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- **********************
- * Amidases signature *
- **********************
-
- It has been shown [1,2,3] that several enzymes from various prokaryotic and
- eukaryotic organisms which are involved in the hydrolysis of amides (amidases)
- are evolutionary related. These enzymes are listed below.
-
- - Indoleacetamide hydrolase (EC 3.5.1.-), a bacterial plasmid-encoded enzyme
- that catalyzes the hydrolysis of indole-3-acetamide (IAM) into indole-3-
- acetate (IAA), the second step in the biosynthesis of auxins from
- tryptophan.
- - Acetamidase from Emericella nidulans (gene amdS), an enzyme which allows
- acetamide to be used as a sole carbon or nitrogen source.
- - Amidase (EC 3.5.1.4) from Rhodococcus sp. N-774 and Brevibacterium sp. R312
- (gene amdA). This enzyme hydrolyzes propionamides efficiently, and also at
- a lower efficiency, acetamide, acrylamide and indoleacetamide.
- - Amidase (EC 3.5.1.4) from Pseudomonas chlororaphis.
- - 6-aminohexanoate-cyclic-dimer hydrolase (EC 3.5.2.12) (nylon oligomers
- degrading enzyme E1) (gene nylA), a bacterial plasmid encoded enzyme which
- catalyzes the first step in the degradation of 6-aminohexanoic acid cyclic
- dimer, a by-product of nylon manufacture [4].
- - A putative amidase from yeast. The exact function of this protein is not
- yet known.
-
- All these enzymes contains in their central section a highly conserved region
- rich in glycine, serine, and alanine residues. We have used this region as a
- signature pattern.
-
- -Consensus pattern: G-G-S-S-[GS]-G-x-[GSA](2)-x-[LIVM]-[GSA]-x(6)-[GSA]-x-G-x-
- D-x-[GA](2)-S-[LIVM]-R-x-P-[GSA]
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
- -Last update: December 1992 / Pattern and text revised.
-
- [ 1] Mayaux J.-F., Cerbelaud E., Soubrier F., Faucher D., Petre D.
- J. Bacteriol. 172:6764-6773(1990).
- [ 2] Hashimoto Y., Nishiyama M., Ikehata O., Horinouchi S., Beppu T.
- Biochim. Biophys. Acta 1088:225-233(1991).
- [ 3] Chang T.-H., Abelson J.
- Nucleic Acids Res. 18:7180-7180(1990).
- [ 4] Tsuchiya K., Fukuyama S., Kanzaki N., Kanagawa K., Negoro S., Okada H.
- J. Bacteriol. 171:3187-3191(1989).
-