AAT — Beta vulgaris subsp. vulgaris

Summary

BvAAT (BVRB_4G079300) on sugar beet chromosome 4 encodes a pyridoxal phosphate-dependent aminotransferase with multiple activities, including LL-diaminopimelate, nicotianamine, and prephenate transaminase functions, as well as 1-aminocyclopropane-1-carboxylate synthase activity. The gene is associated with amino acid metabolism, particularly L-phenylalanine biosynthesis, tyrosine breakdown, and ethylene production. It has been linked to systemic acquired resistance via salicylic acid signaling, fruit ripening, and embryo development. The product localizes to the amyloplast membrane and chloroplast stroma. Associations with aromatic amino acid biosynthesis and parthenocarpic fruit development have been noted. Studies of related genes in other species connect the family to carotenoid and chlorophyll content, root morphology, and nitrogen metabolism.