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- ******************************************************
- * ArgE / dapE / ACY1 / CPG2 / yscS family signatures *
- ******************************************************
-
- The following enzymes have been shown [1,2,3] to be evolutionary and
- functionally related:
-
- - In the biosynthetic pathway from glutamate to arginine, the removal of an
- acetyl group from N2-acetylornithine can be catalyzed via two distinct
- enzymatic strategies depending on the organism. In some bacteria and in
- fungi, the acetyl group is transferred on glutamate by glutamate
- acetyltransferase (EC 2.3.1.35) while in enterobacteria such as Escherichia
- coli, it is hydrolyzed by acetylornithine deacetylase (EC 3.5.1.16)
- (acetylornithinase) (AO) (gene argE). AO is a homodimeric cobalt-dependent
- enzyme which displays broad specificity and can also deacylates substrates
- such as acetylarginine, acetylhistidine, acetylglutamate semialdehyde, etc.
- - Succinyldiaminopimelate desuccinylase (EC 3.5.1.18) (SDAP) (gene dapE) is
- the enzyme which catalyzes the fifth step in the biosynthesis of lysine
- from aspartate semialdehyde: the hydrolysis of succinyl-diaminopimelate to
- diaminopimelate and succinate. SDAP is an enzyme that requires cobalt or
- zinc as a cofactor.
- - Aminoacylase-1 [4] (EC 3.5.1.14) (N-acyl-l-amino-acid amidohydrolase)
- (ACY1). ACY1 is a homodimeric zinc-binding mammalian enzyme that catalyzes
- the hydrolysis of N-alpha-acylated amino acids (except for aspartate).
- - A N-acyl-L-amino acid amidohydrolase from Bacillus stearothermophilus (gene
- ama).
- - Pseudomonas strain NS671 hydantoin utilization protein C (gene hyuC). It is
- involved in the conversion of 5-substituted hydantoins to corresponding L-
- amino acids.
- - Carboxypeptidase G2 (EC 3.4.17.11) (folate hydrolase G2) (gene cpg2) from
- Pseudomonas strain RS-16. This enzyme catalyzes the hydrolysis of reduced
- and non-reduced folates to pteroates and glutamate. G2 is a homodimeric
- zinc-dependent enzyme.
- - Vacuolar carboxypeptidase S (EC 3.4.17.4) (yscS) from yeast (gene CPS1).
-
- These enzymes share a few characteristics. They hydrolyse peptidic bonds in
- substrates that share a common structure, they are dependent on cobalt or zinc
- for their activity and they are proteins of 40 Kd to 60 Kd with a number of
- regions of sequence similarity.
-
- As signature patterns for these proteins, we selected two of the conserved
- regions. The first pattern is located in the N-terminal section of the enzyme,
- the second is located in the central section. Each pattern contains one of the
- two conserved histidine residues which could well be involved in binding metal
- ions.
-
- -Consensus pattern: [LIVMF]-x-[GSA]-H-x-D-x-V-x(9,13)-P-F
- -Sequences known to belong to this class detected by the pattern: ALL, except
- for hyuC and Bacillus stearothermophilus ama.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Consensus pattern: [SAGM]-x-[KRSA]-[SAG]-x(5)-[LIVM]-x(3)-G-x-[SAGPQ]-[SAG]-
- H-[SAGV]-[SAG]
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Last update: June 1994 / Patterns and text revised.
-
- [ 1] Meinnel T., Schmitt E., Mechulam Y., Blanquet S.
- J. Bacteriol. 174:2323-2331(1992).
- [ 2] Boyen A., Charlier D., Sakanyan V., Mett I., Glansdorff N.
- Gene 116:1-6(1992).
- [ 3] Sakanyan V., Desmarez L., Legrain C., Charlier D., Mett T.,
- Kochikyan A., Savchenko A., Boyen A., Falmagne P., Pirard A.,
- Glansdorff N.
- Appl. Environ. Microbiol. 59:3878-3888(1993).
- [ 4] Mitta M., Ohnogi H., Yamamoto A., Kato I., Sakiyama F., Tsunasawa S.
- J. Biochem. 112:737-742(1992).
-