home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Collection of Education
/
collectionofeducationcarat1997.iso
/
HEALTH
/
MED9601.ZIP
/
M9610042.TXT
< prev
next >
Wrap
Text File
|
1996-01-30
|
2KB
|
41 lines
Document 0042
DOCN M9610042
TI A general, wide-rage spectrofluorometric method for measuring the
site-specific affinities of drugs toward human serum albumin.
DT 9601
AU Epps DE; Raub TJ; Kezdy FJ; Upjohn Laboratories, Kalamazoo, Michigan
49001, USA.
SO Anal Biochem. 1995 May 20;227(2):342-50. Unique Identifier : AIDSLINE
MED/96023416
AB Binding of drugs to serum albumin is one of the most important
pharmacokinetic determinants and the design of drugs should take
advantage of this property. In the present work, the fluorescent ligands
Warfarin and dansylsulfonamide were used as probes of IIA site of human
albumin and dansylsarcosine as the probe of the IIIA site. From the
changes in fluorescence upon binding at 37 degrees C, pH 7.4, the
following dissociation constants were determined: Warfarin, 3.43 +/-
0.69 microM; dansylsulfonamide, 7.57 +/- 0.88 microM; and
dansylsarcosine, 6.06 +/- 1.09 microM. Nonfluorescent ligands displace
these probes competitively and the type of probe displaced identifies
the site specificity of the ligands. Nonlinear least-squares analysis of
the decrease in fluorescence accompanying the displacement yields the
stoichiometry and the dissociation constant may also be estimated
rapidly from displacement at a single competitor concentration. The
method yields reliable Kd values for at least the range of 0.2 to 100
microM. Representative dissociation constants for the IIA site-specific
ligands are as follows: phenylbutazone, 1.9 +/- 0.3 microM; U-99,499,
1.8 +/- 0.2 microM; U-96,988, 5.3 +/- 1.5 microM; and U-105,665, 42 +/-
7 microM. For the IIIA site we find the following Kd values: oxazepam,
27.7 +/- 2.1 microM; diazepam, 7.7 +/- 1.0 microM; and ibuprofen, 2.7
+/- 1.2 microM. The method is eminently suitable for large-scale
screening.
DE Binding Sites Binding, Competitive Dansyl
Compounds/CHEMISTRY/*PHARMACOKINETICS Fluorescent Dyes Human HIV
Protease Inhibitors/CHEMISTRY/*PHARMACOKINETICS Least-Squares Analysis
Serum Albumin/*CHEMISTRY Spectrometry, Fluorescence/*METHODS
Warfarin/CHEMISTRY/*PHARMACOKINETICS JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).