Wiskott-Aldrich syndrome protein (WASp)

Wiskott-Aldrich syndrome protein (WASp) is an effector protein selectively expressed in hematopoietic cells and is essential for the transduction of signals from cell surface receptors to the actin cytoskeleton[1][3][7][8]. Its modular structure (containing WH1/EVH1, basic, GTPase-binding (GBD), proline-rich (PRD), and VCA domains) enables interaction with many protein partners and regulatory inputs, including the small GTPase CDC42 and the ARP2/3 complex, leading to branched actin filament formation. In immune cells, WASp is critical for immunological synapse formation, cell activation and migration, and maintenance of proper immune responses and tissue homeostasis. Deficiency or dysfunction in WASp results in severe immunodeficiency, autoimmunity, and hematologic abnormalities, making it a key target in genetic, immunologic, and therapeutic research[1][2][3][4][5][7][8]. Small molecules such as wiskostatin demonstrate the potential for pharmaceutical modulation of its activity by stabilizing the protein in its inactive state[6].

Other names

WASpWAS proteinWiskott-Aldrich syndrome protein family

Allosteric inhibition by stabilization of the autoinhibited conformation. Modulation of actin nucleation by altering WASp recruitment and activation.