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