FIGURE 1.
Neopentalenolactone and pentalenolactone biosynthetic gene clusters. (A) S. avermitilis ptl gene cluster for neopentalenolactone biosynthesis. (B) S. arenae pnt gene cluster for pentalenolactone biosynthesis. (C) S. exfoliatus pen gene cluster for pentalenolactone biosynthesis. (D) Proposed S. bingchenggensis pentalenolactone biosynthetic gene cluster.