>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=99.42 E-value=1.3e-12 Score=98.76 Aligned_cols=143 Identities=19% Similarity=0.333 Sum_probs=93.9 Q ss_pred CCCEEEEECCCCCCCCCCCEEEEEEEEEEECCEECCCEEEEEECCCCCCCCHHHEEECCCCCCCCCCCCCCCHHHHHHHH Q ss_conf 77589998467888888888999999999999880313798985888228865724202101232248521002344777 Q gi|254780818|r 6 KMRKIVFDIETTGLDSKNDRIIEIGAVELLDYSKTNRTFQVFLCPNGRKNSPEALKLHGITDEFLKDKPSFSSIFSEFWD 85 (245) Q Consensus 6 ~mr~iv~D~ETTGl~~~~d~Iieigav~i~~~~~~~~~f~~~i~P~~~~i~~~~~~ihGIt~~~l~~~p~f~ev~~~f~~ 85 (245) T Consensus 4 ~~~~ia~DtETtgl~~~~~~ivGisls-~~----~~~~~--Yi-P~~-h~~-------------~~~~l~~~~v~~~lk~ 61 (193) T cd06139 4 KAKVFAFDTETTSLDPMQAELVGISFA-VE----PGEAY--YI-PLG-HDY-------------GGEQLPREEVLAALKP 61 (193) T ss_pred CCCEEEEECCCCCCCCCCCEEEEEEEE-EC----CCCEE--EE-EEC-CCC-------------CCCCCCHHHHHHHHHH T ss_conf 598789978369998688849999998-07----99689--98-723-656-------------5446799999999999 Q ss_pred HHHCCCCEEEEECCCCCCCEEEECHHCCCCCCCCCCHHCCCHHCCCCCCCCC-CCCHHHHHHHH-CCCCCC--------- Q ss_conf 5300232023102322431121000001122221000011000000017764-22237899971-875455--------- Q gi|254780818|r 86 FFNEQNAEWIAHNAKFDVGFINAELQRINKDPLDPSRIIDTLSIARRKHPSS-RNDLNSLCKRY-GITISH--------- 154 (245) Q Consensus 86 fi~~~~~~lVaHNa~FD~~fL~~el~r~~~~~~~~~~~iDTl~lar~~~p~~-~~~L~~l~~~~-~i~~~~--------- 154 (245) T Consensus 62 ~led~~i~Kv~hn~k~D~~~L----~~~gi~~--~~~~~DTmiaa~ll~~~~~~~~L~~La~~~l~~~~~~~~~l~gkg~ 135 (193) T cd06139 62 LLEDPSIKKVGQNLKFDLHVL----ANHGIEL--RGPAFDTMLASYLLNPGRRRHGLDDLAERYLGHKTISFEDLVGKGK 135 (193) T ss_pred HHCCCCCCEEEECCHHHHHHH----HHCCCCC--CCCCHHHHHHHHHCCCCCCCCCHHHHHHHHHCCCCCCHHHHHCCCC T ss_conf 973999868875479789999----9839866--7830218999987279988889999999981887663899837785 Q ss_pred -----------CCCCCCHHHHHHHHHHHHHHHH Q ss_conf -----------5666402699999999999973 Q gi|254780818|r 155 -----------RSKHGALLDSHLLSDVYIKMMV 176 (245) Q Consensus 155 -----------r~~H~Al~Da~~~a~v~~~ll~ 176 (245) T Consensus 136 ~~~~~~~~~~~~~~~YAa~Da~~t~~L~~~l~~ 168 (193) T cd06139 136 KQITFDQVPLEKAAEYAAEDADITLRLYELLKP 168 (193) T ss_pred CCCCHHHCCHHHHHHHHHHHHHHHHHHHHHHHH T ss_conf 537831332999999999999999999999999

HHsearch alignment for GI: 254780818 and conserved domain: cd06139