home *** CD-ROM | disk | FTP | other *** search
- ************************************************
- * Aspartate and glutamate racemases signatures *
- ************************************************
-
- Aspartate racemase (EC 5.1.1.13) and glutamate racemase (EC 5.1.1.3) are two
- evolutionary related bacterial enzymes that do not seem to require a cofactor
- for their activity [1]. Glutamate racemase, which interconverts L-glutamate
- into D-glutamate, is required for the biosynthesis of peptidoglycan and some
- peptide-based antibiotics such as gramicidin S.
-
- In addition to characterized aspartate and glutamate racemases, this family
- also includes a hypothetical protein from Erwinia carotovora and one from
- Escherichia coli (ygeA).
-
- Two conserved cysteines are present in the sequence of these enzymes. They are
- expected to play a role in catalytic activity by acting as bases in proton
- abstraction from the substrate. We developed signature patterns for both
- cysteines.
-
- -Consensus pattern: [LIVM]-x-C-x(0,1)-N-T-[MA]-[STH]
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: Caenorhabditis elegans hypothetical
- protein F42H10.1.
-
- -Consensus pattern: [LIVM](2)-x-[AG]-C-T-[DEH]-[LIVMF]-[PNGS]-x-[LIVM]
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Last update: June 1994 / Text revised.
-
- [ 1] Gallo K.A., Knowles J.R.
- Biochemistry 32:3981-3990(1993).
-