1w3j
From Proteopedia
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'''FAMILY 1 B-GLUCOSIDASE FROM THERMOTOGA MARITIMA IN COMPLEX WITH TETRAHYDROOXAZINE''' | '''FAMILY 1 B-GLUCOSIDASE FROM THERMOTOGA MARITIMA IN COMPLEX WITH TETRAHYDROOXAZINE''' | ||
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[[Category: Tarling, C A.]] | [[Category: Tarling, C A.]] | ||
[[Category: Withers, S W.]] | [[Category: Withers, S W.]] | ||
| - | [[Category: | + | [[Category: Enzyme]] |
| - | [[Category: | + | [[Category: Family gh1]] |
| - | [[Category: | + | [[Category: Glucoside hydrolysis]] |
| - | [[Category: | + | [[Category: Hydrolase]] |
| - | [[Category: | + | [[Category: Tetrahydrooxazine]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 13:06:37 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 10:06, 3 May 2008
FAMILY 1 B-GLUCOSIDASE FROM THERMOTOGA MARITIMA IN COMPLEX WITH TETRAHYDROOXAZINE
Overview
The understanding of transition state mimicry in glycoside hydrolysis is increasingly important both in the quest for novel specific therapeutic agents and for the deduction of enzyme function and mechanism. To aid comprehension, inhibitors can be characterized through kinetic, thermodynamic, and structural dissection to build an "inhibition profile." Here we dissect the binding of a tetrahydrooxazine inhibitor and its derivatives, which display Ki values around 500 nm. X-ray structures with both a beta-glucosidase, at 2 A resolution, and an endoglucanase at atomic (approximately 1 A) resolution reveal similar interactions between the tetrahydrooxazine inhibitor and both enzymes. Kinetic analyses reveal the pH dependence of kcat/Km and 1/Ki with both enzyme systems, and isothermal titration calorimetry unveils the enthalpic and entropic contributions to beta-glucosidase inhibition. The pH dependence of enzyme activity mirrored that of 1/Ki in both enzymes, unlike the cases of isofagomine and 1-deoxynojirimycin that have been characterized previously. Calorimetric dissection reveals a large favorable enthalpy that is partially offset by an unfavorable entropy upon binding. In terms of the similar profile for the pH dependence of 1/Ki and the pH dependence of kcat/Km, the significant enthalpy of binding when compared with other glycosidase inhibitors, and the tight binding at the optimal pH of the enzymes tested, tetrahydrooxazine and its derivatives are a significantly better class of glycosidase inhibitor than previously assumed.
About this Structure
1W3J is a Single protein structure of sequence from Thermotoga maritima. Full crystallographic information is available from OCA.
Reference
Structural, thermodynamic, and kinetic analyses of tetrahydrooxazine-derived inhibitors bound to beta-glucosidases., Gloster TM, Macdonald JM, Tarling CA, Stick RV, Withers SG, Davies GJ, J Biol Chem. 2004 Nov 19;279(47):49236-42. Epub 2004 Sep 8. PMID:15356002 Page seeded by OCA on Sat May 3 13:06:37 2008
