home *** CD-ROM | disk | FTP | other *** search
- *****************************************************************
- * Dihydroxy-acid and 6-phosphogluconate dehydratases signatures *
- *****************************************************************
-
- Two bacterial dehydratases have been shown [1] to be evolutionary related:
-
- - Dihydroxy-acid dehydratase (EC 4.2.1.9) (gene ilvD) which catalyzes the
- fourth step in the biosynthesis of isoleucine and valine, the dehydratation
- of 2,3-dihydroxy-isovaleic acid into alpha-ketoisovaleric acid.
- - 6-phosphogluconate dehydratase (EC 4.2.1.12) (gene edd) which catalyzes the
- first step in the Entner-Doudoroff pathway, the dehydratation of 6-phospho-
- D-gluconate into 6-phospho-2-dehydro-3-deoxy-D-gluconate.
-
- Both enzymes are proteins of about 600 amino acid residues. We selected two
- highly conserved regions as signature patterns. The first pattern is located
- in the N-terminal part while the second is from the C-terminal half.
-
- -Consensus pattern: C-D-K-x(2)-P-G-x(3)-[GA]
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Consensus pattern: A-L-[LIVM]-T-D-G-R-[LIVMF]-S-[GA](2)-[ST]
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Last update: October 1993 / First entry.
-
- [ 1] Egan S.E., Fliege R., Tong S., Shibata A., Wolf R.E. Jr., Conway T.
- J. Bacteriol. 174:4638-4646(1992).
-