Use of a nonhomologous end joining deficient strain (Deltaku70) of the ergot fungus Claviceps purpurea for identification of a nonribosomal peptide synthetase gene involved in ergotamine biosynthesis.

Abstract excerpt

The ergot fungus Claviceps purpurea uses mainly the nonhomologous-end-joining (NHEJ) system for integration of exogenous DNA, leading to a low frequency of homologous integration (1-2%). To improve gene targeting efficiency we deleted the C. purpurea ku70 gene in two different strains: the pathogenic strain 20.1 and the apathogenic, ergot alkaloid producing strain P1. The mutants were not impaired in vegetative...

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