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Identification of Vitis vinifera (-)-a-terpineol synthase by in silico screening of full-length cDNA ESTs and functional characterization of recombinant terpene synthase

, : Identification of Vitis vinifera (-)-a-terpineol synthase by in silico screening of full-length cDNA ESTs and functional characterization of recombinant terpene synthase. Phytochemistry 65(9): 1223-1229

The flavour and aroma of certain Vitis vinifera grape varieties is dominated by volatile terpenes and small volatile aldehydes. Monoterpenes contribute to the final grape and wine aroma and flavour in form of free volatiles and as glycoside conjugates of monoterpene alcohols. Typical monoterpenol components of the cultivar Gewurztraminer and other aroma-rich grape varieties are linalool, geraniol, nerol, citronellol, and a-terpineol. In a functional genomics effort to identify genes for the formation of monoterpene alcohols in V. vinifera, a database of full-length cDNA sequences was screened in silico and yielded two clones for putative monoterpene synthases. The gene products were functionally characterized by expression in Escherichia coli, in vitro enzyme assay and gas chromatography-mass spectrometry (GC-MS) product identification as multi-product (-)-a-terpineol synthases.


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