May play a role in immune regulation through regulation of the macrophage function (By similarity). May also play a role in trafficking of proteins via its interaction with unc119 family cargo adapters (By similarity). May play a role in ciliary membrane localization (By similarity). Interacts with unc119 family proteins; interaction preferentially takes place when unc119 proteins are unliganded with myristoylated proteins. Belongs to the UNC119-binding protein family.