HHsearch alignment for GI: 254780900 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=97.36 E-value=0.00069 Score=47.32 Aligned_cols=308 Identities=14% Similarity=0.142 Sum_probs=156.7
Q ss_pred EEEEEEC-CCHHHHHHHHHHHHHHHHHHHHCCCCEEEEEEEECCCCC--CCCC--------CCCCCHH-------CCCHH
Q ss_conf 6999982-566789999999998999999739965999998268520--0278--------8771022-------07888
Q gi|254780900|r 5 LKVGVAG-LGTVGSALIRSIQKREGRFKDLDQHSFVVSAISARDKNI--DRGI--------DCLRYEW-------FDDPL 66 (438)
Q Consensus 5 ikIgiiG-~G~VG~~~~~~l~~~~~~l~~~~g~~i~i~~i~~r~~~k--~~~~--------~~~~~~~-------~~d~~ 66 (438)
T Consensus 1 ~~VavLGaTG~VGq~f~~lL~~HPr--------~Fe~~~v~AS~~saGk~Yge~~~W~~~~~g~~Pe~~~dl~i~~~~p~ 72 (358)
T TIGR00978 1 VRVAVLGATGLVGQKFVKLLEKHPR--------YFELAKVVASERSAGKRYGEVVKWREILSGDIPEEVRDLEIVETEPV 72 (358)
T ss_pred CEEEEEECCCHHHHHHHHHHHHCCC--------EEEEEEEEECCCCCCCCHHHHHHHCCCCCCCCCHHHCCCEEECCCCC
T ss_conf 9689970655468999999752698--------12288988368655767445430121236858432347654134743
Q ss_pred HHHC-CCCCCEEEECCCCCCCCHHHHHHHHHHCCEEEEEECH-H-------HH--HHHHHHHHHHHH---HC----CCEE
Q ss_conf 9844-8899899986488885113578888632702885041-7-------78--876899998753---13----9669
Q gi|254780900|r 67 IMAG-EADIDVFVELIGGEDYPAYDAVRIALMRGCHVVTANK-A-------LI--ASHGKDLALLAQ---KN----NAIL 128 (438)
Q Consensus 67 ~li~-~~~IDvVVEliGg~~~pA~~~i~~AL~~GkhVVTANK-a-------ll--A~~g~eL~~lA~---~~----gv~l 128 (438)
T Consensus 73 ri~~d~~dVD~vfSAL--p~~~A~~~E~~la~~G~~VfS-NAs~~RmdpdVPli~PEVN~~hL~l~~~Q~~RrgW~G~iv 149 (358)
T TIGR00978 73 RIAEDHKDVDIVFSAL--PSEVAEEVEPKLAEEGIIVFS-NASAHRMDPDVPLIVPEVNSDHLELLKVQKERRGWKGFIV 149 (358)
T ss_pred EEEECCCCCEEEEECC--CHHHHHHHHHHHHHCCCEEEE-CCCCCCCCCCCCEEECCCCHHHHHHHHHCCCCCCCCCEEE
T ss_conf 3566179826998149--979999999999856988987-6847788888677833356147999985400168861799
Q ss_pred EEECCCCCHHHH-HHHHHHHHHCCCCEEEEEEECCCHHHHEEHHHC-CCCCHHHHHHHHHHCCCCCCCCCCCCCHHHHHH
Q ss_conf 960564530131-899987641286203433314200000000100-687788998878761761565322321178999
Q gi|254780900|r 129 NFEAAVAGGIPI-IRILKNYVEYDEINRVYGIINGTCNYILSHMNN-LGLSFQDCLEEARRQGYAEGDATFDINGVDSSH 206 (438)
Q Consensus 129 ~~easV~ggiPi-i~~l~~~l~~~~i~~i~GIlnGT~nyIL~~m~~-~g~~f~~al~~Aq~lGyaE~DP~~Di~G~Daa~ 206 (438)
T Consensus 150 tNPNC~t~~lTl~LkPl~d~~~~~~V~-------------v~TmQAvSGAGY~GV-------------p~---------- 193 (358)
T TIGR00978 150 TNPNCTTAGLTLALKPLIDAFGIKKVI-------------VTTMQAVSGAGYPGV-------------PS---------- 193 (358)
