>cd03427 MTH1 MutT homolog-1 (MTH1) is a member of the Nudix hydrolase superfamily. MTH1, the mammalian counterpart of MutT, hydrolyzes oxidized purine nucleoside triphosphates, such as 8-oxo-dGTP and 2-hydroxy-ATP, to monophosphates, thereby preventing the incorporation of such oxygen radicals during replication. This is an important step in the repair mechanism in genomic and mitochondrial DNA. Like other members of the Nudix family, it requires a divalent cation, such as Mg2+ or Mn2+, for activity, and contain the Nudix motif, a highly conserved 23-residue block (GX5EX7REUXEEXGU, where U = I, L or V), that functions as a metal binding and catalytic site. MTH1 is predominantly localized in the cytoplasm and mitochondria. Structurally, this enzyme adopts a similar fold to MutT despite low sequence similarity outside the conserved nudix motif. The most distinctive structural difference between MutT and MTH1 is the presence of a beta-hairpin, which is absent in MutT. This results in a m

Probab=99.97 E-value=3.6e-30 Score=194.35 Aligned_cols=126 Identities=33% Similarity=0.491 Sum_probs=111.0 Q ss_pred EEEEEEECCCEEEEEEECCCCCCCCCEECCCCCCCCCCCHHHHHHHHHHHHHCCCCCCCCEEEEEEEECCCCCCEEEEEE Q ss_conf 99999935986999991789888983822573101787488999988887626520244202556652057886069999 Q gi|254780325|r 13 VACAVFEPGGKVLLSCRPKDKSHGEFWEFPGGKIEDGETPEEALTRELFEELAIVVKPFSLVPLTFISHPYEKFHLLMPF 92 (141) Q Consensus 13 v~~~ii~~~~~iLl~~R~~~~~~~g~W~lPGG~ve~gEs~~~a~~REv~EEtgi~~~~~~~~~~~~~~~~~~~~~~~~~~ 92 (141) T Consensus 3 ~tl~ii~~~~kiLl~~R~~~~~-~G~W~~PGGkvE~gEt~~~a~~REl~EEtGl~v~~~~~~g~~~~~~~~~~~~~~~~~ 81 (137) T cd03427 3 TTLCFIKDPDKVLLLNRKKGPG-WGGWNGPGGKVEPGETPEECAIRELKEETGLTIDNLKLVGIIKFPFPGEEERYGVFV 81 (137) T ss_pred EEEEEEEECCEEEEEEECCCCC-CCEEECCEEECCCCCCHHHHHHHHHHHHHCEEEEEEEEEEEEEEEECCCCEEEEEEE T ss_conf 8999999899999999699999-995979556567997999999999989869288713899999999279998999999 Q ss_pred EEEEEECCEECC-CHHHEEEECCHHHHCCCCCCCCCHHHHHHHHHHCC Q ss_conf 999975483768-82331570277883248897369899999987215 Q gi|254780325|r 93 FVCHCFEGIPQS-CEGQQLQWVALDDLQNYSMLPADLSLISFLRKHAL 139 (141) Q Consensus 93 ~~~~~~~~~~~~-~E~~~~~Wi~~~el~~~~~~~~~~~ii~~l~~~~~ 139 (141) T Consensus 82 f~~~~~~G~~~~~~~e~~l~Wv~~~el~~l~~~p~d~~~l~~ll~~~~ 129 (137) T cd03427 82 FLATEFEGEPLKESEEGILDWFDIDDLPLLPMWPGDREWLPLMLEKNL 129 (137) T ss_pred EEEEEEEEEECCCCCCCEEEEEEHHHCCCCCCCCCHHHHHHHHHCCCC T ss_conf 999835247679883336899849897758998236899999977993

HHsearch alignment for GI: 254780325 and conserved domain: cd03427