Sequence alignment of human ACBD4 and ACBD5 and VAPB interaction of ACBD4 in vitro.A, alignment of human ACBD4 and ACBD5 with regions of interest highlighted. TMD: transmembrane domain, Tail: region following the TMD inside the organelle lumen. B, in-vitro binding of purified ACBD4 and VAPB. Recombinant versions of both proteins, lacking the TMD, were expressed in E.coli and purified. ACBD4 (10 μM) was bound onto Ni-NTA beads and incubated with indicated concentrations of VAPBmsp. Bound fractions were analysed by immunoblotting with His and VAPB antibodies.