Regulation of ascorbic acid synthesis in plants.
Beijing, China. In Plant Signal Behav, 2013
GDP-mannose pyrophosphorylase (VTC1) is the initial AsA biosynthetic enzyme in L-galactose pathway, we previously showed that Arabidopsis ERF98 transcriptionally activates gene expression of VTC1 to improve AsA content and respond salt stress; recent discovery of the interaction between photomorphogenic factor COP9 signalosome (CSN) subunit CSN5B and VTC1 indicates that CSN5B promotes VTC1 degradation in the dark, which keeps the change of AsA content from day to night.
Investigation of ascorbate metabolism during inducement of storage disorders in pear.
Lleida, Spain. In Physiol Plant, 2013
Quantitative polymerase chain reaction indicated that all cultivars responded to CA storage by increasing transcripts for APXs, and surprisingly the pre-l-galactose pathway gene GDP-mannose pyrophosphorylase, of which the product GDP mannose, is utilized either for cell wall polysaccharides, protein N-glycosylation or ascorbate production.
L-ascorbic acid biosynthesis.
Exeter, United Kingdom. In Vitam Horm, 2000
GDP-mannose pyrophosphorylase and L-galactono-1,4-lactone dehydrogenase have been cloned.