>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=98.89 E-value=3.7e-09 Score=85.38 Aligned_cols=145 Identities=14% Similarity=0.230 Sum_probs=90.7 Q ss_pred CCCCCCCCCCCCCC-CCCCCCEEECCCCCCCCCCCCCCEECC----CC------CCCCCCCCCCCCCHHHHHHHHHHHHC Q ss_conf 23233222433110-012442010257766544345502313----74------43334565001788999974444202 Q gi|254780277|r 390 ASFKIITDTMDAFH-SKPIAIAISTLDQKDDTSFKVETIFID----LS------VHTSQDSTGKNTLTKEILSYLKKFFE 458 (976) Q Consensus 390 ia~DtETt~ld~~~-~~ivGisls~~~~~~~~~~~~~~~yip----~~------~~~~~d~~~~~~~~~evl~~L~~lle 458 (976) T Consensus 2 Vv~D~ETTGl~p~~~d~Iieigav~~~~~~~~~-~~~~~lv~P~~~i~~~~~~ihGIt~e~l~~~p~~~ev~~~f~~~l~ 80 (167) T cd06131 2 IVLDTETTGLDPREGHRIIEIGCVELINRRLTG-NTFHVYINPERDIPEEAFKVHGITDEFLADKPKFAEIADEFLDFIR 80 (167) T ss_pred EEEECCCCCCCCCCCCEEEEEEEEEEECCEEEC-CEEEEEECCCCCCCHHHHHHHCCCHHHHCCCCCHHHHHHHHHHHCC T ss_conf 899760698898899837999999999999924-4789998978989988997809685898359758999999986356 Q ss_pred CCCCHHHHCCCCHHHHHHH----HCCCCCC-----CCCCHHHHHHHHCCCCCCCCHHHHHHHHCCCCCCCCCCCCCCCCC Q ss_conf 2210011003212378898----6188666-----421002345543168766772466776224442233565432221 Q gi|254780277|r 459 NEHFLKIGHNIKYDKLVLH----RYGISMR-----GFEDIMLMSYVLDSGRSSHDIASIAQKWLSYTRKEILKSRKSSIP 529 (976) Q Consensus 459 ~~~i~kIgHN~KfD~~~L~----~~GI~l~-----~i~DTmlaayLLdp~~~~~~L~~la~~yL~~~~~e~~~~~k~~~~ 529 (976) T Consensus 81 ~~~--lVaHN~~FD~~fL~~~~~r~~~~~~~~~~~~~~Dtl~l~r~~~p~-~~~~L~~l~~~~-gi~~~----------- 145 (167) T cd06131 81 GAE--LVIHNASFDVGFLNAELSLLGLGKKIIDFCRVIDTLALARKKFPG-KPNSLDALCKRF-GIDNS----------- 145 (167) T ss_pred CCE--EEEECHHHHHHHHHHHHHHHCCCCCCCCCCCCCCHHHHHHHHCCC-CCCCHHHHHHHC-CCCCC----------- T ss_conf 999--998371878999999999818997777655411399999998499-988899999876-97999----------- Q ss_pred CHHHCCHHHHHHHHHHHHHHHHHHHHH Q ss_conf 000000123333222111112456776 Q gi|254780277|r 530 IDKISDSQVQEHAIENSNVILQLWLLL 556 (976) Q Consensus 530 ~~~i~~e~~~~Yaa~Da~~t~~L~~~l 556 (976) 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: 254780277 and conserved domain: cd06131