The zinc metalloprotease ZMPSTE24 binds a distinct topological isoform of the tail-anchored protein IFITM3
It is hypothesized that the ZMPSTE24E336A trap mutant reveals a normally transient isoform of IFITM3 whose transmembrane span is inverted and that ZMPSTE24 is involved in the quality control of IFITM3 topology, either inverting, correcting or assisting in removal of aberrant IFITM3 molecules.