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• W1931542007 abstract "The trfA gene, encoding the essential replication initiation protein of the broad-host-range plasmid RK2, possesses an in-frame overlapping arrangement. This results in the production of TrfA proteins of 33 and 44 kDa, respectively. Utilizing deletion and site-specific mutagenesis to alter the trfA operon, we compared the replication of an RK2-origin plasmid in several distantly related gram-negative bacteria when supported by both TrfA-44 and TrfA-33, TrfA-33 alone, or TrfA-44/98L (a mutant form of the TrfA-44 protein) alone. TrfA-44/98L is identical to wild-type TrfA-44 with the exception of a single conservative amino acid alteration from methionine to leucine at codon 98; this alteration removes the translational start codon for the TrfA-33 protein. Copy number and stability were virtually identical for plasmids containing both TrfA-44 and TrfA-33 proteins or TrfA-44/98L alone in Pseudomonas aeruginosa and Agrobacterium tumefaciens, two unrelated bacteria in which TrfA-33 is poorly functional. This, along with recent in vitro studies comparing TrfA-44, TrfA-33, and TrfA-44/98L, suggests that the functional activity of TrfA-44 is not significantly affected by the 98L mutation. Analysis of minimal RK2 derivatives in certain gram-negative bacterial hosts suggests a role of the overlapping arrangement of trfA in facilitating the broad host range of RK2. RK2 derivatives encoding TrfA-44/98L alone demonstrated decreased copy number and stability in Escherichia coli and Azotobacter vinelandii when compared with derivatives specifying both TrfA-44 and TrfA-33. A strategy employing the trfA-44/98L mutant gene and in vivo homologous recombination was used to eliminate the internal translational start codon of trfA in the intact RK2 plasmid. The mutant intact RK2 plasmid produced only TrfA-44/98L. A small reduction in copy number and beta-lactamase expression resulted in E. coli, suggesting that overlapping trfA genes also enhance the efficiency of replication of the intact RK2 plasmid." @default.
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• W1931542007 date "1991-09-01" @default.
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• W1931542007 title "Broad-host-range properties of plasmid RK2: importance of overlapping genes encoding the plasmid replication initiation protein TrfA" @default.
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• W1931542007 doi "https://doi.org/10.1128/jb.173.18.5861-5868.1991" @default.
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