Immobilization of Malarial (Plasmodium falciparum) Dihydrofolate Reductase for the Selection of Tight-Binding Inhibitors from Combinatorial Library

A simple procedure for selection of tight-binding inhibitors of mutant dihydrofolate reductases from Plasmodium falciparum (PfDHFRs) based on preferential binding to the enzyme immobilized on a Sepharose column has been described. PfDHFRs with a cysteine residue at the C-terminal have been prepared...

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Veröffentlicht in:Analytical chemistry (Washington) 2007-07, Vol.79 (13), p.5006-5012
Hauptverfasser: Thongpanchang, Chawanee, Taweechai, Supannee, Kamchonwongpaisan, Sumalee, Yuthavong, Yongyuth, Thebtaranonth, Yodhathai
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container_issue 13
container_start_page 5006
container_title Analytical chemistry (Washington)
container_volume 79
creator Thongpanchang, Chawanee
Taweechai, Supannee
Kamchonwongpaisan, Sumalee
Yuthavong, Yongyuth
Thebtaranonth, Yodhathai
description A simple procedure for selection of tight-binding inhibitors of mutant dihydrofolate reductases from Plasmodium falciparum (PfDHFRs) based on preferential binding to the enzyme immobilized on a Sepharose column has been described. PfDHFRs with a cysteine residue at the C-terminal have been prepared in order to immobilize to a thiopropyl-Sepharose gel via S−S linkage. The amount of immobilized DHFRs was estimated to be 4−5 mg/g of dried gel, and the activities of bound DHFRs were comparable to that of free enzymes. The prepared immobilized enzyme has been used for the selection of tight-binding inhibitors from combinatorial libraries, based on the affinities of each ligand with the enzyme. Free ligands were then identified and analyzed quantitatively by high-performance liquid chromatography−mass spectrometry, and the components with high binding affinity of the library could thus be realized. Results could be confirmed by quantitative analysis of the bound ligands released from the enzyme by guanidine hydrochloride treatment.
doi_str_mv 10.1021/ac070215s
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PfDHFRs with a cysteine residue at the C-terminal have been prepared in order to immobilize to a thiopropyl-Sepharose gel via S−S linkage. The amount of immobilized DHFRs was estimated to be 4−5 mg/g of dried gel, and the activities of bound DHFRs were comparable to that of free enzymes. The prepared immobilized enzyme has been used for the selection of tight-binding inhibitors from combinatorial libraries, based on the affinities of each ligand with the enzyme. Free ligands were then identified and analyzed quantitatively by high-performance liquid chromatography−mass spectrometry, and the components with high binding affinity of the library could thus be realized. 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subjects Amino Acid Sequence
Analytical chemistry
Animals
Base Sequence
Binding Sites
Biochemistry
Chemistry
Chromatographic methods and physical methods associated with chromatography
Chromatography
Chromatography, High Pressure Liquid - methods
Combinatorial Chemistry Techniques
Cysteine - chemistry
Enzymes
Enzymes, Immobilized
Exact sciences and technology
Folic Acid Antagonists - isolation & purification
Guanidine - pharmacology
Ligands
Mass spectrometry
Mass Spectrometry - methods
Molecular Sequence Data
Other chromatographic methods
Parasitic protozoa
Peptide Library
Plasmodium falciparum
Plasmodium falciparum - enzymology
Plasmodium falciparum - genetics
Reproducibility of Results
Sensitivity and Specificity
Sepharose - chemistry
Spectrometric and optical methods
Sulfhydryl Compounds - chemistry
Sulfides - chemistry
Tetrahydrofolate Dehydrogenase - chemistry
Tetrahydrofolate Dehydrogenase - genetics
Tetrahydrofolate Dehydrogenase - metabolism
title Immobilization of Malarial (Plasmodium falciparum) Dihydrofolate Reductase for the Selection of Tight-Binding Inhibitors from Combinatorial Library
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