>pfam01612 3_5_exonuc 3'-5' exonuclease. This domain is responsible for the 3'-5' exonuclease proofreading activity of E. coli DNA polymerase I (polI) and other enzymes, it catalyses the hydrolysis of unpaired or mismatched nucleotides. This domain consists of the amino-terminal half of the Klenow fragment in E. coli polI it is also found in the Werner syndrome helicase (WRN), focus forming activity 1 protein (FFA-1) and ribonuclease D (RNase D). Werner syndrome is a human genetic disorder causing premature aging; the WRN protein has helicase activity in the 3'-5' direction. The FFA-1 protein is required for formation of a replication foci and also has helicase activity; it is a homologue of the WRN protein. RNase D is a 3'-5' exonuclease involved in tRNA processing. Also found in this family is the autoantigen PM/Scl thought to be involved in polymyositis-scleroderma overlap syndrome.

Probab=98.97 E-value=1.1e-09 Score=80.53 Aligned_cols=133 Identities=19% Similarity=0.270 Sum_probs=84.2 Q ss_pred CEEEEECCCCCCCCCCCEEEEEEEEEEECCEECCCEEEEEECCCCCCCCHHHEEECCCCCCCCCCCCCCCHHHHHHHHHH Q ss_conf 58999846788888888899999999999988031379898588822886572420210123224852100234477753 Q gi|254780818|r 8 RKIVFDIETTGLDSKNDRIIEIGAVELLDYSKTNRTFQVFLCPNGRKNSPEALKLHGITDEFLKDKPSFSSIFSEFWDFF 87 (245) Q Consensus 8 r~iv~D~ETTGl~~~~d~Iieigav~i~~~~~~~~~f~~~i~P~~~~i~~~~~~ihGIt~~~l~~~p~f~ev~~~f~~fi 87 (245) T Consensus 21 ~~ia~DtEt~~~~~~~~~~~-~~llq~~~----~~~~y-li~~~--~~---------------------~~~~~~L~~ll 71 (172) T pfam01612 21 KVVAVDTETTSLDTYSYTLV-GCLIQIST----GEGAY-IIDPL--AL---------------------GDDLEGLKRLL 71 (172) T ss_pred CCEEEEEECCCCCCCCCCCC-EEEEEEEC----CCCCE-EEECC--CC---------------------HHHHHHHHHHH T ss_conf 90899806289886761343-36999967----98607-76434--75---------------------66799999997 Q ss_pred HCCCCEEEEECCCCCCCEEEECHHCCCCCCCCCCHHCCCHHCCCCCCCCCCCCHHHHHHH-HCCCCCC------------ Q ss_conf 002320231023224311210000011222210000110000000177642223789997-1875455------------ Q gi|254780818|r 88 NEQNAEWIAHNAKFDVGFINAELQRINKDPLDPSRIIDTLSIARRKHPSSRNDLNSLCKR-YGITISH------------ 154 (245) Q Consensus 88 ~~~~~~lVaHNa~FD~~fL~~el~r~~~~~~~~~~~iDTl~lar~~~p~~~~~L~~l~~~-~~i~~~~------------ 154 (245) T Consensus 72 ~~~~i~Kvghn~k~D~~~L~~~---~~~~---~~~~~Dt~~a~~~l~~~~~~gL~~L~~~~lg~~~~K~~~~s~w~~rpL 145 (172) T pfam01612 72 EDPNITKVGHNAKFDLEVLARD---FGIK---LENLFDTMLAAYLLGYPRSHSLDDLAEKYLGVELDKSEQCADWRARPL 145 (172) T ss_pred CCCCCCEEEEEHHHHHHHHHHH---CCCC---CCCCHHHHHHHHHCCCCCCCCHHHHHHHHCCCCCCHHHEECCCCCCCC T ss_conf 5999879997589999999885---4766---687327899998819964356999999980987874415667887898 Q ss_pred --CCCCCCHHHHHHHHHHHHHHH Q ss_conf --566640269999999999997 Q gi|254780818|r 155 --RSKHGALLDSHLLSDVYIKMM 175 (245) Q Consensus 155 --r~~H~Al~Da~~~a~v~~~ll 175 (245) T Consensus 146 ~~~qi~YAa~Da~~~~~l~~~l~ 168 (172) T pfam01612 146 SEEQLRYAAEDADYLLRLYDKLR 168 (172) T ss_pred CHHHHHHHHHHHHHHHHHHHHHH T ss_conf 29999999999999999999999

HHsearch alignment for GI: 254780818 and conserved domain: pfam01612