>TIGR00036 dapB dihydrodipicolinate reductase; InterPro: IPR011770 Dihydrodipicolinate reductase is an enzyme found in bacteria and higher plants which is involved in the biosynthesis of diaminopimelic acid, a component of bacterial cell walls, and the essential amino acid L-lysine. It catalyses the the reduced pyridine nucleotide-dependent reduction of the alpha,beta-unsaturated cyclic imine, dihydrodipicolinate, to generate tetrahydrodipicolinate as shown below : 2,3-dihydrodipicolinate + NAD(P)H = 2,3,4,5-tetrahydrodipicolinate + NAD(P)(+) As this enzyme is not found in mammals it is a potential target for the development of novel antibacterial and herbicidal compounds. The structures of the Escherichia coli (P04036 from SWISSPROT) and Mycobacterium tuberculosis (P72024 from SWISSPROT) enzymes have been determined , . The enzyme is a homotetramer where each monomer is composed of two domains, an N-terminal NAD(P)H-binding domain which forms a Rossman fold, and a C-terminal substrate-binding domain that forms an open, mixed alpha-beta sandwich.Tetramerisation occurs exclusively through interactions between C-terminal domain residues. Both enzymes show relatively little preference for either NADH or NADPH as cofactor. Conformational changes upon substrate binding bring the cofactor and substrate into close proximity and allow catalysis to occur. ; GO: 0008839 dihydrodipicolinate reductase activity, 0009089 lysine biosynthetic process via diaminopimelate, 0005737 cytoplasm.

Probab=97.73 E-value=0.00082 Score=44.51 Aligned_cols=176 Identities=18% Similarity=0.176 Sum_probs=107.1 Q ss_pred EEEEECC-CHHHHHHHHHHHHCCCCCCEEEEEEC-CHHHHHHHHHHHHHHCCCCCCCCCEEEEECCCCHHHHH-HHH-HH Q ss_conf 1999849-87799999999960898725999639-99999999987343024555557308994378989999-999-75 Q gi|254780742|r 4 NVLIIGA-GGVAHVVAHKCAQNNDILGDINIASR-TLQKCSKIIDSIYKKKSLKIDGKLAIHQVDALNIKAVV-ELI-KK 79 (419) Q Consensus 4 ~ilv~Ga-G~vG~~~~~~L~~~~~~~~~i~va~r-~~~~~~~~~~~l~~~~~~~~~~~~~~~~~D~~d~~~l~-~~~-~~ 79 (419) T Consensus 3 kvav~GA~GRMG~~~ik~~~~~ye~l~Lv~A~~~~~~~~~G~D~GEl~g---------~g~~gv~v~~~~~~~~~l~~~~ 73 (281) T TIGR00036 3 KVAVAGAAGRMGRELIKAVLQAYEGLKLVAAFERHGSSLQGTDIGELAG---------IGKVGVPVTDDLEAVLVLAFTE 73 (281) T ss_pred CEEEECCCCHHHHHHHHHHHHHCCCEEEEEEEEECCCCCCCCCCEEEEC---------CCCCCCCHHHHHHHHHHHHHHC T ss_conf 3588478873469999999974898167888861688856654202422---------5547841000578899987402 Q ss_pred CCCCEEEECCCCCCCHHHHHHHHHCCCCEEE-ECCCCCCHHCCCCCCCCHHHHHHHHHHHHHCCCEEEECCCHHHHHHHH Q ss_conf 3972999737610032789999862886896-036642000014420000357751088885188699537501114889 Q gi|254780742|r 80 TNSQIIINVGSSFLNMSVLRACIDSNVAYID-TAIHESPLKICESPPWYNNYEWSLLDECRTKSITAILGAGFDPGVVNA 158 (419) Q Consensus 80 ~~~dvVin~~~p~~~~~v~~a~i~~g~hyvD-~s~~~~~~~~~~~~~~~~~~~~~l~~~a~~ag~~~i~~~G~~PGl~~l 158 (419) T Consensus 74 ~~~DVliDFT~p~g~~~~~~~a~~~Gv~~V~GTTGf~------------e~~~~~~~~~a~~~~~~~v~A~NFa~GV~~~ 141 (281) T TIGR00036 74 TKPDVLIDFTTPEGVVENVKIALENGVRLVVGTTGFS------------EEDLQELRDLAEKKGVAAVIAPNFAIGVNLM 141 (281) T ss_pred CCCCEEEECCCCHHHHHHHHHHHHCCCEEEECCCCCC------------HHHHHHHHHHHHHCCCCEEEECCCHHHHHHH T ss_conf 3686478738605678999999966885577166899------------8999999999986499789846506899999 Q ss_pred --HHHHHHHHHCCCCCEEEEEEC-CCCCCCCCCCCCCCHHHHHHHC Q ss_conf --999999974366638976302-4788886665425689988622 Q gi|254780742|r 159 --FARLAQDEYFDKITDIDIIDV-NAGKHDKYFATNFDAEINLREF 201 (419) Q Consensus 159 --la~~~~~~~~d~~~~i~~~~~-~~~~~~~~~~~~~s~~~~l~~~ 201 (419) T Consensus 142 ~K~~~~aA~~-l~D~~DiEIIE~HHr~K~DAPSGTAL~~~E~i~~~ 186 (281) T TIGR00036 142 FKLLEKAAKY-LGDYTDIEIIELHHRHKKDAPSGTALKLAEIIAEA 186 (281) T ss_pred HHHHHHHHHH-HCCCCCEEEEECHHCCCCCCCCHHHHHHHHHHHHH T ss_conf 9999999876-24565545441200258999707899999999987

HHsearch alignment for GI: 254780742 and conserved domain: TIGR00036