Soluble N-ethylmaleimide-sensitive-factor-attachment proteins (SNAPs) and act as adapters between N-ethylmaleimide-sensitive factor (NSF), a hexameric ATPase, and SNARE proteins (SNAP receptors). SNAPs bind SNARE complexes and recruit NSF, simulating ATP hydrolysis by NSF, leading to conformational changes and dissociation of the SNARE complex. SNAPs can be divided into three subfamilies: the closely related α, β forms; and the γ form, which is much less well characterised and may differ significantly in its function. All three forms are present in mammals. D.mel lacks the β form. (Adapted from FBrf0141270).