>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=100.00 E-value=0 Score=705.30 Aligned_cols=331 Identities=59% Similarity=0.891 Sum_probs=324.0 Q ss_pred EEEEECCCCHHHHHHHHHHHHCCCCEEEEEEEECCCCCCEEEECCCCEEEEEECCHH-HHCC--CCEEEECCCHHHHHHH Q ss_conf 799981667789999999974499807899997476587560027815899877943-6318--8478606875899999 Q gi|254780307|r 4 KVAVVGATGNVGREMLNIICERGFPISEVVALASERSAGTKVPFGKETIDVQDVKSY-DFSD--TDICLMSAGHAVSSQM 80 (335) Q Consensus 4 kvaIiGatG~vG~el~~lL~~~~~p~~~l~~~~s~~~~G~~i~~~~~~~~~~~~~~~-~~~~--~Divf~a~p~~~s~~~ 80 (335) T Consensus 1 ~vAiVGATG~VGq~~lk~LeeR~FP~~~~~~~AS~RS~G~~~~F~gke~~v~~~~~~n~F~gekidIAlFSAGgsvSke~ 80 (350) T TIGR01296 1 NVAIVGATGAVGQEMLKILEERNFPIDKLVLLASERSAGRKVTFKGKELEVEEAKKENSFEGEKIDIALFSAGGSVSKEF 80 (350) T ss_pred CEEEEECCCHHHHHHHHHHHCCCCCHHHHHHHCCCCCCCCEEEECCCEEEEECCCCCCCCCCCEEEEEEECCCHHHHHHH T ss_conf 94789626747999987641367877556441056788857851275366010100148887703345651531334888 Q ss_pred HHHHCCCCEEEEECCCCHHCCCCCCCCCCCHHHHHHCCCCCCCEECCCCCCCCCCCCCCCHHHHCCCCCCEEEEECCCCC Q ss_conf 97504565179961451001121112364101111103334312126764322211122001101787411465215221 Q gi|254780307|r 81 SPKIAANGCIVIDNSSAWRYDSDVPLIVPEVNPQTISLASRKNIIANPNCSTIQLVVALKPLHDLAMIKRVVVTTYQSVS 160 (335) Q Consensus 81 ~~~~~~~g~~VIDlS~~~R~~~d~p~~lPein~~~i~~~~~~~~VanPgC~at~~~l~L~PL~~~~~i~~v~v~s~~g~S 160 (335) T Consensus 81 aP~a~k~g~~VIDntS~fR~D~dVPLVVPEVN~~~~~~~~~kgIIANPNCstIqmv~~LkPl~~~~~ikrVvVSTYQAVS 160 (350) T TIGR01296 81 APKAAKAGVIVIDNTSAFRMDPDVPLVVPEVNLEDLKEFNKKGIIANPNCSTIQMVVVLKPLHDEAKIKRVVVSTYQAVS 160 (350) T ss_pred HHHHHCCCCEEEECCCCCCCCCCCCEEECCCCHHHHHCCCCCCCEECCCCCHHHHHHHHHHHHHHCCEEEEEEEECCCHH T ss_conf 78886087579817620005789863443778477634788881458860077798840465630674589997220035 Q ss_pred CCCCCCCCCHHHHHHHHCCCCCCC----------CCCCCCCCCCCCCCCCCCCCCCC--CCCHHHHEEEEEEEEEC-CCC Q ss_conf 123211000000000000124554----------44455101374042255323472--00001101121000102-343 Q gi|254780307|r 161 GAGKKGIDELLAQTKAFLAKKTIE----------NRVFTKNIAFNVIPHIDVFMDGG--STKEEWKVLVETQKILD-PNI 227 (335) Q Consensus 161 GaG~~~~~eL~~q~~~~~~~~~~~----------~~~~~~~la~n~iP~i~~~~~~g--~~~ee~k~~~E~~kil~-~~~ 227 (335) T Consensus 161 GAG~~g~~eL~nQtka~~~~~E~~p~i~~~~~~~a~kf~~qIAFN~~P~Id~f~~dGsGYT~EE~Km~~Et~KImg~~d~ 240 (350) T TIGR01296 161 GAGNKGVEELKNQTKAVLEGKEKEPEIDALEVLKAKKFPYQIAFNAIPHIDKFKDDGSGYTKEETKMLFETRKIMGIPDL 240 (350) T ss_pred HHHHHHHHHHHHHHHHHHCCCCCCCCCCHHHCCCCCCCCCCCHHCCCCCCCCCCCCCCCCCHHHHHHHHHHHHHCCCCCC T ss_conf 42799999989999998524588855554306888882675030000104741228786680667889863432388774 Q ss_pred CCCCCCEEEEEEECCEEEEEEEECC-CCCHHHHHHHHHHCCCCEEECCCCCCCCCCHHHHCCCCCEEEEEEEEC--CCCC Q ss_conf 2211200112110215798767246-587899987310069838810268899976154348973267527763--6688 Q gi|254780307|r 228 KVSCTAARVPVFIGHAESVNIEFEK-DISIKDAVAAINKSKGCIVVDKPDKNEYITPVESIRRDLVFVSRIRKD--PTLK 304 (335) Q Consensus 228 ~v~~t~~~vPv~rG~~~ti~i~l~~-~~~~~~i~~~~~~~~~~~~~~~~~~~~~~~~~~~~g~~~v~Vgrvr~~--~~~~ 304 (335) T Consensus 241 ~vSaTCVRvPVf~GHS~S~~iEf~~d~~~~e~~~E~Lk~ApGV~~~D~P~~~~Yp~P~~A~G~D~VfVGRIRkDPGl~~~ 320 (350) T TIGR01296 241 KVSATCVRVPVFTGHSESVNIEFEKDEISPEDVREVLKNAPGVVVIDDPSQNLYPTPLEAVGEDEVFVGRIRKDPGLSDE 320 (350) T ss_pred CEEEEEEECCCHHCCHHHHHHHHCCCCCCHHHHHHHHCCCCEEEEEECCCCCCCCCCHHEECCCCEEEEEEECCCCCCCC T ss_conf 45157887411111123210011168878889999734798679987688877888310102571567544447888667 Q ss_pred CEEEEEEEECCHHHHHHHHHHHHHHHHHHH Q ss_conf 869999970130223679999999998853 Q gi|254780307|r 305 SGLNLWIVANNLRKGAALNAVQIAELVAQE 334 (335) Q Consensus 305 ~~~~~~~~~DNL~kGAAg~AVq~anlm~~~ 334 (335) T Consensus 321 ~gl~lwvv~DNLRKGAA~N~vqIAE~L~k~ 350 (350) T TIGR01296 321 NGLHLWVVADNLRKGAALNSVQIAELLIKN 350 (350) T ss_pred CCEEEEEEECHHHHHHHHHHHHHHHHHHCC T ss_conf 832589962212467888899999986329

HHsearch alignment for GI: 254780307 and conserved domain: TIGR01296