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Engineering the Marine Pseudoalteromonas haloplanktis TAC125 via the pMEGA Plasmid Targeted Curing Using PTasRNA Technology
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Engineering the Marine Pseudoalteromonas haloplanktis TAC125 via the pMEGA Plasmid Targeted Curing Using PTasRNA Technology
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Engineering the Marine Pseudoalteromonas haloplanktis TAC125 via the pMEGA Plasmid Targeted Curing Using PTasRNA Technology
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Journal Article
Engineering the Marine Pseudoalteromonas haloplanktis TAC125 via the pMEGA Plasmid Targeted Curing Using PTasRNA Technology
2025
Overview
Marine bacteria that have adapted to thrive in extreme environments, such as Pseudoalteromonas haloplanktis TAC125 (PhTAC125), offer a unique biotechnological potential. The discovery of an endogenous megaplasmid (pMEGA) raises questions about its metabolic impact and functional role in that strain. This study aimed at streamlining the host genetic background by curing PhTAC125 of the pMEGA plasmid using a sequential genetic approach. We combined homologous recombination by exploiting a suicide vector, with the PTasRNA gene-silencing technology interfering with pMEGA replication machinery. This approach led to the construction of the novel PhTAC125 KrPL2 strain, cured of the pMEGA plasmid, which exhibited no significant differences in growth behavior, though showcasing enhanced resistance to oxidative stress and a reduced capacity for biofilm formation. These findings represent a significant achievement in developing our understanding of the role of the pMEGA plasmid and the biotechnological applications of PhTAC125 in recombinant protein production. This opens up the possibility of exploiting valuable pMEGA genetic elements and further advancing the genetic tools for PhTAC125.
