Identification and Application of Plasmids Suitable for Transfer of Foreign DNA to Members of the Genus Gordonia

ABSTRACT Gene transfer systems for Gordonia polyisoprenivorans strains VH2 and Y2K based on electroporation and conjugation, respectively, were established. Several parameters were optimized, resulting in transformation efficiencies of >4 × 105 CFU/μg of plasmid DNA. In contrast to most previously described electroporation protocols, the highest efficiencies were obtained by applying a heat shock after the intrinsic electroporation. Under these conditions, transfer and autonomous replication of plasmid pNC9503 was also demonstrated to proceed in G. alkanivorans DSM44187, G. nitida DSM44499T, G. rubropertincta DSM43197T, G. rubropertincta DSM46038, and G. terrae DSM43249T. Conjugational plasmid DNA transfer to G. polyisoprenivorans resulted in transfer frequencies of up to 5 × 10−6 of the recipient cells. Recombinant strains capable of polyhydroxyalkanoate synthesis from alkanes were constructed.

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