Enables acetylcholine receptor binding activity. Acts upstream of or within cholinergic synaptic transmission and positive regulation of cytosolic calcium ion concentration. Predicted to be located in endoplasmic reticulum. Predicted to be integral component of membrane. Predicted to be active in intracellular membrane-bounded organelle; neuron projection; and neuronal cell body. Orthologous to human RIC3 (RIC3 acetylcholine receptor chaperone). [provided by Alliance of Genome Resources, Apr 2022]