Hexaene derivatives of nystatin produced as a result of an induced rearrangement within the nysC polyketide synthase gene in S. noursei ATCC 11455 |
| |
Authors: | Brautaset Trygve Bruheim Per Sletta Håvard Hagen Lars Ellingsen Trond E Strøm Arne R Valla Svein Zotchev Sergey B |
| |
Affiliation: | Department of Biotechnology, Norwegian University of Science and Technology, N-7491 Trondheim, Norway. |
| |
Abstract: | Genetic manipulation of the polyketide synthase (PKS) gene nysC involved in the biosynthesis of the tetraene antifungal antibiotic nystatin yielded a recombinant strain producing hexaene nystatin derivatives. Analysis of one such compound, S48HX, by LC-MS/MS suggested that it comprises a 36-membered macrolactone ring completely decorated by the post-PKS modification enzymes. Further characterization by bioassay has shown that S48HX exhibits antifungal activity. Genetic analysis of the hexaene-producing mutant revealed an in-frame deletion within the nysC gene via recombination between two homologous ketoreductase domain-encoding sequences. Apparently, this event resulted in the elimination of one complete module from NysC PKS, subsequently leading to the production of the nystatin derivative with a contracted macrolactone ring. These results represent the first example of manipulation of a PKS gene for the biosynthesis of a polyene antibiotic. |
| |
Keywords: | |
本文献已被 ScienceDirect PubMed 等数据库收录! |
|