Involved in cellular calcium homeostasis regulation (By similarity). May participate in differentiation and apoptosis of keratinocytes. Overexpression induces apoptosis (By similarity). Interacts with PTPN2. Interacts with microtubules. Interacts with VAPB. Interacts (FFAT motif) with MOSPD2 (via MSP domain). In interphase localizes in the cytoplasm, and during mitosis localizes to the spindle microtubules and spindle poles. The transmembrane region is required for mitochondrial localization. The FFAT motif is required for interaction with MOSPD2. Belongs to the RMDN family. Extended N-terminus. Contaminating sequence. Potential poly-A sequence. Truncated N-terminus.