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J Bacteriol. 1990 April; 172(4): 1877-1888

research-article

Characterization of the genetic elements required for site-specific integration of plasmid pSE211 in Saccharopolyspora erythraea.

Corporate Molecular Biology, Abbott Laboratories, Abbott Park, Illinois 60064.

ABSTRACT

The 18.1-kilobase plasmid pSE211 integrates into the chromosome of Saccharopolyspora erythraea at a specific attB site. Restriction analysis of the integrated plasmid, pSE211int, and adjacent chromosomal sequences allowed identification of attP, the plasmid attachment site. Nucleotide sequencing of attP, attB, attL, and attR revealed a 57-base-pair sequence common to all sites with no duplications of adjacent plasmid or chromosomal sequences in the integrated state, indicating that integration takes place through conservative, reciprocal strand exchange. An analysis of the sequences indicated the presence of a putative gene for Phe-tRNA at attB which is preserved at attL after integration has occurred. A comparison of the attB site for a number of actinomycete plasmids is presented. Integration at attB was also observed when a 2.4-kilobase segment of pSE211 containing attP and the adjacent plasmid sequence was used to transform a pSE211- host. Nucleotide sequencing of this segment revealed the presence of two complete open reading frames (ORFs) and a segment of a third ORF. The ORF adjacent to attP encodes a putative polypeptide 437 amino acids in length that shows similarity, at its C-terminal domain, to sequences of site-specific recombinases of the integrase family. The adjacent ORF encodes a putative 98-amino-acid basic polypeptide that contains a helix-turn-helix motif at its N terminus which corresponds to domains in the Xis proteins of a number of bacteriophages. A proposal for the function of this polypeptide is presented. The deduced amino acid sequence of the third ORF did not reveal similarities to polypeptide sequences in the current data banks.

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