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