Probable recombinase that does not seem to have a role in chromosome dimer resolution per se but rather may have some facilitative role during chromosome partitioning in general. Little effect on the percentage of cells with partition defects and no change in sporulation frequency. However, yopP disruption strongly increases the extent of the partitioning defects seen in codV mutant strains (by about two-fold) and, to a lesser extent, those seen in ripX and dif mutant strains. Belongs to the 'phage' integrase family.