Subunit interactions within the Chlamydomonas flagellar spokehead.

Subunit interactions within the Chlamydomonas flagellar spokehead.
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DOI:
10.1002/cm.20507
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发表时间:
2011-04
期刊:
影响因子:
2.9
通讯作者:
Kamiya, Ritsu
Kamiya, Ritsu
中科院分区:
生物学4区
文献类型:
--
作者:
Kohno, Takahiro;Wakabayashi, Ken-ichi;Diener, Dennis R.;Rosenbaum, Joel L.;Kamiya, Ritsu

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纤毛和鞭毛中的辐射辐(RS)/中心对(CP)系统在动力蛋白(驱动纤毛/鞭毛运动的马达蛋白)的力产生调节中起着至关重要的作用。CP和RS的远端部分(辐头)之间的机械和机械化学相互作用对于这种控制至关重要;然而,相互作用的细节完全未知。作为理解RS-CP相互作用的第一步,我们研究了五种辐头蛋白(辐射辐蛋白(RSP)1,RSP 4,RSP 6,RSP 9和RSP 10)和三种辐柄蛋白(RSP 2,RSP 5和RSP 23)之间的蛋白质-蛋白质相互作用,所有这些蛋白质都表达为重组蛋白。通过电穿孔介导的蛋白质递送到各自蛋白质缺陷的突变体中,其中三种显示出具有生理活性。Glucose S-转移酶下拉试验在体外检测到的64对重组体中的10对的相互作用。此外,使用五种试剂的轴丝的化学交联检测RS亚基之间的7种相互作用原位。最后,在重组辐头亚基的混合物中,RSP 1、RSP 4、RSP 6和RSP 9形成7- 10 S复合物,如蔗糖密度梯度离心所检测的。它可能代表一个部分大会的辐条头。从这些结果中,我们提出了一个模型的相互作用之间发生的辐头亚基。
The radial spoke (RS)/central pair (CP) system in cilia and flagella plays an essential role in the regulation of force generation by dynein, the motor protein that drives cilia/flagella movements. Mechanical and mechanochemical interactions between the CP and the distal part of the RS, the spokehead, should be crucial for this control; however, the details of interaction are totally unknown. As an initial step toward an understanding of the RS-CP interaction, we examined the protein-protein interactions between the five spokehead proteins (radial spoke protein (RSP)1, RSP4, RSP6, RSP9, and RSP10) and three spoke stalk proteins (RSP2, RSP5 and RSP23), all expressed as recombinant proteins. Three of them were shown to have physiological activities by electroporation-mediated protein delivery into mutants deficient in the respective proteins. Glutathione S-transferase pulldown assays in vitro detected interactions in 10 out of 64 pairs of recombinants. In addition, chemical crosslinking of axonemes using five reagents detected seven kinds of interactions between the RS subunits in situ. Finally, in the mixture of the recombinant spokehead subunits, RSP1, RSP4, RSP6, and RSP9 formed a 7-10S complex as detected by sucrose density gradient centrifugation. It may represent a partial assembly of the spokehead. From these results, we propose a model of interactions taking place between the spokehead subunits.
DOI: 10.1002/cm.1028
发表时间: 2001-07-01
影响因子: --
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