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Probing carotenoid biosynthesis in developing seed coats of Bixa orellana (Bixaceae) through expressed sequence tag analysis

Bixin is a commercially important diapocarotenoid derived from the seed coats of the tropical shrub Bixa orellana . Based on available chemical data and by analogy to abscisic acid biosynthesis, a biosynthetic pathway for bixin starting from lycopene is proposed. This putative pathway was investigated through expressed sequence tag (EST) analysis using a subtracted cDNA library. This analysis identified ESTs corresponding to most of the enzymes of the carotenoid biosynthesis pathway including the 1-deoxy- d -xylulose 5-phosphate pathway of plastids. ESTs corresponding to a number of genes encoding dioxygenases, aldehyde dehydrogenases and carboxyl methyltransferases were also identified. These represent candidate enzymes for the last stage of the bixin biosynthetic pathway. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Plant Science Elsevier
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