Use of red-shifted dyes in a fluorescence polarization AKT kinase assay for detection of biological activity in natural product extracts

Kinases are an important therapeutic target for drug discovery, and many cancer chemotherapeutic agents have been derived from natural product sources. Natural product samples, however, have the likelihood of assay interference, particularly at elevated test concentrations. The authors developed a c...

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Published inJournal of biomolecular screening Vol. 9; no. 1; pp. 52 - 61
Main Authors Turek-Etienne, Tammy C, Lei, Ming, Terracciano, Joseph S, Langsdorf, Erik F, Bryant, Robert W, Hart, Richard F, Horan, Ann C
Format Journal Article
LanguageEnglish
Published United States 01.02.2004
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Abstract Kinases are an important therapeutic target for drug discovery, and many cancer chemotherapeutic agents have been derived from natural product sources. Natural product samples, however, have the likelihood of assay interference, particularly at elevated test concentrations. The authors developed a competitive fluorescence polarization (FP) assay using red-shifted fluorophores for the AKT kinase and demonstrated utility for testing concentrated natural product extracts. A set of 7 actinomycetes cultures containing indolocarbazoles, known nonselective kinase inhibitors, and a control set of 22 nonproducing indolocarbazole cultures were evaluated. Using red-shifted dyes (Cy3B or Cy5), the authors identified active samples with minimal interference up to the extract concentrations that are 3 times nonextracted culture levels. In contrast, a significant number of interferences were observed using either a fluorescein competitive FP assay or a [33P]ATP Flashplate assay. This work demonstrates that one can screen natural product extracts at high concentrations successfully using FP technology with red-shifted dyes.
AbstractList Kinases are an important therapeutic target for drug discovery, and many cancer chemotherapeutic agents have been derived from natural product sources. Natural product samples, however, have the likelihood of assay interference, particularly at elevated test concentrations. The authors developed a competitive fluorescence polarization (FP) assay using red-shifted fluorophores for the AKT kinase and demonstrated utility for testing concentrated natural product extracts. A set of 7 actinomycetes cultures containing indolocarbazoles, known nonselective kinase inhibitors, and a control set of 22 nonproducing indolocarbazole cultures were evaluated. Using red-shifted dyes (Cy3B or Cy5), the authors identified active samples with minimal interference up to the extract concentrations that are 3 times nonextracted culture levels. In contrast, a significant number of interferences were observed using either a fluorescein competitive FP assay or a [33P]ATP Flashplate assay. This work demonstrates that one can screen natural product extracts at high concentrations successfully using FP technology with red-shifted dyes.
Author Horan, Ann C
Hart, Richard F
Turek-Etienne, Tammy C
Langsdorf, Erik F
Terracciano, Joseph S
Bryant, Robert W
Lei, Ming
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Snippet Kinases are an important therapeutic target for drug discovery, and many cancer chemotherapeutic agents have been derived from natural product sources. Natural...
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StartPage 52
SubjectTerms Biological Factors - metabolism
Chromatography, High Pressure Liquid
Fermentation
Fluorescence Polarization - methods
Fluorescent Dyes - chemistry
Protein-Serine-Threonine Kinases - metabolism
Proto-Oncogene Proteins - metabolism
Proto-Oncogene Proteins c-akt
Spectrophotometry, Ultraviolet
Title Use of red-shifted dyes in a fluorescence polarization AKT kinase assay for detection of biological activity in natural product extracts
URI https://www.ncbi.nlm.nih.gov/pubmed/15006149
Volume 9
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