>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=99.09 E-value=1.2e-08 Score=74.43 Aligned_cols=153 Identities=17% Similarity=0.190 Sum_probs=92.5 Q ss_pred CCEEEEEECCCCCCCCCCCCCHHHCCCCEEEEEEEEECCEEEEEEECCC--CHHHHHHHHHHHC--CCCCEEEEEEH-HH Q ss_conf 9689998141789870004400112798199999998480399997888--1043799999863--88981999730-77 Q gi|254781193|r 1 MATLFIDFETRSPIDLTKCGICKYAEDVCVILFAFGFDDHPVELWDCVH--DPVMPQVLKEALE--NTDVTIVAHNS-YF 75 (675) Q Consensus 1 mk~i~lD~ET~~~~dl~~~Gl~~y~~~~~i~~i~~a~~~~~v~~~d~~~--~~~~~~~l~~~L~--~~~~~kV~HNa-~F 75 (675) T Consensus 3 lk~lsfDIE~~~~~gfp------~~~~d~Ii~Is~~~~~g~~~~~~~~~~~E~~ll~~f~~~i~~~~Pdii-~gyN~~~F 75 (188) T cd05781 3 LKTLAFDIEVYSKYGTP------NPRRDPIIVISLATSNGDVEFILAEGLDDRKIIREFVKYVKEYDPDII-VGYNSNAF 75 (188) T ss_pred CEEEEEEEEECCCCCCC------CCCCCCEEEEEEEECCCCEEEEEECCCCHHHHHHHHHHHHHHCCCCEE-EECCCCCC T ss_conf 41999998876899989------988897899999968997699984799989999999999987299999-96698675 Q ss_pred HHHHHHH---HCCCCCCC-------------------CC-EEEHHHHHHH-HC-CCCCHHHHHHHCCCCC--C-HHHHHH Q ss_conf 4999998---60899884-------------------20-3316889998-67-8999689899829981--1-004379 Q gi|254781193|r 76 ERTVLKA---CFNLDIPI-------------------HR-WICTLVLARS-NG-LPSALKAVGEALKLSS--Q-KMEEGK 127 (675) Q Consensus 76 D~~~L~~---~~Gi~i~~-------------------~~-~~DTmi~A~~-l~-~~~sL~~la~~l~l~~--~-k~~~~k 127 (675) T Consensus 76 D~pyl~~Ra~~~~i~l~~gr~~~~~~~~~~~~~~~i~Gr~~iDl~~~~~~~~~l~sysL~~Va~~lg~~~k~e~~~~~~~ 155 (188) T cd05781 76 DWPYLVERARVLGVKLDVGRRGGSEPSTGVYGHYSITGRLNVDLYDFAEEIPEVKVKTLENVAEYLGVMKKSERVLIEWY 155 (188) T ss_pred CHHHHHHHHHHHCCCCCCCCCCCCCCCCCCCEEEEEEEEEEEECHHHHHHHCCCCCCCHHHHHHHHCCCCCCCCCCCCHH T ss_conf 78999999999699850155677651225420699878999977899976247564579999998541224544657999 Q ss_pred HHHHHHCCCCCCCCCCCCCCCCCHHHHHHHHHHHHHHHHHHHHHHHHC Q ss_conf 999862021123433234678585328999999899899999999630 Q gi|254781193|r 128 ELIARFCKGETHECLYDRNKPNHREAWRLFGEYCKGDVTVTREIFKRL 175 (675) Q Consensus 128 ~l~~~~~k~~~~~~~~~~~~~~~~~~~~~~~~Ya~~Dv~~t~~L~~~l 175 (675) T Consensus 156 ~I~~~--------------~-~~~~~r~~l~~YnlqDa~L~~~L~~KL 188 (188) T cd05781 156 RIYEY--------------W-DDEKKRDILLKYNRDDARSTYGLAEKL 188 (188) T ss_pred HHHHH--------------H-HCCCCHHHHHHHHHHHHHHHHHHHHCC T ss_conf 99998--------------7-084121699999788799999998429

HHsearch alignment for GI: 254781193 and conserved domain: cd05781