home *** CD-ROM | disk | FTP | other *** search
- ******************************************************
- * Fructose-bisphosphate aldolase class-I active site *
- ******************************************************
-
- Fructose-bisphosphate aldolase (EC 4.1.2.13) [1,2] is a glycolytic enzyme that
- catalyzes the reversible aldol cleavage or condensation of fructose-1,6-
- bisphosphate into dihydroxyacetone-phosphate and glyceraldehyde 3-phosphate.
- There are two classes of fructose-bisphosphate aldolases with different
- catalytic mechanisms. Class-I aldolases [3], mainly found in higher
- eukaryotes, are homotetrameric enzymes which form a Schiff-base intermediate
- between the C-2 carbonyl group of the substrate (dihydroxyacetone phosphate)
- and the epsilon-amino group of a lysine residue.
-
- In vertebrates, three forms of this enzyme are found: aldolase A in muscle,
- aldolase B in liver and aldolase C in brain.
-
- The sequence around the lysine involved in the Schiff-base is highly conserved
- and can be used as a signature for this class of enzyme.
-
- -Consensus pattern: E-G-x-[LS]-L-K-P-N
- [K is involved in Schiff-base formation]
- -Sequences known to belong to this class detected by the pattern: ALL, except
- for plants chloroplast aldolase.
- -Other sequence(s) detected in SWISS-PROT: NONE.
- -Last update: October 1993 / Text revised.
-
- [ 1] Perham R.N.
- Biochem. Soc. Trans. 18:185-187(1990).
- [ 2] Marsh J.J., Lebherz H.G.
- Trends Biochem. Sci. 17:110-113(1992).
- [ 3] Freemont P.S., Dunbar B., Fothergill-Gilmore L.A.
- Biochem. J. 249:779-788(1988).
-