Mutational Analysis of the Binding of Alternative Substrates and Inhibitors to the Active Site of Human Glutathione Transferase P1–1
| Autor: | Aram Ismail, Usama M. Hegazy, Abeer Shokeer, Rüdiger H. Kolm, Bengt Mannervik |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
chemistry.chemical_classification
0303 health sciences biology Process Chemistry and Technology Active site Bioengineering Glutathione 010501 environmental sciences medicine.disease_cause 01 natural sciences Amino acid 03 medical and health sciences chemistry.chemical_compound Enzyme chemistry Biochemistry Glycine biology.protein medicine Thiol Chemical Engineering (miscellaneous) Xenobiotic Escherichia coli 030304 developmental biology 0105 earth and related environmental sciences |
| Zdroj: | Processes. 8:1232 |
| ISSN: | 2227-9717 |
| Popis: | Glutathione transferases (GSTs) are enzymes that play a critical role in cellular detoxication by catalyzing the nucleophilic attack of glutathione on the electrophilic center of a number of xenobiotic compounds, including many therapeutic drugs. Mutations of amino acid residues in the glutathione-binding site of human glutathione transferase P1–1, namely W39C, K45A, Q52A, Q52K, and Q52E, have been engineered. The recombinant mutant proteins were expressed in Escherichia coli, but only mutants K45A, Q52A, and Q52K showed measurable activity. Steady-state kinetics comparing glutathione with the alternative thiol substrate γ-glutamylcysteine demonstrated the importance of the glycine residue in glutathione for high catalytic efficiency. Inhibition experiments with a set of glutathione analogs structurally related to the therapeutic drugs Telintra and Telcyta enabled determination of binding energies that were contributed by different substituents. The effects of substituting amino acid side chains in the glutathione-binding site of the enzyme on binding the glutathione derivatives and catalysis were evaluated. |
| Databáze: | OpenAIRE |
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