Enhances VCP methylation catalyzed by VCPKMT (By similarity). Tethering protein that sequesters GLUT4-containing vesicles in the cytoplasm in the absence of insulin. Modulates the amount of GLUT4 that is available at the cell surface. Interacts with VCP. Interacts with VCPKMT (By similarity). Interacts with GLUT4. Ubiquitous.