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The Outer Dynein Arm-Docking Complex: Composition and Characterization of a Subunit (Oda1) Necessary for Outer Arm Assembly

机译:Dynein外臂对接复合体:外臂组装所必需的亚基(Oda1)的组成和表征

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摘要

To learn more about how dyneins are targeted to specific sites in the flagellum, we have investigated a factor necessary for binding of outer arm dynein to the axonemal microtubules of Chlamydomonas. This factor, termed the outer dynein arm-docking complex (ODA-DC), previously was shown to be missing from axonemes of the outer dynein armless mutants oda1 and oda3. We have now partially purified the ODA-DC, determined that it contains equimolar amounts of Mr ∼105,000 and ∼70,000 proteins plus a third protein of Mr ∼25,000, and found that it is associated with the isolated outer arm in a 1:1 molar ratio. We have cloned a full-length cDNA encoding the Mr ∼70,000 protein; the sequence predicts a 62.5-kDa protein with potential homologs in higher ciliated organisms, including humans. Sequencing of corresponding cDNA from strain oda1 revealed it has a mutation resulting in a stop codon just downstream of the initiator ATG; thus, it is unable to make the full-length Mr ∼70,000 protein. These results demonstrate that the ODA1 gene encodes the Mr ∼70,000 protein, and that the protein is essential for assembly of the ODA-DC and the outer dynein arm onto the doublet microtubule.
机译:要了解有关动力蛋白如何靶向鞭毛中特定位点的更多信息,我们研究了将外源动力蛋白与衣藻轴突微管结合所需的因子。先前已证明外部达因无臂突变体oda1和oda3的轴突缺失了称为外部达因臂对接复合物(ODA-DC)的因素。现在,我们已经部分纯化了ODA-DC,确定其中包含等摩尔的Mr.〜105,000和〜70,000蛋白质,再加上Mr〜25,000的第三种蛋白质,并发现它与1:1摩尔的离析外臂相关比。我们已经克隆了一个全长cDNA,编码Mr〜70,000蛋白。该序列预测在较高的纤毛生物(包括人)中具有潜在同源性的62.5 kDa蛋白。菌株oda1相应cDNA的测序表明它具有一个突变,导致在起始ATG下游的终止密码子。因此,它不能产生全长约70,000的Mr蛋白。这些结果表明,ODA1基因编码了约70,000的Mr蛋白质,并且该蛋白质对于将ODA-DC和外部动力蛋白臂装配到双峰微管上是必不可少的。

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