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Recombination and Screening of Putative Glucosyltransferase Clone 4 in Pichia pastoris

2012
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Lecture / Presentation Description

Flavonoids are a group of plant secondary metabolites that are vital to the cell systems of plants. The intake of these chemicals is advantageous to animals for their antioxidant properties that affect the function of immune and inflammatory cells. The bitter taste of grapefruit (Citrus paradise) and other citrus species is caused by the accumulation of glycosylated flavonoids. Glucosyltransferases (GTs) are enzymes that add glucose moieties to a carbon or hydroxyl group of natural products. The function of a putative secondary product GT clone was tested. In previous research, putative GT 4 was cloned into a pCD1 modified pET expression system, heterologously expressed in E.coli, and screened for activity with only a few substrates, and little GT activity was found. Issues of protein localized to inclusion bodies in bacteria are being addressed. PGT 4 is being heterologously expressed in yeast (Pichia pastoris) to allow for protein production and analysis. PGT 4 will be screened for GT activity with different flavonoid subclass representatives and simple phenolics. PGT 4’s significant impact on the biochemical regulation of Citrus paradise will be elucidated with its characterization and determination of PGT 4’s structure and function.

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