Anchors the catalytic subunits of asymmetric AChE to the synaptic basal lamina. Homotrimer. Component of the asymmetric form of AChE, a disulfide-bonded oligomer composed of the collagenic subunits (Q) and a variable number of asymmetric catalytic subunits (T). The N-terminal of a collagenic subunit (Q) associates with the C-terminal of a catalytic subunit (T) (By similarity). The proline-rich attachment domain (PRAD) binds the AChE catalytic subunits. The triple-helical tail is stabilized by disulfide bonds at each end. Belongs to the COLQ family.