Site-specific tyrosine recombinase, which acts by catalyzing the cutting and rejoining of the recombining DNA molecules. The XerC-XerD complex is essential to convert dimers of the bacterial chromosome into monomers to permit their segregation at cell division. It also contributes to the segregational stability of plasmids. Forms a cyclic heterotetrameric complex composed of two molecules of XerC and two molecules of XerD (By similarity). Co-immunoprecipitates with DarG in the presence and absence of darT (PubMed:32634279). Was identified as a high-confidence drug target. Belongs to the 'phage' integrase family. XerD subfamily.