PROSITE documentation PDOC00144
KDPG and KHG aldolases active site signatures


4-hydroxy-2-oxoglutarate aldolase (EC (KHG-aldolase) catalyzes the interconversion of 4-hydroxy-2-oxoglutarate into pyruvate and glyoxylate. Phospho-2-dehydro-3-deoxygluconate aldolase (EC (KDPG-aldolase) catalyzes the interconversion of 6-phospho-2-dehydro-3-deoxy-D-gluconate into pyruvate and glyceraldehyde 3-phosphate.

These two enzymes are structurally and functionally related [1]. They are both homotrimeric proteins of approximately 220 amino-acid residues. They are class I aldolases whose catalytic mechanism involves the formation of a Schiff-base intermediate between the substrate and the epsilon-amino group of a lysine residue. In both enzymes, an arginine is required for catalytic activity.

We developed two signature patterns for these enzymes. The first one contains the active site arginine and the second, the lysine involved in the Schiff-base formation.

Last update:

November 1997 / Patterns and text revised.


Technical section

PROSITE methods (with tools and information) covered by this documentation:

ALDOLASE_KDPG_KHG_1, PS00159; KDPG and KHG aldolases active site  (PATTERN)

ALDOLASE_KDPG_KHG_2, PS00160; KDPG and KHG aldolases Schiff-base forming residue  (PATTERN)


1AuthorsVlahos C.J. Dekker E.E.
TitleThe complete amino acid sequence and identification of the active-site arginine peptide of Escherichia coli 2-keto-4-hydroxyglutarate aldolase.
SourceJ. Biol. Chem. 263:11683-11691(1988).
PubMed ID3136164

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