HHsearch alignment for GI: 254781048 and conserved domain: TIGR00978
>TIGR00978 asd_EA aspartate-semialdehyde dehydrogenase; InterPro: IPR005676 Bacteria, plants and fungi metabolise aspartic acid to produce four amino acids - lysine, threonine, methionine and isoleucine - in a series of reactions known as the aspartate pathway. Additionally, several important metabolic intermediates are produced by these reactions, such as diaminopimelic acid, an essential component of bacterial cell wall biosynthesis, and dipicolinic acid, which is involved in sporulation in Gram-positive bacteria. Members of the animal kingdom do not posses this pathway and must therefore acquire these essential amino acids through their diet. Research into improving the metabolic flux through this pathway has the potential to increase the yield of the essential amino acids in important crops, thus improving their nutritional value. Additionally, since the enzymes are not present in animals, inhibitors of them are promising targets for the development of novel antibiotics and herbicides. For more information see . Aspartate-semialdehyde dehydrogenase, the second enzyme in the aspartate pathway, converts aspartyl phosphate to aspartate-semialdehyde, the branch point intermediate between the lysine and threonine/methionine pathways. Based on sequence alignments, the aspartate-semialdehyde dehydrogenase family appears to have two distinct subgroups, one found in most bacteria (Gram-positve and Gram-negative), while the other is found primarily in organisms lacking peptidoglycan (archaea,fungi and some bacteria). Most studies have been performed on enzymes isolated from Gram-negative bacteria , , , . The N-terminal domain forms the active site and NADP-binding pocket, while C-terminal domain is primarily involved in hydrophobic intersubunit contacts. The catalytic mechanism involves the formation of a covalent thioester acyl-enzyme intermediate mediated through nucleophilic attack by an active site cysteine residue on the substrate aspartyl phosphate. Release of inorganic phosphate is followed by hydride transfer from NADPH to yield the product. The recently described archaeal structure suggests that the two subgroups of aspartate semi-aldehyde dehydrogenase share similar structures and have an identical catalytic mechanism, despite their relatively low sequence identity . Unlike the bacterial enzymes, the archaeal enzyme utilised both NAD and NADP as cofactor. This entry represents the subgroup of aspartate dehydrogenases found primarily in organisms lacking peptidoglycan. In addition to its role in aspartate metabolism, the enzyme from Sulfolobus solfataricus has been shown recently to exhibit RNase activity, suggesting that these enzymes may perform additional cellular functions .; GO: 0004073 aspartate-semialdehyde dehydrogenase activity, 0009086 methionine biosynthetic process, 0009088 threonine biosynthetic process.
Probab=94.31 E-value=0.35 Score=27.74 Aligned_cols=224 Identities=20% Similarity=0.271 Sum_probs=111.5
Q ss_pred EEEEECC-CCHHHHHHHHHHHCC-C---CEEEEEECCCCCHHHHHHHH---HHH-CCCCCCCCEEEECC-C--HHHHCCC
Q ss_conf 2899889-813689999999579-9---86999965788128988307---620-54468875685269-7--4883789
