>cd04679 Nudix_Hydrolase_20 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=3.3e-26 Score=171.52 Aligned_cols=118 Identities=26% Similarity=0.412 Sum_probs=100.0 Q ss_pred EEEEEEEECCCEEEEEEECCCCCCCCCEECCCCCCCCCCCHHHHHHHHHHHHHCCCCCCCCEEEEEEEECCCCCCEEEEE Q ss_conf 99999993598699999178988898382257310178748899998888762652024420255665205788606999 Q gi|254780325|r 12 VVACAVFEPGGKVLLSCRPKDKSHGEFWEFPGGKIEDGETPEEALTRELFEELAIVVKPFSLVPLTFISHPYEKFHLLMP 91 (141) Q Consensus 12 vv~~~ii~~~~~iLl~~R~~~~~~~g~W~lPGG~ve~gEs~~~a~~REv~EEtgi~~~~~~~~~~~~~~~~~~~~~~~~~ 91 (141) T Consensus 4 ~v~avv~~~~g~vLL~~R~~~~-~~g~W~lPGG~vE~gEt~~~aa~REv~EEtGl~v~~~~l~~~~~~~~~~~~~~~~~~ 82 (125) T cd04679 4 GCGAAILRDDGKLLLVKRLRAP-EAGHWGIPGGKVDWMEAVEDAVVREIEEETGLSIHSTRLLCVVDHIIEEPPQHWVAP 82 (125) T ss_pred EEEEEEEECCCEEEEEEECCCC-CCCEEECCEEECCCCCCHHHHHHHHHHHHHCCEEEEEEEEEEECCCCCCCCCEEEEE T ss_conf 6999999779989999938999-999793988305899899999999999987978585379999856435899659999 Q ss_pred EEEEEEECCEECC---CHHHEEEECCHHHHCCCCCCCCCHHHH Q ss_conf 9999975483768---823315702778832488973698999 Q gi|254780325|r 92 FFVCHCFEGIPQS---CEGQQLQWVALDDLQNYSMLPADLSLI 131 (141) Q Consensus 92 ~~~~~~~~~~~~~---~E~~~~~Wi~~~el~~~~~~~~~~~ii 131 (141) T Consensus 83 ~f~~~~~~g~~~~~~~~e~~e~~Wf~~d~LP~-~l~~~~r~~i 124 (125) T cd04679 83 VYLAENFSGEPRLMEPDKLLELGWFALDALPQ-PLTRATRDAV 124 (125) T ss_pred EEEEEECCCEEECCCCCEEEEEEEECHHHCCC-CCCHHHHHHH T ss_conf 99999738878228998146887898889888-6598899974

HHsearch alignment for GI: 254780325 and conserved domain: cd04679