>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=99.91 E-value=3e-24 Score=195.43 Aligned_cols=170 Identities=24% Similarity=0.384 Sum_probs=141.2 Q ss_pred CEEECCHHHHHHHHHHHHHCCCCCCCCCCCCCCCCCCCCCCCEEECCCCCCCCCCCCCCEECCCCCCCCCCCCCCCCCHH Q ss_conf 03547999999999999866852323322243311001244201025776654434550231374433345650017889 Q gi|254780277|r 368 YTKIVNTKDIQQWVQKLETIGSASFKIITDTMDAFHSKPIAIAISTLDQKDDTSFKVETIFIDLSVHTSQDSTGKNTLTK 447 (976) Q Consensus 368 y~~I~~~~~L~~li~~L~~~~~ia~DtETt~ld~~~~~ivGisls~~~~~~~~~~~~~~~yip~~~~~~~d~~~~~~~~~ 447 (976) T Consensus 1 y~~I~~~~~l~~~~~~l~~~~~ia~DtEt~~~~~~~~~~~~~llq~~~~~--------~~yli~~~~~-----------~ 61 (172) T pfam01612 1 YRIVTTEDELEDLIEELLNAKVVAVDTETTSLDTYSYTLVGCLIQISTGE--------GAYIIDPLAL-----------G 61 (172) T ss_pred CEEECCHHHHHHHHHHHHCCCCEEEEEECCCCCCCCCCCCEEEEEEECCC--------CCEEEECCCC-----------H T ss_conf 97988899999999999409908998062898867613433699996798--------6077643475-----------6 Q ss_pred HHHHHHHHHHCCCCCHHHHCCCCHHHHHHHH-CCCCCCCCCCHHHHHHHHCCCCCCCCHHHHHHHHCCCCCCCCCCCCCC Q ss_conf 9997444420222100110032123788986-188666421002345543168766772466776224442233565432 Q gi|254780277|r 448 EILSYLKKFFENEHFLKIGHNIKYDKLVLHR-YGISMRGFEDIMLMSYVLDSGRSSHDIASIAQKWLSYTRKEILKSRKS 526 (976) Q Consensus 448 evl~~L~~lle~~~i~kIgHN~KfD~~~L~~-~GI~l~~i~DTmlaayLLdp~~~~~~L~~la~~yL~~~~~e~~~~~k~ 526 (976) T Consensus 62 ~~~~~L~~ll~~~~i~Kvghn~k~D~~~L~~~~~~~~~~~~Dt~~a~~~l~~~~-~~gL~~L~~~~lg~~~~K---~~~- 136 (172) T pfam01612 62 DDLEGLKRLLEDPNITKVGHNAKFDLEVLARDFGIKLENLFDTMLAAYLLGYPR-SHSLDDLAEKYLGVELDK---SEQ- 136 (172) T ss_pred HHHHHHHHHHCCCCCCEEEEEHHHHHHHHHHHCCCCCCCCHHHHHHHHHCCCCC-CCCHHHHHHHHCCCCCCH---HHE- T ss_conf 679999999759998799975899999998854766687327899998819964-356999999980987874---415- Q ss_pred CCCC-HHHCCHHHHHHHHHHHHHHHHHHHHHHHHHH Q ss_conf 2210-0000012333322211111245677632221 Q gi|254780277|r 527 SIPI-DKISDSQVQEHAIENSNVILQLWLLLRPKLI 561 (976) Q Consensus 527 ~~~~-~~i~~e~~~~Yaa~Da~~t~~L~~~l~~~L~ 561 (976) T Consensus 137 ~s~w~~rpL~~~qi~YAa~Da~~~~~l~~~l~~~l~ 172 (172) T pfam01612 137 CADWRARPLSEEQLRYAAEDADYLLRLYDKLRKELE 172 (172) T ss_pred ECCCCCCCCCHHHHHHHHHHHHHHHHHHHHHHHHHC T ss_conf 667887898299999999999999999999999749

HHsearch alignment for GI: 254780277 and conserved domain: pfam01612