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- *********************************************
- * Dihydrodipicolinate synthetase signatures *
- *********************************************
-
- Dihydrodipicolinate synthetase (EC 4.2.1.52) (DHDPS) [1] catalyzes, in higher
- plants chloroplast and in many bacteria (gene dapA), the first reaction
- specific to the biosynthesis of lysine and of diaminopimelate. DHDPS is
- responsible for the condensation of aspartate semialdehyde and pyruvate by a
- ping-pong mechanism in which pyruvate first binds to the enzyme by forming a
- Schiff-base with a lysine residue.
-
- The sequences of bacterial and plants DHDPS's are well conserved and we have
- developed two signature patterns for this enzyme. The first signature is
- centered on a perfectly conserved pentapeptide located in the N-terminal part
- of DHDPS. The second signature contains a lysine residue which has been shown,
- in the Escherichia coli enzyme [2], to be the one that forms a Schiff-base
- with the substrate.
-
- Escherichia coli N-acetylneuraminate lyase (EC 4.1.3.3) (gene nanA) catalyzes
- the condensation of N-acetyl-D-mannosamine and pyruvate to form N-
- acetylneuraminate. This enzyme is structurally related to DHDPS and probably
- also act via a similar catalytic mechanism.
-
- -Consensus pattern: G-x(3)-[LIVM]-[LIVMFY]-x(2)-G-[ST]-T-G-E-[GAS]-x(6)-E
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Consensus pattern: [LIVMY]-x-[GNT]-[LIVM]-x-[AG]-[LIVM]-K-[DEQ]-[STAC]-x-G
- [K is involved in Schiff-base formation]
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Last update: October 1993 / Patterns and text revised.
-
- [ 1] Kaneko T., Hashimoto T., Kumpaisal R., Yamada Y.
- J. Biol. Chem. 265:17451-17455(1990).
- [ 2] Laber B., Gomis-Rueth F.-X., Romao M.J., Huber R.
- Biochem. J. 288:691-695(1992).
-