>TIGR02225 recomb_XerD tyrosine recombinase XerD; InterPro: IPR011932 Proteins in this entry are part of the wider so-called "phage" integrase fmaily which describes a number of recombinases with tyrosine active sites that transiently bind covalently to DNA. Many are associated with mobile DNA elements, including phage, transposons, and phase variation loci. This entry represents the chromosomally-encoded polypeptide XerD, which is closely related to, and interacts with, another chromosomally-encoded polypeptide, XerC (IPR011931 from INTERPRO). These proteins are site-specific tyrosine recombinases, which act by catalyzing the cutting and rejoining of the recombining DNA molecules . They form a cyclic heterotetrameric complex composed of two molecules of XerC and two molecules of XerD. 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. XerD is composed of two domains, an N-terminal alpha-helical domain, and a C-terminal domain composed mostly of alpha helices, with a three-stranded antiprallel beta sheet along one edge . The active site is found at the extreme C-terminal end of the polypeptide. Most of the C-terminal domain is structurally homologous to that of other "phage" integrases, but the active site regions of these enzymes are stucturally distinct.; GO: 0003677 DNA binding, 0006310 DNA recombination, 0007049 cell cycle, 0007059 chromosome segregation, 0015074 DNA integration, 0051301 cell division.

Probab=99.97  E-value=3.9e-31  Score=181.05  Aligned_cols=59  Identities=56%  Similarity=0.902  Sum_probs=57.6

Q ss_pred             CCCCCCHHHHHHHHHHHHCCCHHHHHHHHCCCCHHHHHHHHHCCHHHHHHHHHHHCHHH
Q ss_conf             21603638999999998089999999984888889999998639999999999958211
Q gi|254780490|r    2 STTAHTLRHSFATHLLSNGGDLRSIQSILGHSRLSTTQIYTNVNSKRMMEIYDQTHPSI   60 (67)
Q Consensus         2 ~~tpH~lRHt~at~l~~~G~~~~~vq~lLGH~~i~tT~~Y~~~~~~~~~~~~~~~~p~~   60 (67)
T Consensus       247 ~isPHtLRHSFATHLLenGADLR~VQeLLGHadisTTQIYTHV~~~~L~~~~~~~HPRa  305 (305)
T TIGR02225       247 PISPHTLRHSFATHLLENGADLRVVQELLGHADISTTQIYTHVARERLKEVHKKHHPRA  305 (305)
T ss_pred             CCCCCCCHHHHHHHHHHCCCCHHHHHHHHCCCHHHHHHHHHHHHHHHHHHHHHHHCCCC
T ss_conf             99975104679999873688276887774322147889999987999999999628899