A process of unidirectional viral DNA replication that takes place on a circular DNA to rapidly produce numerous copies of the viral genome. Involves creating a nick in one strand of the circular DNA molecule at the origin of replication. DNA is then synthesized by DNA polymerase. Using the non-nicked strand as a template, replication proceeds around the circular DNA molecule, displacing the nicked strand as single-stranded DNA.

excinuclease repair complex

Any of the protein complexes formed by the UvrABC excinuclease system, which carries out nucleotide excision repair. Three different complexes are formed by the 3 proteins as they proceed through the excision repair process. First a complex consisting of two A subunits and two B subunits bind DNA and unwind it around the damaged site. Then, the A subunits disassociate leaving behind a stable complex between B subunits and DNA. Now, subunit C binds to this B+DNA complex and causes subunit B to nick the DNA on one side of the complex while subunit C nicks the DNA on the other side of the complex. DNA polymerase I and DNA ligase can then repair the resulting gap.