>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=100.00 E-value=3.1e-34 Score=218.41 Aligned_cols=161 Identities=42% Similarity=0.630 Sum_probs=134.5 Q ss_pred HHHHHHHHHHHHCCCCCCHHHHHHHHHHCCCHHHHHCCCCCCCCCCCHHHHHHHHHCCCCC-CCCCCCCCCHHHHHHHHH Q ss_conf 4699998643200125610277654311000122100134333432000001111000111-222111110000124788 Q gi|255764498|r 104 TIANLLEQAKIEAENPAPGQWKRVRIFLLIELLYATGMRVSELVTLSAHTLNLTERTMIIQ-GKGNKERLVILSPSALHA 182 (300) Q Consensus 104 e~~~ll~~~~~~~~~~~~~~~~~~R~~~il~ll~~tGlR~~Ei~~L~~~di~~~~~~i~v~-~K~~k~R~ipi~~~~~~~ 182 (300) T Consensus 1 e~~~~~~~~~~~---------~~~r~r~~~~l~~~tGlR~~Ei~~L~~~di~~~~~~i~i~~~K~~~~r~vpi~~~~~~~ 71 (164) T cd00397 1 EIERLLAAAEAS---------TPERLYLALLLLLATGLRISELCALRWSDIDLDKRVIHITGTKTKKERTVPLSEEALKL 71 (164) T ss_pred CHHHHHHHHHHC---------CCHHHHHHHHHHHHHCCCHHHHHCCCCCCCCCCCCEEEEECCCCCCCCCCCCCCHHHHH T ss_conf 989999765146---------79889999999999781999996384620567764799835646653336676012346 Q ss_pred HHHHHHHHCCCCCCCCCCCCCCCCCC--CCCCCCCCCCCCHHHHHHHCCCCCCCCCHHHHHHHHHHHHHHCCCCHHHHHH Q ss_conf 75323210012467775200123332--2222111111101234420146676425988588999999985888889999 Q gi|255764498|r 183 LQMYKKTCSSMKMTGNDLWLFPSSTK--TGHLSRQVFARDLKALAARAGIQKKNISPHIIRHAFASHLLEGGADLRTIQI 260 (300) Q Consensus 183 l~~y~~~~~~~~~~~~~~~lf~~~~~--~~~~s~~~~~~~~~~~~~~~gi~~~~~t~H~lRht~at~l~~~G~~~~~v~~ 260 (300) T Consensus 72 l~~~~~~~~~~~--~~~~~lf~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~H~lRht~at~l~~~g~~~~~I~~ 149 (164) T cd00397 72 LKEYLKKRRPAN--GDEEYLFPSRRGGPAATLSRRNVKRIFKAAGRRAGIDKEGLTPHSLRHTFASALLNAGLDLEAVQD 149 (164) T ss_pred HHHHHHHHCCCC--CCCCCEEECCCCCCCCCHHHHHHHHHHHHHHHHHCCCCCCCCCCCCHHHHHHHHHHCCCCHHHHHH T ss_conf 888898850146--875412113689866520467899997899998336765677566589999999996999999999 Q ss_pred HHCCCCHHHHHHHHH Q ss_conf 855899899899964 Q gi|255764498|r 261 LLGHTDISTTQIYTH 275 (300) Q Consensus 261 ~lGH~s~~tT~~Y~~ 275 (300) T Consensus 150 ~lGHs~~~tT~~Y~h 164 (164) T cd00397 150 LLGHSSIAMTMRYAH 164 (164) T ss_pred HHCCCCHHHHHHCCC T ss_conf 968999889711839

HHsearch alignment for GI: 255764498 and conserved domain: cd00397