Fig. 5

Proposed biosynthesis pathway of PM100117 and PM100118 naphthoquinone moiety. LD loading domain, M1 extension module. Polyketide synthase domains are as follows KS ketosynthase, AT acyltransferase, KR ketoreductase, DH dehydratase, ACP acyl-carrier-protein, CAL CoA ligase, KSIII 3-oxoacyl-ACP synthase III