>TIGR00674 dapA dihydrodipicolinate synthase; InterPro: IPR005263 Dihydropicolinate synthase (DHDPS) is the key enzyme in lysine biosynthesis via the diaminopimelate pathway of prokaryotes, some phycomycetes and higher plants. The enzyme catalyses the condensation of L-aspartate-beta-semialdehyde and pyruvate to dihydropicolinic acid via a ping-pong mechanism in which pyruvate binds to the enzyme by forming a Schiff-base with a lysine residue . Three other proteins are structurally related to DHDPS and probably also act via a similar catalytic mechanism. These are Escherichia coli N-acetylneuraminate lyase (4.1.3.3 from EC, IPR005264 from INTERPRO) (gene nanA), which catalyzes the condensation of N-acetyl-D-mannosamine and pyruvate to form N-acetylneuraminate; Sinorhizobium meliloti protein mosA , which is involved in the biosynthesis of the rhizopine 3-O-methyl-scyllo-inosamine; and E. coli hypothetical protein yjhH. The sequences of DHDPS from different sources are well-conserved. The structure takes the form of a homotetramer, in which 2 monomers are related by an approximate 2-fold symmetry . Each monomer comprises 2 domains: an 8-fold alpha-/beta-barrel, and a C-terminal alpha-helical domain. The fold resembles that of N-acetylneuraminate lyase. The active site lysine is located in the barrel domain, and has access via 2 channels on the C-terminal side of the barrel. This family represents a subclass of dihydrodipicolinate synthase. ; GO: 0008840 dihydrodipicolinate synthase activity, 0019877 diaminopimelate biosynthetic process.

Probab=96.92  E-value=0.009  Score=38.48  Aligned_cols=51  Identities=16%  Similarity=0.183  Sum_probs=37.9

Q ss_pred             HHHHHHHHHHHCC-CCEEEEEECCCCCHHHH--HHHHHCCCCEEEECHHHHCCCHHHHHHHH
Q ss_conf             6899999997408-97489996788999999--99998399975452787706978999999
Q gi|254780434|r  273 STIALAKIRQRVG-PKIAIIGTGGISSTKDA--LDKIMAGANLIQLYSAMIYEGISLPKRII  331 (362)
Q Consensus       273 al~~i~~i~~~~~-~~i~IIg~GGI~s~~Da--~e~l~aGAs~VQi~Tali~~Gp~~~~~I~  331 (362)
T Consensus       164 ~l~~~~~i~~~~p~~dF~v------lsGDD~l~l~~~~~Gg~GVISV~~N~~--P~~~~emv  217 (288)
T TIGR00674       164 NLERISEIKAITPDDDFVV------LSGDDALTLPILALGGKGVISVTSNVA--PKLMKEMV  217 (288)
T ss_pred             CHHHHHHHHHHCCCCCEEE------EECCCCHHHHHHHHCCCEEEEHHHHHH--HHHHHHHH
T ss_conf             8899999998668985388------847861136999818961673005556--89999999