Abstract
A two-vector system was developed for heterologous expression of the three genes comprising the 6-deoxyerythronolide B synthase (DEBS) polyketide gene cluster. Individual DEBS genes and pairwise combinations of two such genes were each cloned downstream of the actinorhodin (actI) promoter in two compatible Streptomyces vectors: the autonomously replicating vector, pKAO127′Kan′, and the integrating vector, pSET152. The resulting plasmids were either simultaneously or sequentially transformed into Streptomyces lividans K4-114. Efficient trans-complementation of modular polyketide synthase subunit proteins occurred when the respective genes were transcribed from the two vectors and resulted in production of the erythromycin precursor 6-deoxyerythronolide B (6-dEB). Journal of Industrial Microbiology & Biotechnology (2000) 24, 46–50.
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