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Study of Non-Covalent Enzyme-Inhibitor Complexes of Aldose Reductase by Electrospray Mass Spectrometry
Abstract
Specific non-covalent interactions between aldose reductase (AR), its NADP+ cofactor and five inhibitors have been characterized by electrospray mass spectrometry (ES-MS). These results indicated that the protein could be desorbed and maintained in the gas phase in a form very close to its native conformation. Collisionally induced dissociation (CID)-MS and CID-MS-MS showed that the adenosine diphospbate part of the cofactor interacts strongly with AR. The relative stability of the ternary AR NADP+ inhibitor complexes was established and successfully correlated with the IC50, values. All inhibitors were shown to only bind to AR holoenzyme. These results are important for the field of drug development insofar as ES-MS might provide a rapid and very sensitive method for the screening of potential drugs or for the identification of compounds displaying high binding affinity to a target biomolecule.
Abbreviations
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- ES-MS
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- electrospray mass spectrometry
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- AR
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- aldose reductase
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- CID-MS
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- collisionally induced dissociation-mass spectrometry
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- CID-MS-MS
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- collisionally induced dissociation-mass spectrometry-mass spectrometry
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- FTICR
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- Fourier-transform ion-cyclotron resonance
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- ADP-RibP.
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- 2′-monophosphoadenosine-5′-diphosphoribose
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- IC50
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- concentration of inhibitor required to produce 50% inhibition of enzyme activity
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- IE50
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- number of equivalent of inhibitor leading to a decrease of 50% of enzyme activity
Enzymes
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- Aldose reductase (E. C. 1.1.1.21)
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- yeast alcohol dehydrogenase (E. C. 1.1.1.1)