UDP-glucuronic acid transporter that modulates the polysaccharide composition of seed mucilage. Transports UDP-glucuronic acid (UDP-GlcA) and UDP-galacturonic acid (UDP-GalA) in vitro. Ubiquitous. Expressed during seed development at the mucilage production stages. Changes in cell wall monosaccharide composition with a strong reduction of galacturonic acid (GalA), rhamnose and xylose content in the sead coat mucilage composition. Belongs to the TPT transporter family. TPT (TC 2.A.7.9) subfamily.