Capping protein (actin filament) muscle Z-line, alpha 1

F-actin-capping protein subunit alpha-1 is a is_associated_with::protein that in humans is encoded by the CAPZA1 is_associated_with::gene.

CAPZA1 is a member of the is_associated_with::F-actin capping protein alpha subunit family. This gene encodes the alpha subunit of the barbed-end actin binding protein.

Function
The protein regulates growth of the is_associated_with::actin filament by capping the barbed end (plus-end) of growing actin filaments, preventing any further assembly from occurring. This protein can be bound to the lipid PIP2 preventing it from binding to actin filaments.