>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=96.20  E-value=0.031  Score=32.79  Aligned_cols=91  Identities=22%  Similarity=0.242  Sum_probs=58.9

Q ss_pred             CEEEEEECCCCHHHHHHHHHHHHCCCCEEEEEEEEC---CCCCC----EEEECCCCEEEEEECCHHH------HCCCCEE
Q ss_conf             617999816677899999999744998078999974---76587----5600278158998779436------3188478
Q gi|254780307|r    2 TFKVAVVGATGNVGREMLNIICERGFPISEVVALAS---ERSAG----TKVPFGKETIDVQDVKSYD------FSDTDIC   68 (335)
Q Consensus         2 ~~kvaIiGatG~vG~el~~lL~~~~~p~~~l~~~~s---~~~~G----~~i~~~~~~~~~~~~~~~~------~~~~Div   68 (335)
T Consensus         1 ~ikvav~GA~GRMG~~~ik~~~~-~ye~l~Lv~A~~~~~~~~~G~D~GEl~g~g~~gv~v~~~~~~~~~l~~~~~~~DVl   79 (281)
T TIGR00036         1 LIKVAVAGAAGRMGRELIKAVLQ-AYEGLKLVAAFERHGSSLQGTDIGELAGIGKVGVPVTDDLEAVLVLAFTETKPDVL   79 (281)
T ss_pred             CCCEEEECCCCHHHHHHHHHHHH-HCCCEEEEEEEEECCCCCCCCCCEEEECCCCCCCCHHHHHHHHHHHHHHCCCCCEE
T ss_conf             98358847887346999999997-48981678888616888566542024225547841000578899987402368647


Q ss_pred             EECCCHHHHHHHHHHHCCCCEEEEE
Q ss_conf             6068758999999750456517996
Q gi|254780307|r   69 LMSAGHAVSSQMSPKIAANGCIVID   93 (335)
Q Consensus        69 f~a~p~~~s~~~~~~~~~~g~~VID   93 (335)
T Consensus        80 iDFT~p~g~~~~~~~a~~~Gv~~V~  104 (281)
T TIGR00036        80 IDFTTPEGVVENVKIALENGVRLVV  104 (281)
T ss_pred             EECCCCHHHHHHHHHHHHCCCEEEE
T ss_conf             8738605678999999966885577