Anchors the catalytic subunits of asymmetric AChE to the synaptic basal lamina. The asymmetric form of AChE is a disulfide-bonded oligomer composed of a collagenic subunit (Q) and a variable number of asymmetric (T) catalytic subunits. The N-terminal of the collagenic subunit (Q) associates with the C-terminal of the catalytic subunit (T). Expressed in electric organs but not in muscle. The proline-rich attachment domain (PRAD) binds the AChE catalytic subunits. Belongs to the COLQ family.