Spire and Formin 2 Synergize and Antagonize in Regulating Actin Assembly in Meiosis by a Ping-Pong Mechanism

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Spire and Formin 2 Synergize and Antagonize in Regulating Actin Assembly in Meiosis by a Ping-Pong Mechanism

In mammalian oocytes, three actin binding proteins, Formin 2 (Fmn2), Spire, and profilin, synergistically organize a dynamic cytoplasmic actin meshwork that mediates translocation of the spindle toward the cortex and is required for successful fertilization. Here we characterize Fmn2 and elucidate the molecular mechanism for this synergy, using bulk solution and individual filament kinetic meas...

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Analysis of the function of Spire in actin assembly and its synergy with formin and profilin.

The Spire protein, together with the formin Cappuccino and profilin, plays an important role in actin-based processes that establish oocyte polarity. Spire contains a cluster of four actin-binding WH2 domains. It has been shown to nucleate actin filaments and was proposed to remain bound to their pointed ends. Here we show that the multifunctional character of the WH2 domains allows Spire to se...

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ژورنال

عنوان ژورنال: PLoS Biology

سال: 2014

ISSN: 1545-7885

DOI: 10.1371/journal.pbio.1001795