MUM4 — Zea mays

Summary

ZM00001EB284390 (MUM4, also known as ZmRHM1, ZmRHM2, ZmRHM3, and ZmROL1) on maize chromosome 6 encodes a protein with UDP-L-rhamnose synthase, UDP-glucose 4,6-dehydratase, UDP-4-keto-6-deoxy-glucose-3,5-epimerase, and UDP-4-keto-rhamnose-4-keto-reductase activities (EC 4.2.1.76). The gene is associated with UDP-rhamnose and UDP-L-arabinose biosynthesis, mucilage and rhamnogalacturonan I production, cell wall organization, flavonol biosynthesis, auxin export, and seed coat development. It has been linked to seed mucilage synthesis and composition, root hair development, cell wall rhamnose content, seed oil content, and plant growth. The encoded protein localizes to the Golgi membrane, cytosol, nucleus, mitochondria, plasmodesmata, and stress granules. Studies of related genes in other species connect this family to seed coat morphology, flavonol glycosylation, helical petal twisting, and grain texture.