home *** CD-ROM | disk | FTP | other *** search
- ********************************************************
- * Phenylalanine and histidine ammonia-lyases signature *
- ********************************************************
-
- Phenylalanine ammonia-lyase (EC 4.3.1.5) (PAL) is a key enzyme of plant and
- fungi phenylpropanoid metabolism which is involved in the biosynthesis of a
- wide variety of natural products such as flavanoids, furanocoumarin
- phytoalexins and cell wall component. PAL catalyzes the removal of an ammonia
- group from phenylalanine to form trans-cinnamate.
-
- Histidine ammonia-lyase (EC 4.3.1.3) (histidase) catalyzes the first step in
- histidine degradation, the removal of an ammonia group from histidine to
- produce urocanic acid.
-
- The two types of enzymes are functionally and structurally related [1]. They
- are the only enzymes which are known to have the modified amino acid dehydro-
- alanine (DHA) in their active site.
-
- As a signature pattern for these enzymes we selected the most conserved region
- which is located in the central part of these proteins.
-
- -Consensus pattern: G-[STG]-[LIVM]-[STG]-[AC]-S-G-D-L-x-P-L-[STA]
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
- -Last update: June 1992 / Pattern and text revised.
-
- [ 1] Taylor R.G., Lambert M.A., Sexsmith E., Sadler S.J., Ray P.N.,
- Mahuran D.J., McInnes R.R.
- J. Biol. Chem. 265:18192-18199(1990).
-