Antitoxin ParD

UniProtKB accession:  P22995

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UniProtKB description:  Antitoxin component of a type II toxin-antitoxin (TA) system involved in plasmid partition. Inhibits the anti-DNA gyrase activity of toxin ParE; reverses and restores gyrase catalytic activity in vitro. The parDE operon alone is capable of stabilizing an RK2-derived minireplicon under defined growth conditions in several different Gram-negative bacteria. It does so by the post-segregational killing (PSK) of plasmid-free cells, also referred to as a plasmid addiction system. Binds its own promoter, autorepressing it; gentically only ParD is required for full autorepression.