T ss_pred ECCHHHHHHHHHHHHHHHHCCCCCEEE-------------EEEECCHHCCCCCCC-------------CH----------
T ss_conf 576167887761013464305845699-------------987200014888887-------------54----------
Q ss_pred HHHHHHHHHHCCCCCCCCCHHHHHHHCCHHHHHHHHHCCCEEEEE-EEEEE---CCCCCEEEEEEEEEECCCCCCCCCCC
Q ss_conf 999999998188555310001223204767403478719858741-01331---36783569999864167730003665
Q gi|254780900|r 207 KIAILSAIAFGIDTSVEGVYCEGISNITLEDIRGAADFGYCIKFL-AMARR---KGKGIIRYVYPVLLKYDSVMALVDGI 282 (438)
Q Consensus 207 Kl~ILa~~~~g~~~~~~~v~~~gI~~i~~~di~~a~~~g~~ikli-~~~~~---~~~~i~~~V~P~li~~~~~la~v~g~ 282 (438)
T Consensus 194 -~~I~dN~i----------P-----~I~GEE~KIe~E---~~KilsGkl~~g~~~PA~~~~~at~~RVP------V~~GH 248 (358)
T TIGR00978 194 -MDILDNVI----------P-----HIGGEEEKIERE---TLKILSGKLENGKIEPAEFEVSATTTRVP------VLDGH 248 (358)
T ss_pred -HHHHCCCC----------C-----CCCCHHHHHHHH---HHHHHCCCCCCCEEEEECCEEEEEEEECC------CCCCC
T ss_conf -55533616----------5-----506335898762---13333440038846420440689987444------11164
Q ss_pred CCEEEEEEEEEEEEEEEECCCCCCCCHHHHHHHHHHHHHCCCCCCCCCCCCCCCCCCCCCCCCCHHHCCCCEEEEEEECC
Q ss_conf 41689831131005897268766610206889999997417777655666678310023443885344653279999248
Q gi|254780900|r 283 TNAVVIETNGLGKLTMTGPGAGGSATASAVLGDICSIAKTNTQKSVSWALGKESSSFSVIHCDGVYEEEKEYFIRLTIRN 362 (438)
Q Consensus 283 ~Nai~i~~~~~g~~~~~G~GAG~~~TAsaV~sDli~i~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~yYLRl~v~D 362 (438)
T Consensus 249 t~~v~v~~~~~~-----------------d~~EI~~~~~~f~~~P-------q~l~lP~~P~--------~p~~~~d~ed 296 (358)
T TIGR00978 249 TESVHVEFDKKF-----------------DIEEIREALKSFRGLP-------QKLGLPSAPE--------KPIIVRDEED 296 (358)
T ss_pred EEEEEEEECCCC-----------------CHHHHHHHHHHCCCCC-------CCCCCCCCCC--------CCEEEECCCC
T ss_conf 699999866877-----------------9899999998406776-------4257798869--------5379875886
Q ss_pred CCCHHHHHH--HHHHHCC--CCEEEEEECCCCCCCCEEEEEEEEEECCHHHHHHHHHHHH
Q ss_conf 887489999--9988669--9578888226778776135999921048899999999862
Q gi|254780900|r 363 FEGILDKIT--SQMSDFN--ISLRLFSCPHQEENSQEFSVFMITHKVSGKLIRDAIECFN 418 (438)
Q Consensus 363 kpGVLa~It--~ilak~~--ISIesi~Q~~~~~~~~~~~IViiTh~~~e~~i~~ai~~i~ 418 (438)
T Consensus 297 rPQPrlD~~nGGsa~~~GM~V~vGRlr~~~~f--~~~l~~VVLghNLVRGAAG~~lLnaE 354 (358)
T TIGR00978 297 RPQPRLDRDNGGSAAGKGMAVTVGRLREDSGF--RGSLKYVVLGHNLVRGAAGATLLNAE 354 (358)
T ss_pred CCCCHHHHCCCCCCCCCCCEEEEEEEEECCCC--CCCEEEEEEECCHHHHHHHHHHHHHH
T ss_conf 78504420258621268967897536434355--55113799723312588899999999