>cd06139 DNA_polA_I_Ecoli_like_exo The 3'-5' exonuclease domain of DNA polymerases has a fundamental role in reducing polymerase errors and is involved in proofreading activity. E.coli-like Polymerase I (pol I), a subgroup of family-A DNA polymerases, contains a DEDDy-type DnaQ-like 3'-5' exonuclease domain in the same polypeptide chain as the polymerase domain. The exonuclease domain contains three conserved 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 contain four conserved acidic residues that serve as ligands for the two metal ions required for catalysis. E. coli DNA pol I is involved in genome replication but is not the main replicating enzyme. It is also implicated in DNA repair.

Probab=99.94 E-value=3.3e-25 Score=181.56 Aligned_cols=173 Identities=18% Similarity=0.170 Sum_probs=131.7 Q ss_pred CEEEEEECCCCCCCCCCCCCHHHCCCCEEEEEEEEECCEEEEEEECCCC--------HHHHHHHHHHHCCCCCEEEEEEH Q ss_conf 6899981417898700044001127981999999984803999978881--------04379999986388981999730 Q gi|254781193|r 2 ATLFIDFETRSPIDLTKCGICKYAEDVCVILFAFGFDDHPVELWDCVHD--------PVMPQVLKEALENTDVTIVAHNS 73 (675) Q Consensus 2 k~i~lD~ET~~~~dl~~~Gl~~y~~~~~i~~i~~a~~~~~v~~~d~~~~--------~~~~~~l~~~L~~~~~~kV~HNa 73 (675) T Consensus 6 ~~ia~DtETtgl--------~~~--~~~ivGisls~~~~~~~YiP~~h~~~~~~l~~~~v~~~lk~~led~~i~Kv~hn~ 75 (193) T cd06139 6 KVFAFDTETTSL--------DPM--QAELVGISFAVEPGEAYYIPLGHDYGGEQLPREEVLAALKPLLEDPSIKKVGQNL 75 (193) T ss_pred CEEEEECCCCCC--------CCC--CCEEEEEEEEECCCCEEEEEECCCCCCCCCCHHHHHHHHHHHHCCCCCCEEEECC T ss_conf 878997836999--------868--8849999998079968998723656544679999999999997399986887547 Q ss_pred HHHHHHHHHHCCCCCCCCCEEEHHHHHHHHCC---CCCHHHHHHHC-CCCCCHHHHHHHHHHHHCCCCCCCCCCCCCCCC Q ss_conf 77499999860899884203316889998678---99968989982-998110043799998620211234332346785 Q gi|254781193|r 74 YFERTVLKACFNLDIPIHRWICTLVLARSNGL---PSALKAVGEAL-KLSSQKMEEGKELIARFCKGETHECLYDRNKPN 149 (675) Q Consensus 74 ~FD~~~L~~~~Gi~i~~~~~~DTmi~A~~l~~---~~sL~~la~~l-~l~~~k~~~~k~l~~~~~k~~~~~~~~~~~~~~ 149 (675) T Consensus 76 k~D~~~L~~~-gi~~~-~~~~DTmiaa~ll~~~~~~~~L~~La~~~l~~~~~~---~~~l~g---k-------g~~~~~~ 140 (193) T cd06139 76 KFDLHVLANH-GIELR-GPAFDTMLASYLLNPGRRRHGLDDLAERYLGHKTIS---FEDLVG---K-------GKKQITF 140 (193) T ss_pred HHHHHHHHHC-CCCCC-CCCHHHHHHHHHCCCCCCCCCHHHHHHHHHCCCCCC---HHHHHC---C-------CCCCCCH T ss_conf 9789999983-98667-830218999987279988889999999981887663---899837---7-------8553783 Q ss_pred CHHHHHHHHHHHHHHHHHHHHHHHHCCCCHHCCCCHHHHHHHHHHCCCCC Q ss_conf 85328999999899899999999630104000151336666531156213 Q gi|254781193|r 150 HREAWRLFGEYCKGDVTVTREIFKRLEPLSSKEQELWYLDQTINDRGYCV 199 (675) Q Consensus 150 ~~~~~~~~~~Ya~~Dv~~t~~L~~~l~~~~~~E~~~~~~~~~me~~Gi~v 199 (675) T Consensus 141 ~~~~~~~~~~YAa~Da~~t~~L~~~l~~~L~~~~~l~~ly~~iE~PL~~V 190 (193) T cd06139 141 DQVPLEKAAEYAAEDADITLRLYELLKPKLKEEPGLLELYEEIEMPLIPV 190 (193) T ss_pred HHCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCHHHH T ss_conf 13329999999999999999999999999984220999999984569998

HHsearch alignment for GI: 254781193 and conserved domain: cd06139