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- ***********************************************
- * Chalcone and stilbene synthases active site *
- ***********************************************
-
- Chalcone synthases (CHS) (EC 2.3.1.74) and stilbene synthases (STS) (formerly
- known as resveratrol synthases) are related plant enzymes [1]. CHS is an
- important enzyme in flavanoid biosynthesis and STS a key enzyme in stilbene-
- type phyloalexin biosynthesis. Both enzymes catalyze the addition of three
- molecules of malonyl-CoA to a starter CoA ester (a typical example is
- 4-coumaroyl-CoA), producing either a chalcone (with CHS) or stilbene (with
- STS).
-
- These enzymes are proteins of about 390 amino-acid residues. A conserved
- cysteine residue, located in the central section of these proteins, has been
- shown [2] to be essential for the catalytic activity of both enzymes and
- probably represents the binding site for the 4-coumaryl-CoA group. The region
- around this active site residue is well conserved and can be used as a
- signature pattern.
-
- -Consensus pattern: G-C-[FY]-[GA]-G-G-T-x(2)-R
- [C 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.
-
- -Expert(s) to contact by email: Schroeder J.
- raf@sun1.ruf.uni-freiburg.de
-
- -Last update: June 1992 / Pattern and text revised.
-
- [ 1] Schroeder J., Schroeder G.
- Z. Naturforsch. 45C:1-8(1990).
- [ 2] Lanz T., Tropf S., Marner F.-J., Schroeder J., Schroeder G.
- J. Biol. Chem. 266:9971-9976(1991).
-