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Multicopy plasmids bearing a small internal portion of the RhsA genetic element of Escherichia coli K-12 imparted a viability block on cultures grown to stationary phase in broth. Inclusion of the last 25 codons of the RhsA core open reading frame (called core-ORF) in the plasmid insert was crucial for eliciting this toxic effect. The toxic effect could be suppressed by including the adjacent Rhs component, dsORF-a1, on the multicopy plasmid. The toxic effect was enhanced in RpoS- strains.

A stationary-phase-dependent viability block governed by two different polypeptides from the RhsA genetic element of Escherichia coli K-12