B-15 天然由来のラファヌサニンの構造と機能

概要

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Light-induced growth inhibitors were isolated from light-grown radish seedlings, and named raphanusanins. Recently natural raphanusanins were determined to be isomers of 3-(methylthio)methylene-2-pyrrolidinethione. The raphanusanins are produced from 4-methylthio-3-butenyl glucosinolate(MTBG)via 4-methylthio-3-butenyl isothiocyanate(MTBI). The contents of raphanusanins and MTBI in hypocotyls increased by uni-and bilateral illumination, whereas the content of MTBG decreased. The biological activities of raphanusanins and their precursors are studied by means of the radish hypocotyl growth test and the cress root growth test.The raphanusanins had strong inhibitory activities in both bioassays, whereas MTBI shwed inhibitory activity at concentration greater than 3mM. MTBG showd no inhibitory activity. These data suggest that MTBI is released from MTBG by light-promoted thioglucosidase and spontaneously converted into bioactive raphanusanins.
植物化学調節学会の論文
1998-10-01