>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=97.77 E-value=8.7e-05 Score=53.49 Aligned_cols=149 Identities=15% Similarity=0.154 Sum_probs=84.0 Q ss_pred CCCCCCCCCCCCC----CCCCCCCCCCEEECCCCCCCCCCCCCCEECCCCCCCCCCCCCCCCCHHHHHHHHHHHHC--CC Q ss_conf 6852323322243----31100124420102577665443455023137443334565001788999974444202--22 Q gi|254780277|r 387 IGSASFKIITDTM----DAFHSKPIAIAISTLDQKDDTSFKVETIFIDLSVHTSQDSTGKNTLTKEILSYLKKFFE--NE 460 (976) Q Consensus 387 ~~~ia~DtETt~l----d~~~~~ivGisls~~~~~~~~~~~~~~~yip~~~~~~~d~~~~~~~~~evl~~L~~lle--~~ 460 (976) T Consensus 3 lk~lsfDIE~~~~~gfp~~~~d~Ii~Is~~~~~g~~~--------~~~~----------~~~~E~~ll~~f~~~i~~~~P 64 (188) T cd05781 3 LKTLAFDIEVYSKYGTPNPRRDPIIVISLATSNGDVE--------FILA----------EGLDDRKIIREFVKYVKEYDP 64 (188) T ss_pred CEEEEEEEEECCCCCCCCCCCCCEEEEEEEECCCCEE--------EEEE----------CCCCHHHHHHHHHHHHHHCCC T ss_conf 4199999887689998998889789999996899769--------9984----------799989999999999987299 Q ss_pred CCHHHHCCC-CHHHHHHH----HCCCCCC--------------------C--CCCHHHHHHHHCCCCCCCCHHHHHHHHC Q ss_conf 100110032-12378898----6188666--------------------4--2100234554316876677246677622 Q gi|254780277|r 461 HFLKIGHNI-KYDKLVLH----RYGISMR--------------------G--FEDIMLMSYVLDSGRSSHDIASIAQKWL 513 (976) Q Consensus 461 ~i~kIgHN~-KfD~~~L~----~~GI~l~--------------------~--i~DTmlaayLLdp~~~~~~L~~la~~yL 513 (976) T Consensus 65 di-i~gyN~~~FD~pyl~~Ra~~~~i~l~~gr~~~~~~~~~~~~~~~i~Gr~~iDl~~~~~-~~~~l~sysL~~Va~-~l 141 (188) T cd05781 65 DI-IVGYNSNAFDWPYLVERARVLGVKLDVGRRGGSEPSTGVYGHYSITGRLNVDLYDFAE-EIPEVKVKTLENVAE-YL 141 (188) T ss_pred CE-EEECCCCCCCHHHHHHHHHHHCCCCCCCCCCCCCCCCCCCEEEEEEEEEEEECHHHHH-HHCCCCCCCHHHHHH-HH T ss_conf 99-9966986757899999999969985015567765122542069987899997789997-624756457999999-85 Q ss_pred CCC-CCCCCCCCCCCCC-CHH--HCCHHHHHHHHHHHHHHHHHHHHH Q ss_conf 444-2233565432221-000--000123333222111112456776 Q gi|254780277|r 514 SYT-RKEILKSRKSSIP-IDK--ISDSQVQEHAIENSNVILQLWLLL 556 (976) Q Consensus 514 ~~~-~~e~~~~~k~~~~-~~~--i~~e~~~~Yaa~Da~~t~~L~~~l 556 (976) T Consensus 142 g~~~k~e~~~~~~~~I~~~~~~~~~r~~l~~YnlqDa~L~~~L~~KL 188 (188) T cd05781 142 GVMKKSERVLIEWYRIYEYWDDEKKRDILLKYNRDDARSTYGLAEKL 188 (188) T ss_pred CCCCCCCCCCCCHHHHHHHHHCCCCHHHHHHHHHHHHHHHHHHHHCC T ss_conf 41224544657999999987084121699999788799999998429

HHsearch alignment for GI: 254780277 and conserved domain: cd05781