>cd04680 Nudix_Hydrolase_21 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=99.89 E-value=1.5e-22 Score=151.78 Aligned_cols=112 Identities=21% Similarity=0.211 Sum_probs=75.5 Q ss_pred CEEEEEEECCCCCEEEEEECCCCCCCCCCCCCCCCCCCCCCCCHHHHHHHHHHHHHCCCCCCCCCCCCCCEEECCCCCCC Q ss_conf 60699998489839999926887766687220121150788888899999999983755222220136612411632220 Q gi|254780557|r 4 RGVGILILNQDDLVWVGRRCFHDNNKHLSLWQMPQGGINPQEDPLDAAYRELYEETGIKSISLLGQGDSYIQYDFPAHCI 83 (160) Q Consensus 4 ~~V~vvi~n~~~~iLl~kR~~~~~~~~~g~W~~PgG~ve~gEt~~~Aa~REl~EEtGi~~~~~~~~~~~~~~~~~~~~~~ 83 (160) T Consensus 1 vgv~~vv~~~~g~vLL~rr~~------~~~W~lPGG~ve~gEs~~~aa~RE~~EEtGl~v~~~~~l~~---~~------~ 65 (120) T cd04680 1 LGARAVVTDADGRVLLVRHTY------GPGWYLPGGGLERGETFAEAARRELLEELGIRLAVVAELLG---VY------Y 65 (120) T ss_pred CEEEEEEECCCCEEEEEEECC------CCEEECCCCCCCCCCCHHHHHHHHHHHHHCCEEEEEEEEEE---EE------E T ss_conf 979999992999099998679------99199995471699899999999999986975551547999---98------2 Q ss_pred CCCCCCCCCCEEEEEEECCCCCCEECCCCCCCCCCCCCEEEECCHHHHHHCCHHC Q ss_conf 0001123443379999804754301057888888860037603789976300001 Q gi|254780557|r 84 QENGYVGQMQKWFAFRFQGLTSEICVDRTAYGYESEFDAWTWVSLWDTPNIVVDF 138 (160) Q Consensus 84 ~~~~~~~~~~~~~~~~~~~~~~~i~~~~~~~~~~~E~~~~~Wv~~~el~~~i~~f 138 (160) T Consensus 66 ~~~~~~~~~~~~f~~~~~~--------~~~~~~~~E~~e~~Wf~~d~LPe~l~p~ 112 (120) T cd04680 66 HSASGSWDHVIVFRARADT--------QPVIRPSHEISEARFFPPDALPEPTTPA 112 (120) T ss_pred CCCCCCCEEEEEEEEEECC--------CCCCCCCHHHHCEEEECHHHCCCCCCHH T ss_conf 5899975399999998248--------8867998367411398888988878977

HHsearch alignment for GI: 254780557 and conserved domain: cd04680