Background: Rho family GTPases regulate Entamoeba histolytica pathogenesis. Results: Despite Ras-like structural features and fast intrinsic nucleotide exchange, EhRho1 engages classical Rho effectors and regulates actin. Conclusion: EhRho1 is a true Rho family GTPase with a unique mode of nucleotide interaction. Significance: Possibly representing an early Rho subfamily divergence from the Ras superfamily, EhRho1 likely regulates actin polymerization in E. histolytica.
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