Q gi|254781048|r 5 KIALIGS-GMIGGTLAHLAVLKK-L---GDVVLLDIVDGMPRGKALDI---AES-SPVEGFGAQLCGTS-D--YSDIAEA 72 (320)
Q Consensus 5 KV~IIGa-G~VG~~~a~~~~~~~-l---~ei~L~D~~~~~~~g~~~Dl---~~~-~~~~~~~~~v~~~~-d--~~~l~~a 72 (320)
T Consensus 2 ~VavLGaTG~VGq~f~~lL~~HPr~Fe~~~v~AS~~saGk~Yge~~~W~~~~~g~~Pe~~~dl~i~~~~p~ri~~d~~dV 81 (358)
T TIGR00978 2 RVAVLGATGLVGQKFVKLLEKHPRYFELAKVVASERSAGKRYGEVVKWREILSGDIPEEVRDLEIVETEPVRIAEDHKDV 81 (358)
T ss_pred EEEEEECCCHHHHHHHHHHHHCCCEEEEEEEEECCCCCCCCHHHHHHHCCCCCCCCCHHHCCCEEECCCCCEEEECCCCC
T ss_conf 68997065546899999975269812288988368655767445430121236858432347654134743356617982
Q ss_pred CEEEEECCCCCCC-------------------CCCHHH------HHHHHHHHHHHHHHHHHHCCCCCCEEEECCCCHHHH
Q ss_conf 7899955666676-------------------557467------899889999999976541266740887148420789
Q gi|254781048|r 73 DVCIVTAGIPRKP-------------------SMSRDD------LLADNLKAIEKVGAGIRKYAPNSFVICITNPLDAMV 127 (320)
Q Consensus 73 DivVitag~~~~~-------------------g~~R~d------ll~~N~~i~~~i~~~i~~~~p~~i~ivvtNPvDv~~ 127 (320)
T Consensus 82 D~vfSA--Lp~~~A~~~E~~la~~G~~VfSNAs~~RmdpdVPli~PEVN~~hL~l~~~Q~~RrgW~G--~ivtNPNC~-- 155 (358)
T TIGR00978 82 DIVFSA--LPSEVAEEVEPKLAEEGIIVFSNASAHRMDPDVPLIVPEVNSDHLELLKVQKERRGWKG--FIVTNPNCT-- 155 (358)
T ss_pred EEEEEC--CCHHHHHHHHHHHHHCCCEEEECCCCCCCCCCCCEEECCCCHHHHHHHHHCCCCCCCCC--EEEECCHHH--
T ss_conf 699814--99799999999998569889876847788888677833356147999985400168861--799576167--
Q ss_pred HHHHHHCCCCHHHHHHHCCCHHHHHHHHHHHHHCCCCCCCCEEEEECCCCCEEEEECCCCCCCCCHHHHHHHC-CC-CCH
Q ss_conf 9998844998656110005256899999999971987335505675078852465102354477015543001-58-787
Q gi|254781048|r 128 WALQKFSGLPSHMVVGMAGILDSARFRYFLAQEFGVSVESVTALVLGSHGDSMVPMLRYATVSGIPVSDLVKL-GW-TTQ 205 (320)
Q Consensus 128 ~~~~~~sg~~~~rViG~Gt~LDs~R~~~~ia~~l~v~~~~V~~~ViGeHGds~vp~~S~~~v~g~p~~~~~~~-~~-~~~ 205 (320)
T Consensus 156 -------------t~~lTl~LkPl~------d~~~~--~~V~v~Tm--------QAvSGAGY~GVp~~~I~dN~iP~I~G 206 (358)
T TIGR00978 156 -------------TAGLTLALKPLI------DAFGI--KKVIVTTM--------QAVSGAGYPGVPSMDILDNVIPHIGG 206 (358)
T ss_pred -------------HHHHHHHHHHHH------HCCCC--CEEEEEEE--------CCHHCCCCCCCCHHHHHCCCCCCCCC
T ss_conf -------------887761013464------30584--56999872--------00014888887545553361655063
Q ss_pred HHHHHHHHHHHCCHHHHHHHH-CCCCCCCCCHHHHHHHHHHHHCCCCEEEEEEEEECCCCCCCCEEEEEEEEECCCCCEE
Q ss_conf 679999845510158888751-5765432203232344554528897499999997364475634788769997872288
Q gi|254781048|r 206 EKIDQIVKRTREGGAEIVGLL-RSGSAYYAPASSAIAIAESYLKNKKNLLPCAAHLSGQYGVEGFYVGVPVVIGHKGVEK 284 (320)
Q Consensus 206 ~~~~~l~~~v~~~g~~ii~~~-~kg~t~~~~a~a~~~ii~aIl~~~~~v~~~s~~~~g~yg~~~v~~s~P~vig~~Gi~~ 284 (320)
T Consensus 207 EE-~KIe~E~~-------KilsGk-------------------l~~g~~~PA~~~------~~at~~RVPV~~GHt~~v~ 253 (358)
T TIGR00978 207 EE-EKIERETL-------KILSGK-------------------LENGKIEPAEFE------VSATTTRVPVLDGHTESVH 253 (358)
T ss_pred HH-HHHHHHHH-------HHHCCC-------------------CCCCEEEEECCE------EEEEEEECCCCCCCEEEEE
T ss_conf 35-89876213-------333440-------------------038846420440------6899874441116469999
Q ss_pred EEC-CCCCHHHHH
Q ss_conf 847-999889999
Q gi|254781048|r 285 IVE-LNLSFDEKD 296 (320)
Q Consensus 285 i~~-l~Ls~~E~~ 296 (320)
T Consensus 254 v~~~~~~d~~EI~ 266 (358)
T TIGR00978 254 VEFDKKFDIEEIR 266 (358)
T ss_pred EEECCCCCHHHHH
T ss_conf 9866877989999