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首页> 外文期刊>Journal of Parasitology >GpMyoF, a WD40 Repeat-Containing Myosin Associated with the Myonemes of Gregarina polymorpha
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GpMyoF, a WD40 Repeat-Containing Myosin Associated with the Myonemes of Gregarina polymorpha

机译:GpMyoF,WD40重复含有肌球蛋白与Gregarina polymorpha的Myonemes相关联。

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摘要

This study presents the first characterization of a WD40 repeat-containing myosin identified in the apicomplexan parasite Gregarina polymorpha. This 222.7 kDa myosin, GpMyoF, contains a canonical myosin motor domain, a neck domain with 6 IQ motifs, a tail domain containing short regions of predicted coiled-coil structure, and, most notably, multiple WD40 repeats at the C-terminus. In other proteins such repeats assemble into a β-propeller structure implicated in mediating protein-protein interactions. Confocal microscopy suggests that GpMyoF is localized to the annular myonemes that gird the parasite cortex. Extraction studies indicate that this myosin shows an unusually tight association with the cytoskeletal fraction and can be solubilized only by treatment with high pH (11.5) or the anionic detergent sarkosyl. This novel myosin and its homologs, which have been identified in several related genera, appear to be unique to the Apicomplexa and represent the only myosins known to contain the WD40 domain. The function of this myosin in G. polymorpha or any of the other apicomplexan parasites remains uncertain.
机译:这项研究提出了在apicomplexan寄生虫Gregarina polymorpha中鉴定出的含有WD40重复序列的肌球蛋白的首次表征。这个222.7 kDa的肌球蛋白GpMyoF包含一个典型的肌球蛋白运动结构域,一个具有6个IQ模体的颈部结构域,一个包含预测的卷曲螺旋结构短区域的尾部结构域,最值得注意的是在C末端存在多个WD40重复序列。在其他蛋白质中,此类重复序列组装成β螺旋桨结构,与介导蛋白质-蛋白质相互作用有关。共聚焦显微镜表明,GpMyoF定位于束缚寄生虫皮层的环形肌内膜。提取研究表明,该肌球蛋白显示出与细胞骨架部分异常紧密的缔合,并且只有通过用高pH(11.5)或阴离子去污剂沙克糖基处理才能溶解。这种新型的肌球蛋白及其同源物已在几个相关属中鉴定出来,似乎对蚜虫复合体而言是独特的,并且是已知唯一包含WD40结构域的肌球蛋白。该肌球蛋白在多态G.或其他任何apiapiplexan寄生虫中的功能仍不确定。

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