TABLE 5.

DNA damage response proteins in Acinetobacter spp.

Protein	Function and comment
E. coli DNA damage proteins not found in Acinetobacter spp.
DinB	DNA polymerase II; error-prone polymerase involved in SOS mutagenesis
σ38	Stationary phase/stress response σ factor
SulA	Cell division inhibitor; induced during SOS response
FtsEX	Transporter of unknown function; induced during SOS response
LexA	Transcriptional regulator; primary regulator of SOS response
Recognized DNA damage response proteins in Acinetobacter spp.
UmuC	DNA polymerase V subunit; truncated to UmuC* (first 64 residues of UmuC) in A. baylyi ADP1
UmuDAb	DNA polymerase V subunit; 50% longer than E. coli UmuD protein, contains LexA-like protease recognition site, regulates expression of DdrR in response to DNA damage
DdrR	Unknown function; upregulated following induction of DNA damage in A. baylyi ADP1, found only in Acinetobacter spp.
RecA	Recombination protein A; upregulated following induction of DNA damage in A. baylyi ADP1, required for DNA damage-inducible regulation of DdrR