Golgi auto-antigen; probably involved in maintaining Golgi structure. Homodimer. Interacts with GOLGA7. Isoform 1 interacts with GOPC while isoform 3 does not. Expressed in all tissues tested. Expressed in liver, testis, lung, heart, salivary gland and kidney. Extended rod-like protein with coiled-coil domains. Cleaved by caspases in apoptotic cells. May be due to an intron retention. Contaminating sequence. Potential poly-A sequence.