Prevents transcriptional repression and induction of cell death by ENO1. May play a role in vesicular transport from endoplasmic reticulum to Golgi. Interacts with PITX1, SF1, and TRAPPC3 (By similarity). Can homodimerize (By similarity). Part of the multisubunit TRAPP (transport protein particle) complex. Interacts with ENO1 and TRAPPC2L. Localized in perinuclear granular structures. Expressed in brain, heart, kidney, liver, lung, pancreas, placenta, skeletal muscle, fetal cartilage, fibroblasts, placenta and lymphocytes. The gene encoding this protein appears to have arisen by retrotransposition of a cDNA from the X-linked locus TRAPPC2. The site of integration of this retrotransposed cDNA appears to lie within an intron of the ZNF547 gene, which provides a promoter and non-coding 5' exon. TRAPPC2 and this protein are indistinguishable at protein level, and both proteins have been identified and functionally characterized. Belongs to the TRAPP small subunits family. Sedlin subfamily.