>cd06138 ExoI_N This subfamily is composed of the N-terminal domain of E. coli exonuclease I (ExoI) and similar proteins. ExoI is a monomeric enzyme that hydrolyzes single stranded DNA in the 3' to 5' direction. It plays a role in DNA recombination and repair. It primarily functions in repairing frameshift mutations. The N-terminal domain of ExoI is a DEDDh-type DnaQ-like 3'-5 exonuclease containing 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 ExoI structure is unique among DnaQ family enzymes in that there is a large distance between the two metal ions required for catalysis and the catalytic histidine is oriented away from the active site.

Probab=98.35 E-value=8.9e-06 Score=52.84 Aligned_cols=123 Identities=22% Similarity=0.153 Sum_probs=65.5 Q ss_pred EEEECCCCCCCCCCCEEEEEEEEE----CC----CCE-EEECCCCCCCC-------------------------CHHHHH Q ss_conf 799717778985445079999841----89----428-99746577857-------------------------067767 Q gi|254780636|r 23 IAVDTETLGLMPRRDRLCIVQLSP----GD----GTV-DIIRIAAGQKN-------------------------APNLVG 68 (207) Q Consensus 23 iaiDtEt~~l~~~~~~l~LiQl~~----~~----~~~-~l~~~~~~~~~-------------------------~~~L~~ 68 (207) T Consensus 1 i~fD~ETTGl~~~~d~I--iqiaai~~d~~~~~~~~~~~~i~p~~~~~p~p~a~~v~git~~~~~~~~~s~~e~~~~i~~ 78 (183) T cd06138 1 LFYDYETFGLNPSFDQI--LQFAAIRTDENFNEIEPFNIFCRLPPDVLPSPEALIVTGITPQQLLKEGLSEYEFIAKIHR 78 (183) T ss_pred CEEEECCCCCCCCCCCE--EEEEEEEECCCCCCCCEEEEEECCCCCCCCCHHHHHHCCCCHHHHHHCCCCHHHHHHHHHH T ss_conf 98970389979998760--6999999989987864468874048999988479987188999975318877899999999 Q ss_pred HHHCCCCCEEECC-CCHHHHHHHHHH---HCCCC-------C-HHHHH---HHHHHHHHH----------CCCHHHHHHH Q ss_conf 7732364023010-000168886542---00000-------0-04578---988652110----------0000088777 Q gi|254780636|r 69 MLVDEKREKIFHY-GRFDIAVLFYTF---GVRVR-------P-VFCTK---IASRLTRTY----------TNQHGLKDNL 123 (207) Q Consensus 69 ll~d~~i~KV~Hn-~~~D~~~L~~~~---gi~~~-------~-i~DT~---ias~l~~~~----------~~~~~L~~L~ 123 (207) T Consensus 79 ~~~~~~~i~vg~N~~~FD~~fL~~~~~r~~~~p~~~~~~~~~~~~D~l~~~r~~~~~~p~~i~~~~~~~g~~s~kL~~l~ 158 (183) T cd06138 79 LFNTPGTCIVGYNNIRFDDEFLRFAFYRNLYDPYTWEWKNGNSRWDLLDVVRAYYALRPDGIVWPKNDDGKPSFKLEDLA 158 (183) T ss_pred HHCCCCCEEEEECCHHHHHHHHHHHHHHHCCCCHHHHHCCCCCCCCHHHHHHHHHHHCCCCCCCCCCCCCCCCCCHHHHH T ss_conf 86169977998453556899999999982787156675278712307889999999782014476556897411299999 Q ss_pred HHHHCCCCCCCCEECCCCCCCCCHHHHHHHHHHHHHHHHHH Q ss_conf 65420024675200365654432368999986459999999 Q gi|254780636|r 124 KELLGINISKAQQSSDWSADDLSDEQLQYAASDVVHLHALR 164 (207) Q Consensus 124 ~~~lg~~ldK~~q~SdW~~rpLs~~Qi~YAA~Dv~~l~~L~ 164 (207) T Consensus 159 ~~-~gi~~~----------------~aH~Al~Dv~aT~~l~ 182 (183) T cd06138 159 QA-NGIEHS----------------NAHDALSDVEATIALA 182 (183) T ss_pred HH-CCCCCC----------------CCCCCHHHHHHHHHHH T ss_conf 98-499998----------------8868289999999986

HHsearch alignment for GI: 254780636 and conserved domain: cd06138