2.3.1.240 expression in Escherichia coli 730470 2.3.1.240 expression in Streptomyces venezuelae 736312 2.3.1.240 expression of functional polyketide synthase modules in Escherichia coli 729876 2.3.1.240 overexpression of pikromycin modules PikAIII and PIkAIV in Escherichia coli 729574 2.3.1.240 overexpression of polyketide synthase PikAIII, and polyketide synthase PikAIV in Escherichia coli 729878 2.3.1.240 the picromycin/methymycin PKS genes (pikAI, PikAII, PikAIII, PikAIV and pikAV) are functionally expressed in the heterologous host Streptomyces lividans, resulting in production of both narbonolide and 10-deoxymethynolide 729578 2.3.1.240 the thioesterase domain of the methymycin/picromycin synthase (PICS) is functionally expressed in Escherichia coli 729193