title: Comparative analysis of transcriptional activities of heterologous promoters in the rare actinomycete Actinoplanes friuliensis.
abstract: Manipulation of secondary metabolite production in the rare actinomycete Actinoplanes friuliensis, the producer of the lipopeptide antibiotic friulimicin, is hampered by the lack of sophisticated genetic tools. Since no expression vectors have been developed from endogenous Actinoplanes plasmids and expression signals, engineering of antibiotic biosynthesis relies on the use of vector systems derived from Streptomyces. While PhiC31 derived vectors were shown to integrate efficiently into the chromosome of Actinoplanes, information on promoter activity is missing. The manuscript describes the investigation of several different promoter systems which are widely used in Streptomyces in A. friuliensis by promoter probe experiments using eGFP as a reporter. These experiments indicated that promoter strength in A. friuliensis did not correlate to activity in Streptomyces lividans. The ermE* promoter regarded as one of the strongest promoter in Streptomyces has only low activity in A. friuliensis. In contrast, the promoter of the apramycin resistance gene aac(3)IV, originating from the Gram-negative Escherichia coli had the highest activity. By real-time RT-PCR experiments the transcription activity of ermE* promoter in comparison to a native promoter of the friulimicin biosynthetic gene cluster was analysed. This confirmed the results of the promoter probe experiments that indicated quite weak promoter activity of P-ermE* in Actinoplanes.
authors.affiliation: University of Applied Sciences Esslingen, Kanalstrasse 33, 73728 Esslingen, Germany.
authors.forename: Nina
authors.initials: N
authors.lastname: Wagner
authors.forename: Corina
authors.initials: C
authors.lastname: Osswald
authors.forename: Richard
authors.initials: R
authors.lastname: Biener
authors.forename: Dirk
authors.initials: D
authors.lastname: Schwartz
mesh_terms: D049452:Green Fluorescent Proteins / Q000096:biosynthesis / Q000235:genetics; D008848:Micromonosporaceae / Q000235:genetics* / Q000378:metabolism; D011401:Promoter Regions, Genetic; D015202:Protein Engineering / Q000379:methods; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction / Q000379:methods; D048170:Streptomyces lividans / Q000235:genetics; D014158:Transcription, Genetic
chemical_list: D012333:RNA, Messenger; C485184:enhanced green fluorescent protein; D049452:Green Fluorescent Proteins