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A Rapid and Quantitative Fluorimetric Method for Protein-Targeting Small Molecule Drug Screening
Published on: October 16, 2015
The binding of flavopiridol to blood serum albumin
Daniel Myatt1, Louise Johnson, Sonja Baumli
1Diamond Light Source, Harwell Science and Innovation Campus, Chilton, Didcot, Oxfordshire, United Kingdom.
Abstract:
Flavopiridol is a potent cyclin-dependant kinase (CDK) inhibitor and is in clinical trials for anticancer treatment. A limiting factor in its drug development has been the high dosage required in human clinical trials. The high dosage is suggested to be necessary because of significant flavopiridol binding to human blood serum. Albumin is the major protein component of blood serum and has been suggested as a likely high affinity binding target. We characterized the binding of human serum albumin to flavopiridol using circular dichroism (hereafter CD). Flavopiridol bound to human serum albumin has a diagnostic CD binding peak at 284 nm. The diagnostic CD binding peak was unobservable for flavopiridol with bovine serum albumin, using the same experimental conditions. However, under higher albumin concentrations a small CD signal is observed confirming, flavopiridol binds to bovine serum albumin as well.
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