Cloning the Tra1 region of RP1 - PubMed (original) (raw)
Cloning the Tra1 region of RP1
J Watson et al. Plasmid. 1980 Sep.
Abstract
The Tra1 region of RP1 from a derivative with Tn7 inserted into the kanamycin resistance determinant was cloned, using EcoRI, into the multicopy vector plasmid pBR325. For one orientation of the cloned fragment the resultant chimeric plasmid was very frequently lost from the cell, but in the other orientation it was much more stable and also compatible with RP1. Complementation by the stable chimeric plasmid, pED800, of a series of RP1 tra mutants showed that the mutations of all those retaining sensitivity to the P-specific phages PRR1, Pf3, and PR4, or only to PR4, mapped in the Tra1 region, while only 2 out of 20 amber mutations leading to full P-specific phage-resistance did so.
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