helicase-exonuclease AddAB, AddA subunit, Firmicutes type
AddAB, also called RexAB, substitutes for RecBCD in several bacterial lineages. These DNA recombination proteins act before synapse and are particularly important for DNA repair of double-stranded breaks by homologous recombination. The term AddAB is used broadly, with AddA homologous between the Firmicutes (as modeled here) and the alphaproteobacteria, while the partner AddB proteins show no strong homology across the two groups of species. [DNA metabolism, DNA replication, recombination, and repair]
Jiyao W et al.(2023). "The conserved domain database in 2023.",