>cd01999 Argininosuccinate_Synthase Argininosuccinate synthase. The Argininosuccinate synthase is a urea cycle enzyme that catalyzes the penultimate step in arginine biosynthesis: the ATP-dependent ligation of citrulline to aspartate to form argininosuccinate, AMP and pyrophosphate . In humans, a defect in the AS gene causes citrullinemia, a genetic disease characterized by severe vomiting spells and mental retardation. AS is a homotetrameric enzyme of chains of about 400 amino-acid residues. An arginine seems to be important for the enzyme's catalytic mechanism. The sequences of AS from various prokaryotes, archaebacteria and eukaryotes show significant similarity

Probab=98.39 E-value=8e-06 Score=60.21 Aligned_cols=141 Identities=21% Similarity=0.175 Sum_probs=90.4 Q ss_pred EEEEECCCHHHHHHHHHHHHHHHHCCCCCEEEEEEEECCCCCCCHHHHHHHHHHHHHHCCC-CEEEEEEECCC------- Q ss_conf 9999669424899999999999864899729999996677987846899999999987189-88999975047------- Q gi|254780546|r 22 ILVAVSGGSDSMGLLIALHSVLSDRSFGKIKFSAISVDHCLRETAKDEVRYVSDVCSRLRI-AHSVVSWKNSK------- 93 (423) Q Consensus 22 i~vAvSGG~DS~aLl~ll~~~~~~~~~~~~~l~a~~vdHglr~~s~~e~~~v~~~~~~lgi-~~~~~~~~~~~------- 93 (423) T Consensus 1 VvLAySGGLDTSv~l~wL~e~----~--~~eVia~~~d~Gq-~--~e~~~~i~~kA~~~GA~~~~v~D~r~ef~~~~i~p 71 (385) T cd01999 1 VVLAYSGGLDTSVILKWLKEK----G--GYEVIAVTADVGQ-P--EEEIEAIEEKALKLGAKKHVVVDLREEFVEDYIFP 71 (385) T ss_pred CEEEECCCCHHHHHHHHHHHH----C--CCEEEEEEEECCC-C--HHHHHHHHHHHHHHCCCEEEEECHHHHHHHHHHHH T ss_conf 979977881799999999974----5--9849999998999-6--67778999999981997899961299999999999 Q ss_pred ----------CCCCCHHHHHHHHHHHHHHHCCCCCCCCHHHHHH--HHHHHHHHHHHHHCCCCCCCCCCCCCCCCCCCCC Q ss_conf ----------8778037888545555432001234420123456--6656689999862365444332235764100357 Q gi|254780546|r 94 ----------PQTGLMAAAREARYALISEHAKTINATLIMTAHT--FDDQLETVYMRSQRDYAEKGMGLSGMCDTILYDL 161 (423) Q Consensus 94 ----------~~~~~~~~ar~~r~~~~~~~~~~~~~~~l~~ah~--~dD~~Et~l~rl~r~sg~~g~~l~~~~~~~~~~~ 161 (423) T Consensus 72 ai~ana~Yeg~Y~L~tslaRplIak~~ve~A~~~ga~aiaHG~TGkGNDQvRFe~~--~~----------aL~------P 133 (385) T cd01999 72 AIQANALYEGTYPLGTALARPLIAKALVEVAKEEGADAVAHGCTGKGNDQVRFELA--FY----------ALN------P 133 (385) T ss_pred HHHHCCCCCCCEECCCCHHHHHHHHHHHHHHHHHCCEEEEECCCCCCCCHHHHHHH--HH----------HHC------C T ss_conf 99608643375321350157899999999999809849974566688840689999--99----------859------9 Q ss_pred CCEEECCH---HCCCHHHHHHHHHHHCCCCC Q ss_conf 96871012---10428999998998189320 Q gi|254780546|r 162 NLWISRPF---LRCRREDIRSFLLQRNISWC 189 (423) Q Consensus 162 ~~~i~RPL---L~~~r~~l~~~~~~~~i~wv 189 (423) T Consensus 134 ~l~iiAP~Rd~~~~sR~~~i~ya~~~gi~v~ 164 (385) T cd01999 134 DLKIIAPWRDWEFLSREEEIEYAEEHGIPVP 164 (385) T ss_pred CCEEEEEEECCCCCCHHHHHHHHHHCCCCCC T ss_conf 9758514731444888999999998599988

HHsearch alignment for GI: 254780546 and conserved domain: cd01999