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- * Glycosyl hydrolases family 32 active site *
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-
- It has been shown [1,2] that the following glycosyl hydrolases can be, on the
- basis of sequence similarities, classified into a single family:
-
- - Inulinase (EC 3.2.1.7) (or inulase) from the fungi Kluyveromyces marxianus.
- - Beta-fructofuranosidase (EC 3.2.1.26), commonly known as invertase in fungi
- and plants and as sucrase in bacteria (gene sacA or scrB).
- - Raffinose invertase (EC 3.2.1.26) (gene rafD) from Escherichia coli plasmid
- pRSD2.
- - Levanase (EC 3.2.1.65) (gene sacC) from Bacillus subtilis.
-
- One of the conserved regions in these enzymes is located in the N-terminal
- section and contains an aspartic acid residue which has been shown [3], in
- yeast invertase to be important for the catalytic mechanism. We have used this
- region as a signature pattern.
-
- -Consensus pattern: H-x(2)-P-x(4)-[LIVM]-N-D-P-N-G
- [D is the active site residue]
- -Sequences known to belong to this class detected by the pattern: ALL.
- -Other sequence(s) detected in SWISS-PROT: NONE.
-
- -Expert(s) to contact by email: Henrissat B.
- bernie@cermav.grenet.fr
-
- -Last update: December 1992 / Text revised.
-
- [ 1] Henrissat B.
- Biochem. J. 280:309-316(1991).
- [ 2] Gunasekaran P., Karunakaran T., Cami B., Mukundan A.G., Preziosi L.,
- Baratti J.
- J. Bacteriol. 172:6727-6735(1990).
- [ 3] Reddy V.A., Maley F.
- J. Biol. Chem. 265:10817-10120(1990).
-