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- **************************************
- * Dehydroquinase class I active site *
- **************************************
-
- 3-dehydroquinate dehydratase (EC 4.2.1.10) (dehydroquinase) catalyzes the
- conversion of 3-dehydroquinate into 3-dehydroshikimate. It is the third step
- in the shikimate pathway for the biosynthesis of aromatic amino acids from
- chorismate. Two classes of dehydroqinases exist, known as types I and type II.
- The best studied type I enzyme is that from Escherichia coli (gene aroD) and
- related bacteria where it is a homodimeric protein with a chain length of
- about 250 residues. In fungi, dehydroquinase is part of a multifunctional
- enzyme which catalyzes five consecutive steps in the shikimate pathway. It has
- been shown [1], in aroD, that an histidine is involved in the catalytic
- mechanism; we have used the region around this residue as a signature pattern.
-
- -Consensus pattern: D-[LIVM]-[DE]-[LIVN]-x(18,20)-[LIVM](2)-x-[SC]-[NH]-H-D
- [H is the active site residue]
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
- -Last update: June 1994 / First entry.
-
- [ 1] Deka R.K., Kleanthous C., Coggins J.R.
- J. Biol. Chem. 267:22237-22242(1992).
-