>cd04677 Nudix_Hydrolase_18 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=97.98 E-value=5.5e-05 Score=55.61 Aligned_cols=105 Identities=18% Similarity=0.181 Sum_probs=61.9 Q ss_pred EEEEEEEEECCCEEEEEECCCCHHHHCCCCCCCCCCCCCCCHHHHHHCCCCCCCCEECC--CEEEEEEEE---------- Q ss_conf 23200034137605776457201320474421111346721588863010100002137--358998315---------- Q gi|254780479|r 239 TGAVFIAITNDNRILLRKRTNTRLLEGMDELPGSAWSSTKDGNIDTHSAPFTANWILCN--TITHTFTHF---------- 306 (356) Q Consensus 239 ~~~~~vii~~~~kiLL~KRp~~gll~GLwEFP~~e~~~~~~~~~~~~~~~~~~~~~~l~--~ikH~fTH~---------- 306 (356) T Consensus 8 ~g~~~vv~~~~g~vLL~~r~~~----g~W~lPGG~ve~gEt~~~aa~RE~~EEtGi~~~~~~~~~~~~~~~~~~~~~~~~ 83 (132) T cd04677 8 VGAGVILLNEQGEVLLQKRSDT----GDWGLPGGAMELGESLEETARRELKEETGLEVEELELLGVYSGKEFYVKPNGDD 83 (132) T ss_pred EEEEEEEEECCCEEEEEEECCC----CCEECCEEEECCCCCHHHHHHHHHHHHHCCEEEEEEEEEEECCCEEEECCCCCC T ss_conf 5799999989998999998899----949898427669979999999999998695535247999977864554489984 Q ss_pred --EEEEEEEEEECC------CCCCCCCCEEECHHHHHHCCCCHHHHHHHH Q ss_conf --999999999807------767667813322788874799878999998 Q gi|254780479|r 307 --TLTLFVWKTIVP------QIVIIPDSTWHDAQNLANAALPTVMKKALS 348 (356) Q Consensus 307 --~L~i~v~~~~~~------~~~~~~~~~Wv~~~el~~~~LPs~~kKIL~ 348 (356) T Consensus 84 ~~~~~~~~~~~~~~~~~~~~~~~E~~e~~Wf~~delp~l~~p~-~r~~ie 132 (132) T cd04677 84 EQYIVTLYYVTKVFGGKLVPDGDETLELKFFSLDELPELINPQ-HKEMLQ 132 (132) T ss_pred EEEEEEEEEEEEECCCCCCCCCCCEEEEEEECHHHCCCCCCHH-HHHHCC T ss_conf 7999999999862587567999701589998299983448922-575609

HHsearch alignment for GI: 254780479 and conserved domain: cd04677