title: Improved production of A40926 by Nonomuraea sp. through deletion of a pathway-specific acetyltransferase.
abstract: Nonomuraea strain ATCC 39727 produces the glycopeptide A40926, used for manufacturing dalbavancin, currently in advanced clinical trials. From the gene cluster involved in A40926 biosynthesis, a strain deleted in dbv23 was constructed. This mutant can produce only the glycopeptides lacking the O-linked acetyl residue at position 6 of the mannose moiety, while, under identical fermentation conditions, the wild-type strain produces mostly glycopeptides carrying an acetylated mannose. Furthermore, the total amount of glycopeptides produced by the mutant strain was found to be approximately twice that of the wild type. The reduced level of glycopeptides observed in the wild-type strain may be due to an inhibitory effect exerted by the acetylated compound on the biosynthesis of A40926. Indeed, spiking production cultures with > or =1 microg/ml of the acetylated glycopeptide inhibited A40926 production in the mutant strain.
authors.affiliation: Vicuron Pharmaceuticals, 20140 Gerenzano, Italy. margherita.sosio@ktedogen.com
authors.forename: Margherita
authors.initials: M
authors.lastname: Sosio
authors.forename: Augusto
authors.initials: A
authors.lastname: Canavesi
authors.forename: Sofia
authors.initials: S
authors.lastname: Stinchi
authors.forename: Stefano
authors.initials: S
authors.lastname: Donadio
mesh_terms: D000123:Acetyltransferases / Q000235:genetics*; D000192:Actinomycetales / Q000201:enzymology / Q000235:genetics* / Q000378:metabolism*; D000900:Anti-Bacterial Agents / Q000096:biosynthesis*; D001426:Bacterial Proteins / Q000235:genetics*; D002851:Chromatography, High Pressure Liquid; D015971:Gene Expression Regulation, Enzymologic; D015394:Molecular Structure; D005810:Multigene Family; D017384:Sequence Deletion; D017334:Teicoplanin / Q000031:analogs & derivatives* / Q000096:biosynthesis
chemical_list: C054981:A 40926; D000900:Anti-Bacterial Agents; D001426:Bacterial Proteins; D017334:Teicoplanin; D000123:Acetyltransferases