Identification of phyllostine as an intermediate of the patulin pathway in Penicillium urticae.
A patulin negative mutant (J1) of Penicillium urticae (NRRL 2159A) was found to accumulate large quantities (greater than 128 mg/L culture) of a reactive, photosensitive compound, which was isolated and identified as (-)-phyllostine (5,6-epoxygentisylquinone). This epoxyquinone possessed an antibiotic activity against Bacillus subtilis which was approximately 80% of that exhibited by patulin. In separate in vivo feeding experiments, [2-14C]acetate and [G-3H]gentisaldehyde were readily incorporated into phyllostine by mutant J1 and [14C]phyllostine was incorporated into patulin by the parent strain (NRRL 2159A). When fed to a washed-cell suspension of a second patulin negative mutant (J2) which produced gentisaldehyde but not phyllostine, unlabeled phyllostine was efficiently converted to patulin in yields of 33, 56, and 92% after 30 min, 1 and 5 h, respectively. The role of phyllostine as an intermediate of a new post-gentisaldehyde portion of the patulin biosynthetic pathway is discussed.
D000900:Anti-Bacterial Agents; D001412:Bacillus subtilis / Q000187:drug effects; D005841:Gentisates / Q000378:metabolism* / Q000494:pharmacology; D008954:Models, Biological; D009154:Mutation; D010365:Patulin / Q000096:biosynthesis* / Q000494:pharmacology; D010407:Penicillium / Q000378:metabolism*; D011714:Pyrans / Q000096:biosynthesis*; D011809:Quinones / Q000378:metabolism*; D013045:Species Specificity
D000900:Anti-Bacterial Agents; D005841:Gentisates; D011714:Pyrans; D011809:Quinones; C017633:phyllostine; D010365:Patulin