>cd06145 REX1_like This subfamily is composed of RNA exonuclease 1 (REX1 or Rex1p), REX3 (or Rex3p), and similar eukaryotic proteins. In yeast, REX1 and REX3 are required for 5S rRNA and MRP (mitochondrial RNA processing) RNA maturation, respectively. They are DEDDh-type DnaQ-like 3'-5' exonucleases 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. REX1 is the major exonuclease responsible for pre-tRNA trail trimming and may also be involved in nuclear CCA turnover. REX proteins function in the processing and maturation of many RNA species, similar to the function of E.coli RNase T.

Probab=94.75 E-value=0.17 Score=28.08 Aligned_cols=58 Identities=29% Similarity=0.304 Sum_probs=36.2 Q ss_pred HHHHHHCCCCCEEEEEEHHHHHHHHHHHCCCCCCCCCEEEHHHHHHHH-CCC--CCHHHHHHH-HCCCC Q ss_conf 999986488981998630775999998629987865045458899985-889--997899998-08898 Q gi|254780127|r 56 DLLQYLRDETVMCVAHNSLFERILFKKTLGIDIPSKRWICTSVLARTN-GLP--SSLKNACLA-LNFSE 120 (675) Q Consensus 56 ~l~~~L~~~~~~kv~HNa~FD~~vL~~~lGi~i~~~~~~DTmi~A~~l-~~p--~sL~~la~~-lgl~~ 120 (675) T Consensus 68 ~l~~li-~~~~IlVGH~L~nDL~aL~----i~H~--~v~DTa~l~~~~~~~~~~~sLk~L~~~~L~~~I 129 (150) T cd06145 68 KLLSLI-SPDTILVGHSLENDLKALK----LIHP--RVIDTAILFPHPRGPPYKPSLKNLAKKYLGRDI 129 (150) T ss_pred HHHHHC-CCCCEEEECCCCCCHHHHH----CCCC--CEEEHHHHHHHCCCCCCCHHHHHHHHHHHCHHH T ss_conf 999875-9998899626434777761----5587--615716621103799989789999999828774

HHsearch alignment for GI: 254780127 and conserved domain: cd06145