>cd05781 DNA_polB_B3_exo The 3'-5' exonuclease domain of archaeal proteins with similarity to Sulfurisphaera ohwakuensis DNA polymerase B3. B3 is a family-B DNA polymerase. Family-B DNA polymerases contain an N-terminal DEDDy DnaQ-like exonuclease domain in the same polypeptide chain as the polymerase domain, similar to family-A DNA polymerases. B3 exhibits both polymerase and 3'-5' exonuclease activities. This exonuclease domain contains three sequence motifs termed ExoI, ExoII and ExoIII, with a specific YX(3)D pattern at ExoIII. These motifs are clustered around the active site and are involved in metal binding and catalysis. The exonuclease domain of family B polymerases also contains a beta hairpin structure that plays an important role in active site switching in the event of nucleotide misincorporation. Archaeal proteins that are involved in DNA replication are similar to those from eukaryotes. Some archaea possess multiple family-B DNA polymerases. B3 is mainly found in crenarch

Probab=98.51 E-value=4.9e-07 Score=63.95 Aligned_cols=117 Identities=17% Similarity=0.257 Sum_probs=74.5 Q ss_pred CCEEEEECCCCC----CCCCCCEEEEEEEEEEECCEECCCEEEEEECCCCCCCCHHHEEECCCCCCCCCCCCCCCHHHHH Q ss_conf 758999846788----8888888999999999999880313798985888228865724202101232248521002344 Q gi|254780818|r 7 MRKIVFDIETTG----LDSKNDRIIEIGAVELLDYSKTNRTFQVFLCPNGRKNSPEALKLHGITDEFLKDKPSFSSIFSE 82 (245) Q Consensus 7 mr~iv~D~ETTG----l~~~~d~Iieigav~i~~~~~~~~~f~~~i~P~~~~i~~~~~~ihGIt~~~l~~~p~f~ev~~~ 82 (245) T Consensus 3 lk~lsfDIE~~~~~gfp~~~~d~Ii~Is~~-~~~g~~-----~~~~~~----------------------~~~E~~ll~~ 54 (188) T cd05781 3 LKTLAFDIEVYSKYGTPNPRRDPIIVISLA-TSNGDV-----EFILAE----------------------GLDDRKIIRE 54 (188) T ss_pred CEEEEEEEEECCCCCCCCCCCCCEEEEEEE-ECCCCE-----EEEEEC----------------------CCCHHHHHHH T ss_conf 419999988768999899888978999999-689976-----999847----------------------9998999999 Q ss_pred HHHHHHCCC-CEEEEECC-CCCCCEEEECHHCCCCCC-------------------CCCCHHCCCHHCCCCCCCCCCCCH Q ss_conf 777530023-20231023-224311210000011222-------------------210000110000000177642223 Q gi|254780818|r 83 FWDFFNEQN-AEWIAHNA-KFDVGFINAELQRINKDP-------------------LDPSRIIDTLSIARRKHPSSRNDL 141 (245) Q Consensus 83 f~~fi~~~~-~~lVaHNa-~FD~~fL~~el~r~~~~~-------------------~~~~~~iDTl~lar~~~p~~~~~L 141 (245) T Consensus 55 f~~~i~~~~Pdii~gyN~~~FD~pyl~~Ra~~~~i~l~~gr~~~~~~~~~~~~~~~i~Gr~~iDl~~~~~~~~~l~sysL 134 (188) T cd05781 55 FVKYVKEYDPDIIVGYNSNAFDWPYLVERARVLGVKLDVGRRGGSEPSTGVYGHYSITGRLNVDLYDFAEEIPEVKVKTL 134 (188) T ss_pred HHHHHHHCCCCEEEECCCCCCCHHHHHHHHHHHCCCCCCCCCCCCCCCCCCCEEEEEEEEEEEECHHHHHHHCCCCCCCH T ss_conf 99999872999999669867578999999999699850155677651225420699878999977899976247564579 Q ss_pred HHHHHHHCCC Q ss_conf 7899971875 Q gi|254780818|r 142 NSLCKRYGIT 151 (245) Q Consensus 142 ~~l~~~~~i~ 151 (245) T Consensus 135 ~~Va~~lg~~ 144 (188) T cd05781 135 ENVAEYLGVM 144 (188) T ss_pred HHHHHHHCCC T ss_conf 9999985412

HHsearch alignment for GI: 254780818 and conserved domain: cd05781