title: 'Streptomyces nanchangensis', a producer of the insecticidal polyether antibiotic nanchangmycin and the antiparasitic macrolide meilingmycin, contains multiple polyketide gene clusters.
abstract: Several independent gene clusters containing varying lengths of type I polyketide synthase genes were isolated from 'Streptomyces nanchangensis' NS3226, a producer of nanchangmycin and meilingmycin. The former is a polyether compound similar to dianemycin and the latter is a macrolide compound similar to milbemycin, which shares the same macrolide ring as avermectin but has different side groups. Clusters A-H spanned about 133, 132, 104, 174, 122, 54, 37 and 59 kb, respectively. Two systems were developed for functional analysis of the gene clusters by gene disruption or replacement. (1) Streptomyces phage phiC31 and its derived vectors can infect and lysogenize this strain. (2) pSET152, an Escherichia coli plasmid with phiC31 attP site, and pHZ1358, a Streptomyces-Escherichia coli shuttle cosmid vector, both carrying oriT from RP4, can be mobilized from E. coli into NS3226 by conjugation. pHZ1358 was shown to be generally useful for generating mutant strains by gene disruption and replacement in NS3226 as well as in several other Streptomyces strains. A region in cluster A (approximately 133 kb) seemed to be involved in nanchangmycin production because replacement of several DNA fragments in this region by an apramycin resistance gene [aac3(IV)] gave rise to nanchangmycin non-producing mutants.
authors.affiliation: Jiangxi Agricultural University, Nanchang 330045, China3.|Huazhong Agricultural University, Wuhan 430070, China2.|Bio-X Life Science Research Center, Shanghai Jiaotong University, Shanghai 200030, China1.
authors.forename: Yuhui
authors.initials: Y
authors.lastname: Sun
authors.affiliation: John Innes Centre, Colney, Norwich NR4 7UH, UK4.|Huazhong Agricultural University, Wuhan 430070, China2.|Bio-X Life Science Research Center, Shanghai Jiaotong University, Shanghai 200030, China1.
authors.forename: Xiufen
authors.initials: X
authors.lastname: Zhou
authors.affiliation: Huazhong Agricultural University, Wuhan 430070, China2.|Bio-X Life Science Research Center, Shanghai Jiaotong University, Shanghai 200030, China1.
authors.forename: Jun
authors.initials: J
authors.lastname: Liu
authors.affiliation: Huazhong Agricultural University, Wuhan 430070, China2.|Bio-X Life Science Research Center, Shanghai Jiaotong University, Shanghai 200030, China1.
authors.forename: Kai
authors.initials: K
authors.lastname: Bao
authors.affiliation: Huazhong Agricultural University, Wuhan 430070, China2.
authors.forename: Guiming
authors.initials: G
authors.lastname: Zhang
authors.affiliation: Jiangxi Agricultural University, Nanchang 330045, China3.
authors.forename: Guoquan
authors.initials: G
authors.lastname: Tu
authors.affiliation: John Innes Centre, Colney, Norwich NR4 7UH, UK4.
authors.forename: Tobias
authors.initials: T
authors.lastname: Kieser
authors.affiliation: John Innes Centre, Colney, Norwich NR4 7UH, UK4.|Huazhong Agricultural University, Wuhan 430070, China2.|Bio-X Life Science Research Center, Shanghai Jiaotong University, Shanghai 200030, China1.
authors.forename: Zixin
authors.initials: Z
authors.lastname: Deng
mesh_terms: D000900:Anti-Bacterial Agents / Q000096:biosynthesis* / Q000378:metabolism*; D000977:Antiparasitic Agents / Q000378:metabolism; D002874:Chromosome Mapping; D003001:Cloning, Molecular; D003360:Cosmids / Q000235:genetics; D004926:Escherichia coli / Q000235:genetics; D004987:Ethers / Q000378:metabolism*; D005798:Genes, Bacterial; D007306:Insecticides / Q000378:metabolism; D018942:Macrolides; D015335:Molecular Probes; D009097:Multienzyme Complexes / Q000235:genetics; D005810:Multigene Family; D010957:Plasmids / Q000235:genetics; D016930:Saccharopolyspora / Q000201:enzymology / Q000235:genetics; D013141:Spiro Compounds / Q000378:metabolism*; D013302:Streptomyces / Q000235:genetics* / Q000378:metabolism*
chemical_list: D000900:Anti-Bacterial Agents; D000977:Antiparasitic Agents; D004987:Ethers; D007306:Insecticides; D018942:Macrolides; D015335:Molecular Probes; D009097:Multienzyme Complexes; D013141:Spiro Compounds; C452420:meilingmycin; C452419:nanchangmycin