1.14.11.35 Crystal structure of the non-heme iron dioxygenase PtlH in pentalenolactone biosynthesis Streptomyces avermitilis 1.14.11.35 Pentalenolactone biosynthesis. Molecular cloning and assignment of biochemical function to PtlH, a non-heme iron dioxygenase of Streptomyces avermitilis Streptomyces avermitilis