Identification of cDNAs encoding pterocarpan reductase involved in isoflavan phytoalexin biosynthesis inLotus japonicusby EST mining
- 18 September 2006
- journal article
- Published by Wiley in FEBS Letters
- Vol. 580 (24), 5666-5670
- https://doi.org/10.1016/j.febslet.2006.09.016
Abstract
Isoflavans and pterocarpans are the major biosynthetically connected phytoalexins in legumes. A search of the expressed sequence tag library of a model legume Lotus japonicus, which produces an (−)-isoflavan, for homologs of phenylcoumaran benzylic ether reductase catalyzing the reductive cleavage of dihydrofurans, yielded seven full-length cDNAs, and the encoded proteins were analyzed in vitro. Four of them cleaved the dihydrofuran of a pterocarpan medicarpin to yield an isoflavan (−)-vestitol and were designated pterocarpan reductase (PTR). Two PTRs displayed enantiospecificity to (−)-medicarpin, representing genuine L. japonicus PTRs, while the other two lacked enantiospecificity and were presumed to be evolutionarily primitive typesKeywords
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