>cd04690 Nudix_Hydrolase_31 Members of the Nudix hydrolase superfamily catalyze the hydrolysis of NUcleoside DIphosphates linked to other moieties, X. Enzymes belonging to this superfamily require a divalent cation, such as Mg2+ or Mn2+, for their activity and contain a highly conserved 23-residue nudix motif (GX5EX7REUXEEXGU, where U = I, L or V), which functions as a metal binding and catalytic site. Substrates of nudix hydrolases include intact and oxidatively damaged nucleoside triphosphates, dinucleoside polyphosphates, nucleotide-sugars and dinucleotide enzymes. These substrates are metabolites or cell signaling molecules that require regulation during different stages of the cell cycle or during periods of stress. In general, the role of the nudix hydrolase is to sanitize the nucleotide pools and to maintain cell viability, thereby serving as surveillance & "house-cleaning" enzymes. Substrate specificity is used to define families within the superfamily. Differences in substrate

Probab=99.94 E-value=3.6e-26 Score=171.27 Aligned_cols=112 Identities=32% Similarity=0.487 Sum_probs=92.7 Q ss_pred EEEEEEEECCCEEEEEEECCCCCCCCCEECCCCCCCCCCCHHHHHHHHHHHHHCCCCCCCCEEEEEEEE---CCCCCCEE Q ss_conf 999999935986999991789888983822573101787488999988887626520244202556652---05788606 Q gi|254780325|r 12 VVACAVFEPGGKVLLSCRPKDKSHGEFWEFPGGKIEDGETPEEALTRELFEELAIVVKPFSLVPLTFIS---HPYEKFHL 88 (141) Q Consensus 12 vv~~~ii~~~~~iLl~~R~~~~~~~g~W~lPGG~ve~gEs~~~a~~REv~EEtgi~~~~~~~~~~~~~~---~~~~~~~~ 88 (141) T Consensus 2 v~~a~v~~~~grvLl~rr~~----~~~W~lPGG~vE~gEt~~~a~~REl~EE~Gl~v~~~~l~~~~~~~~~~~~~~~~~~ 77 (118) T cd04690 2 IAAALILVRDGRVLLVRKRG----TDVFYLPGGKIEAGETPLQALIRELSEELGLDLDPDSLEYLGTFRAPAANEPGVDV 77 (118) T ss_pred EEEEEEEECCCEEEEEEECC----CCEEECCCCCCCCCCCHHHHHHHHHHHHHCCEEECCEEEEEEEEEECCCCCCCEEE T ss_conf 89999998999899999779----99498996376599799999999998975949860207998999721667999899 Q ss_pred EEEEEEEEEECCEECC-CHHHEEEECCHHHHCCCCCCCCCH Q ss_conf 9999999975483768-823315702778832488973698 Q gi|254780325|r 89 LMPFFVCHCFEGIPQS-CEGQQLQWVALDDLQNYSMLPADL 128 (141) Q Consensus 89 ~~~~~~~~~~~~~~~~-~E~~~~~Wi~~~el~~~~~~~~~~ 128 (141) T Consensus 78 ~~~~~~~~-~~g~~~~~~E~~e~~Wv~~~el~~~~laP~~r 117 (118) T cd04690 78 RATVYVAE-LTGEPVPAAEIEEIRWVDYDDPADDRLAPLLR 117 (118) T ss_pred EEEEEEEE-EECCCCCCCCCCCEEEECHHHCCCCCCCCCCC T ss_conf 99999999-81884578631002995798976899898667

HHsearch alignment for GI: 254780325 and conserved domain: cd04690