Glycoside Hydrolase Family 37

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Glycoside Hydrolase Family GH37
Clan GH-G
Mechanism Inverting
Active site residues Inferred
CAZy DB link
http://www.cazy.org/GH37.html


Contents

Substrate specificities

GH37 glycoside hydrolases have been shown, to date, to hydrolyse only the disaccharide trehalose (α-D-glucopyranosyl-(1→1)-α-D-glucopyranoside) into two molecules of D-glucose (EC 3.2.1.28).

Kinetics and Mechanism

A trehalase from flesh fly was shown to hydrolyse with inversion of anomeric stereochemistry using 18O-labelled water [1]. The structural solution of the trehalase from Escherichia coli also demonstrates the active site catalytic residues are in a position consistent with an inverting mechanism [2].

Catalytic Residues

The catalytic residues have not been demonstrated unequivocally, but structural determination of the trehalase from Escherichia coli in complex with inhibitors in the active site implicate an aspartate residue (Asp312 in E. coli) as the catalytic general acid and a glutamate residue (Glu496 in E. coli) as the catalytic general base [2].

Three-dimensional structures

The only structural representative from GH37 to date is the trehalase from Escherichia coli, which was solved using X-ray crystallography [2]. The structure revealed a (α/α)6 barrel fold, similar to other α-toroidal glycosidases such as those in families GH94, GH15 and GH65. GH37 falls into clan GH-G. Structures have been solved with the inhibitors validoxylamine A, 1-thiatrehazolin and casuarine analogues [2, 3, 4].

Family Firsts

First sterochemistry determination
The inversion of stereochemistry for a trehalase from the flesh fly Sarcophaga barbata was first demonstrated by Clifford in 1980 [1].
First general acid identification
Predicted from structure determination [2], but not shown unequivocally.
First general base identification
Predicted from structure determination [2], but not shown unequivocally.
First 3-D structure
The GH37 trehalase from Escherichia coli was solved by X-ray crystallography [2].

References

  1. Clifford KH. Stereochemistry of the hydrolysis of trehalose by the enzyme trehalase prepared from the flesh fly Sarcophaga barbata. Eur J Biochem. 1980 May;106(1):337-40. PubMed ID:7341233 | HubMed [Clifford1980]
  2. Gibson RP, Gloster TM, Roberts S, Warren RA, Storch de Gracia I, García A, Chiara JL, and Davies GJ. Molecular basis for trehalase inhibition revealed by the structure of trehalase in complex with potent inhibitors. Angew Chem Int Ed Engl. 2007;46(22):4115-9. DOI:10.1002/anie.200604825 | PubMed ID:17455176 | HubMed [Gibson2007]
  3. Cardona F, Parmeggiani C, Faggi E, Bonaccini C, Gratteri P, Sim L, Gloster TM, Roberts S, Davies GJ, Rose DR, and Goti A. Total syntheses of casuarine and its 6-O-alpha-glucoside: complementary inhibition towards glycoside hydrolases of the GH31 and GH37 families. Chemistry. 2009;15(7):1627-36. DOI:10.1002/chem.200801578 | PubMed ID:19123216 | HubMed [Cardona2009]
  4. Cardona F, Goti A, Parmeggiani C, Parenti P, Forcella M, Fusi P, Cipolla L, Roberts SM, Davies GJ, and Gloster TM. Casuarine-6-O-alpha-D-glucoside and its analogues are tight binding inhibitors of insect and bacterial trehalases. Chem Commun (Camb). 2010 Apr 21;46(15):2629-31. PubMed ID:20461849 | HubMed [Cardona2010]
All Medline abstracts: PubMed | HubMed
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