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J. Bacteriol., Feb 1997, 1420-1422, Vol 179, No. 4
Copyright © 1997, American Society for Microbiology

The inactivated plasmid inititator protein RepC/RepC* may have a regulatory role

A Rasooly and RS Rasooly
Skirball Institute, New York University Medical Center, New York, USA.

During replication of the plasmid pT181, the initiator protein RepC is modified by the addition of an oligodeoxynucleotide, giving rise to a new form, RepC*. Here we show that during in vitro replication, RepC* is radioactively labeled, suggesting that the source of the RepC* oligodeoxynucleotide is the newly synthesized pT181 DNA. The RepC/RepC* heterodimer retains its ability to bind the pT181 double-strand origin and, therefore, it may act as a competitive inhibitor of the RepC homodimer during replication.