May play a role in immune regulation through regulation of the macrophage function (By similarity). Involved in the recruitment of macrophages in response to injury (PubMed:30659109). 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 (PubMed:22085962). Regulates the macrophage function, by enhancing the resolution of inflammation and wound repair functions mediated by M2 macrophages. The regulation of macrophage function is, due at least in part, to the role of C5orf30 in regulating ability to inhibit glycolysis. Probably plays alaso a role in trafficking of proteins via its interaction with UNC119 and UNC119B cargo adapters: may help the release of UNC119 and UNC119B cargo or the recycling of UNC119 and UNC119B. May play a role in ciliary membrane localization via its interaction with UNC119B and protein transport into photoreceptor cells. Interacts with unc119 family proteins; interaction preferentially takes place when unc119 proteins are unliganded with myristoylated proteins. Morpholino knockdown increases the recruitment of macrophages in response to injury. Belongs to the UNC119-binding protein family.