>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=512.47 Aligned_cols=292 Identities=17% Similarity=0.240 Sum_probs=242.6 Q ss_pred EEEEECCCCHHHHHHHHHHHCC--CCEEEEEEECCCCCCCCCC------------HH-HHCC--CCEEEECCCCHHHHHH Q ss_conf 7999758867899999998629--9728999965300786006------------67-7479--9899993898378999 Q gi|254780294|r 3 KIFIDGEHGTTGLKIRSRIVQR--KDLCLLSIPCEERHNLRYR------------ED-LLNA--ADVSILCLPDVASLEI 65 (311) Q Consensus 3 kVaIvGATG~vG~~li~lL~~h--p~~~l~~l~s~~~ag~~~~------------~~-~~~~--~Divf~a~p~~~s~~~ 65 (311) 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 HHHHHHCCCCEEEECCCCCHHHHHHHHHCCCCCCHHHHHHCCCCEEEECCCCCCCCCHHHHHHHHHHCCCCCCCCEEEEE Q ss_conf 99986125848982276303555431100210004776520496077258421133112478888850345565026765 Q gi|254780294|r 66 IQLIKKNGINSRIIDTSTAHRIAPGWVYGFPEMDKSQKEKIRSARYITNPGCYATGAIAILRPLRKAKLLPDRYPITINA 145 (311) Q Consensus 66 ~~~~~~~g~~~~vid~ss~~R~~~~vpl~vPEvN~~~~~~~~~~~iIanPnC~~t~~~laL~PL~~~~~i~~~~~~~~~~ 145 (311) T Consensus 81 aP~a~k~g--~~VIDntS~fR~D~dVPLVVPEVN~~~~~~~~~kgIIANPNCstIqmv~~LkPl~~~~~ikr---VvVST 155 (350) T TIGR01296 81 APKAAKAG--VIVIDNTSAFRMDPDVPLVVPEVNLEDLKEFNKKGIIANPNCSTIQMVVVLKPLHDEAKIKR---VVVST 155 (350) T ss_pred HHHHHCCC--CEEEECCCCCCCCCCCCEEECCCCHHHHHCCCCCCCEECCCCCHHHHHHHHHHHHHHCCEEE---EEEEE T ss_conf 78886087--57981762000578986344377847763478888145886007779884046563067458---99972 Q ss_pred ECCCCCCCCCCCHHCCCCCC-----------------------CCCCCCCCCCCCCCCC----------CCCCCCHHHHC Q ss_conf 12333356100000013444-----------------------3223433222223444----------44342013321 Q gi|254780294|r 146 VSGYTGGGKKLISRMEQKNM-----------------------PDTISSNHFFYSLDLL----------HKHLPEITQYS 192 (311) Q Consensus 146 ~sg~sgaG~~~~~~~~~~~~-----------------------~~~~~~~~~~~~~~~~----------~~h~~e~~~~~ 192 (311) T Consensus 156 YQAVSGAG~~g~~eL~nQtka~~~~~E~~p~i~~~~~~~a~kf~~qIAFN~~P~Id~f~~dGsGYT~EE~Km~~Et~KIm 235 (350) T TIGR01296 156 YQAVSGAGNKGVEELKNQTKAVLEGKEKEPEIDALEVLKAKKFPYQIAFNAIPHIDKFKDDGSGYTKEETKMLFETRKIM 235 (350) T ss_pred CCCHHHHHHHHHHHHHHHHHHHHCCCCCCCCCCHHHCCCCCCCCCCCHHCCCCCCCCCCCCCCCCCHHHHHHHHHHHHHC T ss_conf 20035427999999899999985245888555543068888826750300001047412287866806678898634323 Q ss_pred C-CCEEEEEEEECCCCCCEEEEEEEEEEECCCC-CCCHHHHHHHHHHHHCCCCCCEEECCCCCCCCCCCCHHHHCCCCEE Q ss_conf 6-7113688752034332027899998632577-5448998866542200144305602787887898642762799607 Q gi|254780294|r 193 L-IKTSPMFLPSVGRFPQGIAIQISLDMERLSW-KTNSEELHSIFQEYYMGQNIVSVVPLEESRKIKTIACEMMSGNDKL 270 (311) Q Consensus 193 ~-~~~~~~~~~~~~~~~~g~~~~v~v~~~~~~~-~~~~~~~~~~~~~~~~~~~~v~v~~~~~~~~~~~p~~~~~~g~n~v 270 (311) T Consensus 236 g~~d~~vSaTCVRvPVf~GHS~S~~iEf---~~d~~~~e~~~E~Lk----~ApGV~~~--D~P~~~~Yp~P~~A~G~D~V 306 (350) T TIGR01296 236 GIPDLKVSATCVRVPVFTGHSESVNIEF---EKDEISPEDVREVLK----NAPGVVVI--DDPSQNLYPTPLEAVGEDEV 306 (350) T ss_pred CCCCCCEEEEEEECCCHHCCHHHHHHHH---CCCCCCHHHHHHHHC----CCCEEEEE--ECCCCCCCCCCHHEECCCCE T ss_conf 8877445157887411111123210011---168878889999734----79867998--76888778883101025715 Q ss_pred EEEEEEEC----CCCEEEEEEEECCCHHHHHHHHHHHHHHHH Q ss_conf 99999808----997699999722210136899999999872 Q gi|254780294|r 271 HLFFFDSS----ELPYINIIAVFDNLGKGASGAAIQNMDLLL 308 (311) Q Consensus 271 ~Vg~~~~~----~~~~~~v~s~~DNL~KGAAgnAVQn~nlm~ 308 (311) T Consensus 307 fVGRIRkDPGl~~~~gl~lwvv~DNLRKGAA~N~vqIAE~L~ 348 (350) T TIGR01296 307 FVGRIRKDPGLSDENGLHLWVVADNLRKGAALNSVQIAELLI 348 (350) T ss_pred EEEEEECCCCCCCCCCEEEEEEECHHHHHHHHHHHHHHHHHH T ss_conf 675444478886678325899622124678888999999863

HHsearch alignment for GI: 254780294 and conserved domain: TIGR01296