GGP — Solanum lycopersicum

Summary

SOLYC06G073320.3 (GGP, also known as VTC2 and VTC5) on tomato chromosome 6 encodes a protein with a GDPGP domain and exhibits GDP-galactose:myoinositol-1-phosphate guanylyltransferase activity, GDP-galactose:glucose-1-phosphate guanylyltransferase activity, GDP-galactose:mannose-1-phosphate guanylyltransferase activity, GDP:mannose-1-phosphate guanylyltransferase activity, GDP-D-glucose phosphorylase activity, and quercetin 4'-O-glucosyltransferase activity. The gene is associated with vitamin C content in tomato, as well as with carotenoid and sugar content. It has been linked to fruit ripening, fruit weight, fruit firmness, fruit size and shape, plant height, stem diameter, net photosynthetic rate, respiration rate, starch and protein content, and organ identity. Associations also include chilling, salt, drought and oxidative stress tolerance, pathogen and aphid resistance, pollen fertility, anthocyanin accumulation, leaf senescence, root length, and photochemical and non-photochemical quenching. The encoded protein is localised to the nucleus and is associated with ascorbate metabolism, the xanthophyll cycle, hormone metabolism, carotenoid metabolism, iron transport, and energy homeostasis.