>cd00397 DNA_BRE_C DNA breaking-rejoining enzymes, C-terminal catalytic domain. The DNA breaking-rejoining enzyme superfamily includes type IB topoisomerases and tyrosine recombinases that share the same fold in their catalytic domain containing six conserved active site residues. The best-studied members of this diverse superfamily include human topoisomerase I, the bacteriophage lambda integrase, the bacteriophage P1 Cre recombinase, the yeast Flp recombinase and the bacterial XerD/C recombinases. Their overall reaction mechanism is essentially identical and involves cleavage of a single strand of a DNA duplex by nucleophilic attack of a conserved tyrosine to give a 3' phosphotyrosyl protein-DNA adduct. In the second rejoining step, a terminal 5' hydroxyl attacks the covalent adduct to release the enzyme and generate duplex DNA. The enzymes differ in that topoisomerases cleave and then rejoin the same 5' and 3' termini, whereas a site-specific recombinase transfers a 5' hydroxyl gener

Probab=99.98 E-value=4.8e-33 Score=225.74 Aligned_cols=159 Identities=33% Similarity=0.401 Sum_probs=135.7 Q ss_pred HHHHHHHHHHHCCCCCCCHHHHHHHCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCEEEC-CCCCCCCCCCCCCCCHHHHH Q ss_conf 15678776531013567757753201222100112332222211222223323220332-37853100011221002343 Q gi|254780882|r 133 QALTLVDNVLLHTSHETKWIDARNSAILYLLYGCGLRISEALSLTPQNIMDDQSTLRIQ-GKGDKIRIVPLLPSVRKAIL 211 (328) Q Consensus 133 e~~~ll~~~~~~~~~~~~~~~~Rd~~i~~ll~~TGlR~~El~~L~~~did~~~~~i~v~-gKg~K~R~Vpi~~~~~~~l~ 211 (328) T Consensus 1 e~~~~~~~~~~~~~-------~r~r~~~~l~~~tGlR~~Ei~~L~~~di~~~~~~i~i~~~K~~~~r~vpi~~~~~~~l~ 73 (164) T cd00397 1 EIERLLAAAEASTP-------ERLYLALLLLLATGLRISELCALRWSDIDLDKRVIHITGTKTKKERTVPLSEEALKLLK 73 (164) T ss_pred CHHHHHHHHHHCCC-------HHHHHHHHHHHHHCCCHHHHHCCCCCCCCCCCCEEEEECCCCCCCCCCCCCCHHHHHHH T ss_conf 98999976514679-------88999999999978199999638462056776479983564665333667601234688 Q ss_pred HHHHHHCCCCCCCCCCCCCCCCCCCC---CCCCCHHHHHHHHHHHCCCC-CCCCCCCCHHHHHHHHHHCCCCHHHHHHHH Q ss_conf 22111001234466554321111221---11000123567899976869-998805417999999998489988999983 Q gi|254780882|r 212 EYYDLCPFDLNLNIQLPLFRGIRGKP---LNPGVFQRYIRQLRRYLGLP-LSTTAHTLRHSFATHLLSNGGDLRSIQSIL 287 (328) Q Consensus 212 ~yl~~~~~~~~~~~~~~lF~~~~g~~---ls~~~i~~~~~~~~~~~gi~-~~~spH~lRHtfAt~ll~~G~~~~~v~~~l 287 (328) T Consensus 74 ~~~~~~~~~--~~~~~~lf~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~H~lRht~at~l~~~g~~~~~I~~~l 151 (164) T cd00397 74 EYLKKRRPA--NGDEEYLFPSRRGGPAATLSRRNVKRIFKAAGRRAGIDKEGLTPHSLRHTFASALLNAGLDLEAVQDLL 151 (164) T ss_pred HHHHHHCCC--CCCCCCEEECCCCCCCCCHHHHHHHHHHHHHHHHHCCCCCCCCCCCCHHHHHHHHHHCCCCHHHHHHHH T ss_conf 889885014--687541211368986652046789999789999833676567756658999999999699999999996 Q ss_pred CCCCHHHHHHHHH Q ss_conf 7888789799996 Q gi|254780882|r 288 GHFRLSTTQIYTN 300 (328) Q Consensus 288 GH~s~~tT~~Y~h 300 (328) T Consensus 152 GHs~~~tT~~Y~h 164 (164) T cd00397 152 GHSSIAMTMRYAH 164 (164) T ss_pred CCCCHHHHHHCCC T ss_conf 8999889711839

HHsearch alignment for GI: 254780882 and conserved domain: cd00397