Tyr recombinase (PS51898) is responsible for a diverse array of sequence-specific DNA rearrangements in biological systems. The following are some of these processes: conjugative transposition, the resolution of DNA circles, the control of plasmid copy number, DNA excision, the regulation of gene expression for nitrogen fixation and DNA inversion in Houttuynia cordata, and the control of gene expression for cell surface proteins or DNA replication.