1.A.64.5.4
CKLF-like MARVEL transmembrane domain-containing protein 8 of 343 aas and 4 TMSs, CMTM8. A short splice variant, CMTM8-v2, retains the ability to induce apoptosis via caspase-dependent and -independent pathways to inhibit cell growth and colony formation. CMTM8 and CMTM8-v2 display different expression profiles and distinct subcellular localization patterns, while operating via different mechanisms to induce apoptosis. CMTM8-v2 does not affect EGFR internalization, implying that the MARVEL domain and/or the cytosolic YXXPhi motifs are necessary for CMTM8 to accelerate ligand-induced EGFR internalization (Li et al. 2007).