HHsearch alignment for GI: 254780294 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=100.00  E-value=0  Score=446.71  Aligned_cols=289  Identities=19%  Similarity=0.212  Sum_probs=239.3

Q ss_pred             CEEEEECCCCHHHHHHHHHHHCCC-CEEEEEE-ECCCCCCCCCCHH-------------------------H-----HCC
Q ss_conf             079997588678999999986299-7289999-6530078600667-------------------------7-----479
Q gi|254780294|r    2 YKIFIDGEHGTTGLKIRSRIVQRK-DLCLLSI-PCEERHNLRYRED-------------------------L-----LNA   49 (311)
Q Consensus         2 ~kVaIvGATG~vG~~li~lL~~hp-~~~l~~l-~s~~~ag~~~~~~-------------------------~-----~~~   49 (311)
T Consensus         1 ~~VavLGaTG~VGq~f~~lL~~HPr~Fe~~~v~AS~~saGk~Yge~~~W~~~~~g~~Pe~~~dl~i~~~~p~ri~~d~~d   80 (358)
T TIGR00978         1 VRVAVLGATGLVGQKFVKLLEKHPRYFELAKVVASERSAGKRYGEVVKWREILSGDIPEEVRDLEIVETEPVRIAEDHKD   80 (358)
T ss_pred             CEEEEEECCCHHHHHHHHHHHHCCCEEEEEEEEECCCCCCCCHHHHHHHCCCCCCCCCHHHCCCEEECCCCCEEEECCCC
T ss_conf             96899706554689999997526981228898836865576744543012123685843234765413474335661798


Q ss_pred             CCEEEECCCCHHHHHHHHHHHHCCCCEEEECCCCCHHHHHHHHHCCCCCCHHHHHHCCCC--------EEEECCCCCCCC
Q ss_conf             989999389837899999986125848982276303555431100210004776520496--------077258421133
Q gi|254780294|r   50 ADVSILCLPDVASLEIIQLIKKNGINSRIIDTSTAHRIAPGWVYGFPEMDKSQKEKIRSA--------RYITNPGCYATG  121 (311)
Q Consensus        50 ~Divf~a~p~~~s~~~~~~~~~~g~~~~vid~ss~~R~~~~vpl~vPEvN~~~~~~~~~~--------~iIanPnC~~t~  121 (311)
T Consensus        81 VD~vfSALp~~~A~~~E~~la~~G--~~VfSNAs~~RmdpdVPli~PEVN~~hL~l~~~Q~~RrgW~G~ivtNPNC~t~~  158 (358)
T TIGR00978        81 VDIVFSALPSEVAEEVEPKLAEEG--IIVFSNASAHRMDPDVPLIVPEVNSDHLELLKVQKERRGWKGFIVTNPNCTTAG  158 (358)
T ss_pred             CEEEEECCCHHHHHHHHHHHHHCC--CEEEECCCCCCCCCCCCEEECCCCHHHHHHHHHCCCCCCCCCEEEECCHHHHHH
T ss_conf             269981499799999999998569--889876847788888677833356147999985400168861799576167887


Q ss_pred             CHHHHHHHHHHCCCCCCCCEEEEEECCCCCCCCCCCHHCCCCCCCCCCCCCCCCCCCCCCCCCCCCHHHHC-CC------
Q ss_conf             11247888885034556502676512333356100000013444322343322222344444342013321-67------
Q gi|254780294|r  122 AIAILRPLRKAKLLPDRYPITINAVSGYTGGGKKLISRMEQKNMPDTISSNHFFYSLDLLHKHLPEITQYS-LI------  194 (311)
Q Consensus       122 ~~laL~PL~~~~~i~~~~~~~~~~~sg~sgaG~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~h~~e~~~~~-~~------  194 (311)
T Consensus       159 lTl~LkPl~d~~~~~~V~v~TmQAv---SGAGY~GVp~~~-------I~dN~iP~I~GEE~KIe~E~~KilsGkl~~g~~  228 (358)
T TIGR00978       159 LTLALKPLIDAFGIKKVIVTTMQAV---SGAGYPGVPSMD-------ILDNVIPHIGGEEEKIERETLKILSGKLENGKI  228 (358)
T ss_pred             HHHHHHHHHHCCCCCEEEEEEECCH---HCCCCCCCCHHH-------HHCCCCCCCCCHHHHHHHHHHHHHCCCCCCCEE
T ss_conf             7610134643058456999872000---148888875455-------533616550633589876213333440038846


Q ss_pred             ---CEEEEEEEECCCCCCEEEEEEEEEEECCCCCCCHHHHHHHHHHHHCC----------CCCCEEECCCCCCCCCCCCH
Q ss_conf             ---11368875203433202789999863257754489988665422001----------44305602787887898642
Q gi|254780294|r  195 ---KTSPMFLPSVGRFPQGIAIQISLDMERLSWKTNSEELHSIFQEYYMG----------QNIVSVVPLEESRKIKTIAC  261 (311)
Q Consensus       195 ---~~~~~~~~~~~~~~~g~~~~v~v~~~~~~~~~~~~~~~~~~~~~~~~----------~~~v~v~~~~~~~~~~~p~~  261 (311)
T Consensus       229 ~PA~~~~~at~~RVPV~~GHt~~v~v~---~~~~~d~~EI~~~~~~f~~~Pq~l~lP~~P~~p~~~~d~edrPQPr---l  302 (358)
T TIGR00978       229 EPAEFEVSATTTRVPVLDGHTESVHVE---FDKKFDIEEIREALKSFRGLPQKLGLPSAPEKPIIVRDEEDRPQPR---L  302 (358)
T ss_pred             EEECCEEEEEEEECCCCCCCEEEEEEE---ECCCCCHHHHHHHHHHCCCCCCCCCCCCCCCCCEEEECCCCCCCCH---H
T ss_conf             420440689987444111646999998---6687798999999984067764257798869537987588678504---4


Q ss_pred             HHH------CCCCEEEEEEEEECCC--CEEEEEEEECCCHHHHHHHHHHHHHHHH
Q ss_conf             762------7996079999980899--7699999722210136899999999872
Q gi|254780294|r  262 EMM------SGNDKLHLFFFDSSEL--PYINIIAVFDNLGKGASGAAIQNMDLLL  308 (311)
Q Consensus       262 ~~~------~g~n~v~Vg~~~~~~~--~~~~v~s~~DNL~KGAAgnAVQn~nlm~  308 (311)
T Consensus       303 D~~nGGsa~~~GM~V~vGRlr~~~~f~~~l~~VVLghNLVRGAAG~~lLnaEl~~  357 (358)
T TIGR00978       303 DRDNGGSAAGKGMAVTVGRLREDSGFRGSLKYVVLGHNLVRGAAGATLLNAELAY  357 (358)
T ss_pred             HHCCCCCCCCCCCEEEEEEEEECCCCCCCEEEEEEECCHHHHHHHHHHHHHHHHH
T ss_conf             2025862126896789753643435555113799723312588899999999860