HHsearch alignment for GI: 254780654 and conserved domain: TIGR01296

>TIGR01296 asd_B aspartate-semialdehyde dehydrogenase; InterPro: IPR005986 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-semialdehyde dehydrogenase most commonly found in bacteria. Note that some bacteria, such as Chlamydia, contain the enzyme from the other subgroup (IPR005676 from INTERPRO) instead.; GO: 0004073 aspartate-semialdehyde dehydrogenase activity, 0009086 methionine biosynthetic process, 0009088 threonine biosynthetic process.
Probab=99.50  E-value=1.2e-13  Score=109.82  Aligned_cols=233  Identities=21%  Similarity=0.293  Sum_probs=171.9

Q ss_pred             EEEEEC-CCHHHHHHHHHHHHCCCCCEEEEEECCCCCHHHHHHHHHHCCCCCCCCCEEEEECCCCCCCCCCCCCCCCCCC
Q ss_conf             898856-6868899999999688887289996068899999988751441255674089836530016565421101233
Q gi|254780654|r    4 KVAING-FGRIGRCILRAAVESRRDDVRIVAINDLNSIETMAHLLRYDSVHGRFPGEVKIIGDTIDVGLGPIQVTSIRDP   82 (333)
Q Consensus         4 kIgING-fGRIGR~v~R~~~~~~~~~i~ivaINd~~~~~~~~~Ll~yDS~hG~~~~~v~~~~~~l~in~~~i~i~~~~~p   82 (333)
T Consensus         1 ~vAiVGATG~VGq~~lk~LeeR---~FP~~---~-------~~~~----------AS~RS~G~~~~F~gke~~v~~~-~~   56 (350)
T TIGR01296         1 NVAIVGATGAVGQEMLKILEER---NFPID---K-------LVLL----------ASERSAGRKVTFKGKELEVEEA-KK   56 (350)
T ss_pred             CEEEEECCCHHHHHHHHHHHCC---CCCHH---H-------HHHH----------CCCCCCCCEEEECCCEEEEECC-CC
T ss_conf             9478962674799998764136---78775---5-------6441----------0567888578512753660101-00


Q ss_pred             CCCCCCC--CCEEEEECCCCCCCCCCCHHHHCCCCEEEE--ECCCCC-CCEEEEEECCCCCCCC-C-CEEECCCCCCHHH
Q ss_conf             3334465--632786066433321220011058423433--036788-7348984055321222-2-1033057641023
Q gi|254780654|r   83 QDLPWGD--VDVAMECTGFFVTQEKASLHLSNGSQRVLV--SAPCKG-VKKTIVYGVNHQSLNK-E-DKVVSNASCTTNC  155 (333)
Q Consensus        83 ~~i~W~~--vDiViEcTG~f~~~~~~~~HL~~GakkVIi--SaP~kd-~~~tiV~GvN~~~~~~-~-~~IiS~aSCTtn~  155 (333)
T Consensus        57 ~n-~F~gekidIAlFSAGgsvSke~aP~a~k~g~~-VIDntS~fR~D~dVPLVVPEVN~~~~~~~~~kgIIANPNCstIq  134 (350)
T TIGR01296        57 EN-SFEGEKIDIALFSAGGSVSKEFAPKAAKAGVI-VIDNTSAFRMDPDVPLVVPEVNLEDLKEFNKKGIIANPNCSTIQ  134 (350)
T ss_pred             CC-CCCCCEEEEEEECCCHHHHHHHHHHHHCCCCE-EEECCCCCCCCCCCCEEECCCCHHHHHCCCCCCCEECCCCCHHH
T ss_conf             14-88877033456515313348887888608757-98176200057898634437784776347888814588600777


Q ss_pred             HHHHHHHHHHCCCHHHHHCCCCCCCCC------------CCCCCCCCCCCC-----------CCCCCCCCCCCCCC----
Q ss_conf             466888754121023221001134532------------223556654530-----------00112365646453----
Q gi|254780654|r  156 LVPVVHVLDKMFGIEKGYMTTVHSYTG------------DQHVLDAGHSDL-----------YRSRAAAISMVPTS----  208 (333)
Q Consensus       156 laPvlk~l~~~~gI~~g~~TTiH~~t~------------~Q~l~D~~~~d~-----------Rr~Raa~~niIPt~----  208 (333)
T Consensus       135 mv~~LkPl~~~~~ikrVvVSTYQAVSGAG~~g~~eL~nQtka~~~~~E~~p~i~~~~~~~a~kf~~qIAFN~~P~Id~f~  214 (350)
T TIGR01296       135 MVVVLKPLHDEAKIKRVVVSTYQAVSGAGNKGVEELKNQTKAVLEGKEKEPEIDALEVLKAKKFPYQIAFNAIPHIDKFK  214 (350)
T ss_pred             HHHHHHHHHHHCCEEEEEEEECCCHHHHHHHHHHHHHHHHHHHHCCCCCCCCCCHHHCCCCCCCCCCCHHCCCCCCCCCC
T ss_conf             98840465630674589997220035427999999899999985245888555543068888826750300001047412


Q ss_pred             -CH--H-------HHHHHHHH--HHCCCCCEEEEEECCCCCCHHHHHHHHHHC-CCCHHHHHHHHHHHH
Q ss_conf             -11--2-------45677776--201787104343123353101123433201-220678899998741
Q gi|254780654|r  209 -TG--A-------AKAVELVL--PNLKGKLDGSSIRVPTPNVSMVDLKCVTSR-DVNIDEINATMKYFA  264 (333)
Q Consensus       209 -Tg--a-------a~ai~~vl--P~l~gkl~g~a~RVPt~~vS~vDlt~~l~k-~~t~e~in~~~~~as  264 (333)
T Consensus       215 ~dGsGYT~EE~Km~~Et~KImg~~d~--~vSaTCVRvPVf~GHS~S~~iEf~~d~~~~e~~~E~Lk~Ap  281 (350)
T TIGR01296       215 DDGSGYTKEETKMLFETRKIMGIPDL--KVSATCVRVPVFTGHSESVNIEFEKDEISPEDVREVLKNAP  281 (350)
T ss_pred             CCCCCCCHHHHHHHHHHHHHCCCCCC--CEEEEEEECCCHHCCHHHHHHHHCCCCCCHHHHHHHHCCCC
T ss_conf             28786680667889863432388774--45157887411111123210011168878889999734798