Molecular chaperone which facilitates proper subunit assembly andsurface trafficking of alpha-7 (CHRNA7) and alpha-8 (CHRNA8) nicotinic acetylcholine receptors (By similarity). May also promote functional expression of homomeric serotoninergic 5-HT3 receptors, and of heteromeric acetylcholine receptors (By similarity). Belongs to the ric-3 family.