The motor activity of myosin-X promotes actin fiber convergence at the cell periphery to initiate filopodia formation.

The motor activity of myosin-X promotes actin fiber convergence at the cell periphery to initiate filopodia formation.
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DOI:
10.1083/jcb.200703178
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发表时间:
2007-10-22
影响因子:
7.8
通讯作者:
Ikebe, Mitsuo
Ikebe, Mitsuo
中科院分区:
生物学1区
文献类型:
--
作者:
Tokuo, Hiroshi;Mabuchi, Katsuhide;Ikebe, Mitsuo

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丝状伪足是在迁移细胞的前缘发现的富含肌动蛋白的指状突起,被认为在方向感测中起作用。先前的研究已经表明,肌球蛋白-X(myoX)促进丝状伪足形成,并且这是通过其向细胞外周递送特定货物的能力介导的(Tokuo,H.,和M.池部2004.生物化学和生物物理。Commun. 319:214-220; Zhang,H.,J.S.贝格,Z. Li,Y. Wang,P. Lang,A.D. Sousa,A. Bhaskar,R.E.切尼和S.斯特龙布拉德2004. Nat.CellBiol.6:523-531; Bohil,A.B.,B.W. Robertson和R.E.切尼。2006. Proc. Natl. Acad. Sci. USA. 103:12411-12416; Zhu,X.J.,C. Z王永庆戴,Y. Xie,N.N.宋,Y。Liu,Q.S.杜湖,澳-地Mei,Y.Q. Ding和W.C.雄2007. 9:184-192)。在这项研究中,我们表明,myoX的运动功能,而不是货物功能是启动丝状伪足形成的关键。使用二聚体诱导技术,我们发现,myoX缺乏其货物结合尾巴横向移动板状伪足的前缘,并诱导活细胞中的丝状伪足。我们的结论是,双头形式的myoX的运动功能是至关重要的肌动蛋白重组的前沿,导致丝状伪足的形成。
Filopodia are actin-rich fingerlike protrusions found at the leading edge of migrating cells and are believed to play a role in directional sensing. Previous studies have shown that myosin-X (myoX) promotes filopodia formation and that this is mediated through its ability to deliver specific cargoes to the cell periphery (Tokuo, H., and M. Ikebe. 2004. Biochem Biophys. Commun. 319:214–220; Zhang, H., J.S. Berg, Z. Li, Y. Wang, P. Lang, A.D. Sousa, A. Bhaskar, R.E. Cheney, and S. Stromblad. 2004. Nat. Cell Biol. 6:523–531; Bohil, A.B., B.W. Robertson, and R.E. Cheney. 2006. Proc. Natl. Acad. Sci. USA. 103:12411–12416; Zhu, X.J., C.Z. Wang, P.G. Dai, Y. Xie, N.N. Song, Y. Liu, Q.S. Du, L. Mei, Y.Q. Ding, and W.C. Xiong. 2007. Nat. Cell Biol. 9:184–192). In this study, we show that the motor function of myoX and not the cargo function is critical for initiating filopodia formation. Using a dimer-inducing technique, we find that myoX lacking its cargo-binding tail moves laterally at the leading edge of lamellipodia and induces filopodia in living cells. We conclude that the motor function of the two-headed form of myoX is critical for actin reorganization at the leading edge, leading to filopodia formation.
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