>cd06131 DNA_pol_III_epsilon_Ecoli_like This subfamily is composed of the epsilon subunit of Escherichia coli DNA polymerase III (polIII) and similar proteins. PolIII is the main DNA replicating enzyme in bacteria, functioning as the chromosomal replicase. It is a holoenzyme complex of ten different subunits, three of which (alpha, epsilon, and theta) compose the catalytic core. The polIII epsilon subunit, encoded by the dnaQ gene, is a DEDDh-type 3'-5' exonuclease which is responsible for the proofreading activity of the polymerase, increasing the fidelity of DNA synthesis. It contains three conserved sequence motifs termed ExoI, ExoII and ExoIII, with a specific Hx(4)D conserved 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. The epsilon subunit of polIII also functions as a stabilizer of the holoenzyme complex.

Probab=99.07 E-value=1.3e-09 Score=75.14 Aligned_cols=125 Identities=25% Similarity=0.320 Sum_probs=75.4 Q ss_pred EEEECCCCCCCCCC-CEEEEEEEEE-----C---CCCE-EEECCCCCC-C--------------CC-------HHHHHHH Q ss_conf 79971777898544-5079999841-----8---9428-997465778-5--------------70-------6776777 Q gi|254780636|r 23 IAVDTETLGLMPRR-DRLCIVQLSP-----G---DGTV-DIIRIAAGQ-K--------------NA-------PNLVGML 70 (207) Q Consensus 23 iaiDtEt~~l~~~~-~~l~LiQl~~-----~---~~~~-~l~~~~~~~-~--------------~~-------~~L~~ll 70 (207) T Consensus 2 Vv~D~ETTGl~p~~~d~I--ieigav~~~~~~~~~~~~~~lv~P~~~i~~~~~~ihGIt~e~l~~~p~~~ev~~~f~~~l 79 (167) T cd06131 2 IVLDTETTGLDPREGHRI--IEIGCVELINRRLTGNTFHVYINPERDIPEEAFKVHGITDEFLADKPKFAEIADEFLDFI 79 (167) T ss_pred EEEECCCCCCCCCCCCEE--EEEEEEEEECCEEECCEEEEEECCCCCCCHHHHHHHCCCHHHHCCCCCHHHHHHHHHHHC T ss_conf 899760698898899837--999999999999924478999897898998899780968589835975899999998635 Q ss_pred HCCCCCEEECCCCHHHHHHHHHH---HCCC-----CCHHHHHHHHHHHHHHCCCHHHHHHHHHHHCCCCCCCCEECCCCC Q ss_conf 32364023010000168886542---0000-----000457898865211000000887776542002467520036565 Q gi|254780636|r 71 VDEKREKIFHYGRFDIAVLFYTF---GVRV-----RPVFCTKIASRLTRTYTNQHGLKDNLKELLGINISKAQQSSDWSA 142 (207) Q Consensus 71 ~d~~i~KV~Hn~~~D~~~L~~~~---gi~~-----~~i~DT~ias~l~~~~~~~~~L~~L~~~~lg~~ldK~~q~SdW~~ 142 (207) T Consensus 80 ~~~--~lVaHN~~FD~~fL~~~~~r~~~~~~~~~~~~~~Dtl~l~r~~~p-~~~~~L~~l~~~-~gi~~~---------- 145 (167) T cd06131 80 RGA--ELVIHNASFDVGFLNAELSLLGLGKKIIDFCRVIDTLALARKKFP-GKPNSLDALCKR-FGIDNS---------- 145 (167) T ss_pred CCC--EEEEECHHHHHHHHHHHHHHHCCCCCCCCCCCCCCHHHHHHHHCC-CCCCCHHHHHHH-CCCCCC---------- T ss_conf 699--999837187899999999981899777765541139999999849-998889999987-697999---------- Q ss_pred CCCCHHHHHHHHHHHHHHHHHHHHH Q ss_conf 4432368999986459999999999 Q gi|254780636|r 143 DDLSDEQLQYAASDVVHLHALRLQF 167 (207) Q Consensus 143 rpLs~~Qi~YAA~Dv~~l~~L~~~l 167 (207) T Consensus 146 ----~~~~H~Al~Da~~ta~vf~~l 166 (167) T cd06131 146 ----HRTLHGALLDAELLAEVYLEL 166 (167) T ss_pred ----CCCCCCHHHHHHHHHHHHHHH T ss_conf ----998758899999999999976

HHsearch alignment for GI: 254780636 and conserved domain: cd06131