USP — Pisum sativum

Summary

PsUSP (PSAT5G084360) on garden pea chromosome 5LG3 encodes a UDP-sugar pyrophosphorylase with UTP:xylose-1-phosphate uridylyltransferase activity and broader UDP-monosaccharide diphosphorylase activity (EC 2.7.7.64). The enzyme is associated with the biosynthesis of UDP-glucuronate, UDP-galactose, UDP-glucose, UDP-L-arabinose, and UDP-N-acetylglucosamine, as well as with nucleotide-sugar anabolism and ecdysteroid anabolism. It is linked to embryogenesis, microsporogenesis, lateral root formation, pollen development, and nitric oxide storage. The protein localises to the cytosol and pollen tube. Annotated associations also connect PsUSP to circadian rhythm. Studies of related genes in other species link the UDP-sugar pyrophosphorylase family to protein content and seed maturation, while homozygous lethal and complete male sterility phenotypes have been observed in those relatives.