Rho GTPase family protein (Rho GTPase)

The Rho GTPase family protein comprises a subfamily of small (~20-21 kDa) monomeric G proteins within the Ras superfamily, including key members such as RhoA, Rac1, and Cdc42[2][3][1]. These enzymes function as molecular switches, cycling between an inactive GDP-bound state and an active GTP-bound state, tightly regulated by guanine nucleotide exchange factors (GEFs), GTPase-activating proteins (GAPs), and guanine nucleotide dissociation inhibitors (GDIs)[3]. Rho GTPases are central to transducing signals that regulate the actin cytoskeleton, affecting cell shape, motility, polarity, division, and gene expression[2][3][4]. Their dysregulation is implicated in a wide spectrum of diseases, most critically cancer, where they control processes such as invasion, metastasis, and cell proliferation[3]. Therapeutically, they are challenging targets due to their involvement in essential cellular processes and the high degree of sequence homology between family members. However, there is significant research interest in targeting downstream effectors (such as Rho-associated kinases, ROCK), or interfering with upstream regulators as therapeutic strategies[4][3].

Other names

Rho family GTPaseRho proteinsRho GTPaseRho/Rac/Cdc42 proteins

Inhibition of GTP loading (preventing activation), disruption of effector binding, inhibition of downstream kinases (e.g., ROCK inhibition), interference at regulatory proteins (GEF, GAP, GDI modulation)