐条的确切功能和分子机制仍不清楚。有趣的是,莱茵衣藻鞭毛缺乏二聚体热休克蛋白(HSP)40在辐头辐柄交界处出现正常的长度和组成,但积极抽搐,而细胞抖动没有游行,类似于一个中心对(CP)突变。HSP 40 −细胞在重组HSP 40电穿孔后开始游动。令人惊讶的是,救援并不需要DnaJ域的签名。此外,His-Pro-Asp三肽,这是必不可少的刺激HSP 70腺苷三磷酸酶分歧的候选直系同源物,包括人DnaJB 13。视频显微镜显示,尽管波形相当正常,但弯曲的启动和传播以及不规则的失速和冲程切换存在犹豫。体内证据表明,进化上保守的HSP 40特异性地将多个辐条蛋白转化成能够机械地将CP与动力蛋白马达偶联的稳定构象。这使得9 + 2纤毛和鞭毛能够弯曲并切换以产生交替的动力冲程和恢复冲程。
T-shape radial spokes regulate flagellar beating. However, the precise function and molecular mechanism of these spokes remain unclear. Interestingly, Chlamydomonas reinhardtii flagella lacking a dimeric heat shock protein (HSP) 40 at the spokehead–spokestalk juncture appear normal in length and composition but twitch actively while cells jiggle without procession, resembling a central pair (CP) mutant. HSP40− cells begin swimming upon electroporation with recombinant HSP40. Surprisingly, the rescue doesn't require the signature DnaJ domain. Furthermore, the His-Pro-Asp tripeptide that is essential for stimulating HSP70 adenosine triphosphatase diverges in candidate orthologues, including human DnaJB13. Video microscopy reveals hesitance in bend initiation and propagation as well as irregular stalling and stroke switching despite fairly normal waveform. The in vivo evidence suggests that the evolutionarily conserved HSP40 specifically transforms multiple spoke proteins into stable conformation capable of mechanically coupling the CP with dynein motors. This enables 9 + 2 cilia and flagella to bend and switch to generate alternate power strokes and recovery strokes.
弯曲传播驱动中央对旋转中的中央对旋转。
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