USP — Phaseolus vulgaris

Summary

PvUSP (PHAVU_009G130500) in French bean (Phaseolus vulgaris) on chromosome 9 encodes a UDP-sugar pyrophosphorylase, a member of the UDPGP family with nucleotide-diphosphosugar transferase activity. The enzyme exhibits multiple uridylyltransferase activities, including UTP:xylose-1-phosphate, UTP:arabinose-1-phosphate, UTP:galactose-1-phosphate, UTP:glucose-1-phosphate, and glucuronate-1-phosphate uridylyltransferase activities, as well as UDP-monosaccharide diphosphorylase and UDP-N-acetylglucosamine diphosphorylase activities. It is associated with nucleotide-sugar anabolism, UDP-glucuronate, UDP-galactose, UDP-glucose, and UDP-L-arabinose metabolism, and UDP-GlcNAc biosynthesis. The gene is linked to embryogenesis, microsporogenesis, pollen development, and NO storage, with localization to the pollen tube and cytosol. It is also associated with circadian rhythm. Studies of related genes in other species link the family to protein content, seed maturation, homozygous lethality, and complete male sterility.