Functional analysis of the Drosophila diaphanous FH protein in early embryonic development.

Functional analysis of the Drosophila diaphanous FH protein in early embryonic development.
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果蝇透明 FH 蛋白在早期胚胎发育中的功能分析。

DOI:
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发表时间:
2000
期刊:
影响因子:
4.6
通讯作者:
S. Wasserman
S. Wasserman
中科院分区:
生物学2区
文献类型:
--
作者:
K. Afshar;Bridget Stuart;S. Wasserman

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果蝇形成蛋白同源蛋白(FH)透明蛋白在胞质分裂过程中具有重要作用。为了深入了解透明质酸在胞质分裂过程中的功能,并探索其在其他过程中的作用,我们产生了缺乏透明质酸的胚胎,并分析了胚胎发生过程中三个细胞周期调节肌动蛋白介导的事件:中期沟的形成,细胞化和极细胞的形成。在dia胚胎中,这三个过程都有缺陷。肌动蛋白丝不能正常组织到中期和细胞化沟,肌动蛋白环在假定的极细胞的基部缺失。此外,启动中期沟和极细胞形成的质膜内陷缺失。野生型胚胎的免疫定位研究表明,透明定位于中期沟预计形成的网站,细胞化沟的生长尖端,和收缩环。此外,dia突变体表型揭示了透明蛋白在肌球蛋白II、苯胺醛和花生蛋白向肌动蛋白帽之间的皮质区域的募集中的作用。因此,我们的研究结果表明,透明的肌动蛋白细胞骨架组织的作用,是必不可少的许多,如果不是所有的,肌动蛋白介导的事件涉及膜内陷。基于已知的FH蛋白的生化功能,我们提出,透明作为一个调解人之间的信号分子和肌动蛋白组织者在细胞周期的特定阶段。
The Drosophila Formin Homology (FH) protein Diaphanous has an essential role during cytokinesis. To gain insight into the function of Diaphanous during cytokinesis and explore its role in other processes, we generated embryos deficient for Diaphanous and analyzed three cell-cycle-regulated actin-mediated events during embryogenesis: formation of the metaphase furrow, cellularization and formation of the pole cells. In dia embryos, all three processes are defective. Actin filaments do not organize properly to the metaphase and cellularization furrows and the actin ring is absent from the base of the presumptive pole cells. Furthermore, plasma membrane invaginations that initiate formation of the metaphase furrow and pole cells are missing. Immunolocalization studies of wild-type embryos reveal that Diaphanous localizes to the site where the metaphase furrow is anticipated to form, to the growing tip of cellularization furrows, and to contractile rings. In addition, the dia mutant phenotype reveals a role for Diaphanous in recruitment of myosin II, anillin and Peanut to the cortical region between actin caps. Our findings thus indicate that Diaphanous has a role in actin cytoskeleton organization and is essential for many, if not all, actin-mediated events involving membrane invagination. Based on known biochemical functions of FH proteins, we propose that Diaphanous serves as a mediator between signaling molecules and actin organizers at specific phases of the cell cycle.
DOI: 10.1016/s0955-0674(99)80008-8
发表时间: 1999-02-01
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期刊: Development (Cambridge, England)
影响因子: --
作者:
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