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Plant Biotechnology 2019

De novo transcriptome analysis of needles of Thujopsis dolabrata var. hondae.

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Krækjan er vistuð á klemmuspjaldið
Shiro Suzuki
Hideyuki Suzuki
Koji Tanaka
Masaomi Yamamura
Daisuke Shibata
Toshiaki Umezawa

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Útdráttur

Podophyllotoxin is a starting material of the semisynthetic anticancer medicines etoposide, teniposide, and etopophos. The major plant source of podophyllotoxin is rhizomes of Podophyllum hexandrum, which is a Himalayan endangered species; therefore, alternative sources of podophyllotoxin or bioproduction systems have been pursued to avoid exploiting this limited natural resource. In this paper, we report de novo transcriptome analysis of Thujopsis dolablata var. hondae, which accumulates the podophyllotoxin derivatives (deoxypodophyllotoxin and β-peltatin A methyl ether) in its needles. We analyzed transcriptomes of the T. dolablata var. hondae young needles to obtain the sequences that putatively encode O-methyltransferases, cytochrome P450s, and a 2-oxoglutarate dependent dioxygenase because these protein families are responsible for podophyllotoxin-related compound formation in P. hexandrum. The resulting transcriptomes contained considerable numbers of coding sequences classified into the three protein families. Our results are a genetic basis for identifying genes involved in the biosynthesis of podophyllotoxin and related compounds and also for future metabolic engineering of podophyllotoxin in heterologous hosts.

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