Decoyinine (Decynylene), a selective inhibitor of GMP synthase, is a novel potential microbial insecticide, a secondary metabolite produced by Streptomyces hygroscopicus.Decoyinine induces resistance in rice to the small brown ladybug Laodelphax striatellus.

Decoyinine exerts a stimulatory effect on oaamylase synthesis only in the strain in which the catabolite repression component of a-amylase regulation has been rendered inoperable by the gra-10 mutation. Decoyinine is an analog of adenosine which causes a decrease in intracellular GTP levels by inhibition of GMP synthetase. The apparent stimnulation of a-amylase activity in WLN-11 by Decoyinine is not an artifactual effect exerted at the level of enzyme activity itself. At the concentration used in the experiments (1.07 mM), Decoyinine has no effect in vitro on B. subtilis WLN-11 oaamylase activity. At the same concentration, GMP exerts a slight inhibitory effect on aamylase activity.[2]

Decoyinine (Angustmycin A) treatment hinders tumor growth in xenograft mouse model. Like GMPS activity, the effect of Decoyinine does not appear to be subtype specific as it impairs growth of xenografts from cells harboring NRASQ61R (SK-Mel-103) or BRAFV600E (SK-Mel-28) mutations.[1]