| Primary Identifier | IPR039418 | Type | Domain |
| Short Name | LexA-like |
| description | Peptidase S24 LexA-like proteins are involved in the SOS response leading to the repair of single-stranded DNA within the bacterial cell []. Proteins containing this domain includes LexA, MucA and UmuD. LexA () is the repressor of genes in the cellular SOS response to DNA damage []. The LexA-like proteins contain two-domains: an N-terminal DNA binding domain and a C-terminal domain (CTD) that provides LexA dimerization as well as cleavage activity []. They undergo autolysis, cleaving at an Ala-Gly or a Cys-Gly bond, separating the DNA-binding domain from the rest of the protein []. The LexA, UmuD and MucD proteins interact with RecA, which activates self cleavage either derepressing transcription in the case of LexA []or activating the lesion-bypass polymerase in the case of UmuD and MucA. UmuD'2, is the homodimeric component of DNA pol V, which is produced from UmuD by RecA-facilitated self-cleavage. The first 24 N-terminal residues of UmuD are removed; UmuD'2 is a DNA lesion bypass polymerase [, ]. MucA [, ], like UmuD, is a plasmid encoded a DNA polymerase (pol RI) which is converted into the active lesion-bypass polymerase by a self-cleavage reaction involving RecA []. |
