>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=100.00 E-value=5.9e-39 Score=302.72 Aligned_cols=187 Identities=30% Similarity=0.543 Sum_probs=172.1 Q ss_pred HHHCCCCCCCCCCCCCCCCCCCCCCCEEECCCCCCCCCCCCCCEECCCCCCCCCCCCCCCCCHHHHHHHHHHHHCCCCCH Q ss_conf 98668523233222433110012442010257766544345502313744333456500178899997444420222100 Q gi|254780277|r 384 LETIGSASFKIITDTMDAFHSKPIAIAISTLDQKDDTSFKVETIFIDLSVHTSQDSTGKNTLTKEILSYLKKFFENEHFL 463 (976) Q Consensus 384 L~~~~~ia~DtETt~ld~~~~~ivGisls~~~~~~~~~~~~~~~yip~~~~~~~d~~~~~~~~~evl~~L~~lle~~~i~ 463 (976) T Consensus 2 l~~~~~ia~DtETtgl~~~~~~ivGisls~~~~~--------~~YiP~~h~~~----~~~l~~~~v~~~lk~~led~~i~ 69 (193) T cd06139 2 LEKAKVFAFDTETTSLDPMQAELVGISFAVEPGE--------AYYIPLGHDYG----GEQLPREEVLAALKPLLEDPSIK 69 (193) T ss_pred CCCCCEEEEECCCCCCCCCCCEEEEEEEEECCCC--------EEEEEECCCCC----CCCCCHHHHHHHHHHHHCCCCCC T ss_conf 7559878997836999868884999999807996--------89987236565----44679999999999997399986 Q ss_pred HHHCCCCHHHHHHHHCCCCCCC-CCCHHHHHHHHCCCCCCCCHHHHHHHHCCCCC---CCCCCCCCCCCCCHHHCCHHHH Q ss_conf 1100321237889861886664-21002345543168766772466776224442---2335654322210000001233 Q gi|254780277|r 464 KIGHNIKYDKLVLHRYGISMRG-FEDIMLMSYVLDSGRSSHDIASIAQKWLSYTR---KEILKSRKSSIPIDKISDSQVQ 539 (976) Q Consensus 464 kIgHN~KfD~~~L~~~GI~l~~-i~DTmlaayLLdp~~~~~~L~~la~~yL~~~~---~e~~~~~k~~~~~~~i~~e~~~ 539 (976) T Consensus 70 Kv~hn~k~D~~~L~~~gi~~~~~~~DTmiaa~ll~~~~~~~~L~~La~~~l~~~~~~~~~l~gkg~~~~~~~~~~~~~~~ 149 (193) T cd06139 70 KVGQNLKFDLHVLANHGIELRGPAFDTMLASYLLNPGRRRHGLDDLAERYLGHKTISFEDLVGKGKKQITFDQVPLEKAA 149 (193) T ss_pred EEEECCHHHHHHHHHCCCCCCCCCHHHHHHHHHCCCCCCCCCHHHHHHHHHCCCCCCHHHHHCCCCCCCCHHHCCHHHHH T ss_conf 88754797899999839866783021899998727998888999999998188766389983778553783133299999 Q ss_pred HHHHHHHHHHHHHHHHHHHHHHH-HHHHHHHHHHCCCCHHHHHH Q ss_conf 33222111112456776322210-00134578860750123322 Q gi|254780277|r 540 EHAIENSNVILQLWLLLRPKLIV-EKLLHVYERLDKPMIDVVSQ 582 (976) Q Consensus 540 ~Yaa~Da~~t~~L~~~l~~~L~~-~~l~~l~~~iE~Pl~~vLa~ 582 (976) T Consensus 150 ~YAa~Da~~t~~L~~~l~~~L~~~~~l~~ly~~iE~PL~~VLa~ 193 (193) T cd06139 150 EYAAEDADITLRLYELLKPKLKEEPGLLELYEEIEMPLIPVLAE 193 (193) T ss_pred HHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCHHHHHCC T ss_conf 99999999999999999999984220999999984569998279

HHsearch alignment for GI: 254780277 and conserved domain: cd06139