Isolation and characterization of linear plasmids from lankacidin-producing Streptomyces species.
Streptomyces rochei 7434AN4, a producer of lankacidin and lankamycin contains three large linear plasmids, pSLA2-L (200 kb), M (100 kb), and S (17 kb). Studies on the mutants of 7434AN4 having a different plasmid profile showed a parallel relationship between the presence of pSLA2-L and the production of both lankacidin and lankamycin. When pSLA2-L was transferred by protoplast fusion to S. rochei 2-39, a non-antibiotic-producing mutant of 7434AN4 which contained no detectable plasmid, the fusants gained the capacity to produce both antibiotics. From the physical maps of pSLA2-L and pSLA2-L1, a deletion plasmid (160 kb) of pSLA2-L, the latter plasmid was determined to contain a symmetrical linear repeat composed of the right 80-kb part of pSLA2-L. Four other lankacidin-producing Streptomyces strains were also found to have distinctive large linear plasmids which hybridized with the pSLA2-L probe. These results support the involvement of pSLA2-L in the production of lankacidin and lankamycin in S. rochei 7434AN4.
Kinashi
H
H
Department of Fermentation Technology, Faculty of Engineering, Hiroshima University, Japan.
Mori
E
E
Hatani
A
A
Nimi
O
O
D000900:Anti-Bacterial Agents / Q000096:biosynthesis*; D000903:Antibiotics, Antineoplastic / Q000096:biosynthesis*; D004587:Electrophoresis, Agar Gel; D004591:Electrophoresis, Polyacrylamide Gel; D018942:Macrolides; D009154:Mutation; D010957:Plasmids / Q000737:chemistry / Q000302:isolation & purification*; D011523:Protoplasts / Q000378:metabolism; D015183:Restriction Mapping; D013302:Streptomyces / Q000235:genetics* / Q000378:metabolism
D000900:Anti-Bacterial Agents; D000903:Antibiotics, Antineoplastic; D018942:Macrolides; C008250:lankacidins