Specific volume and compressibility of human serum albumin–polyanion complexes

The ultrasound velocimetry, densitometry, and differential scanning calorimetry have been used to study the formation of the complexes between human serum albumin (HSA) and polyanions heparin (HEP) and/or dextran sulfate (DS). Adiabatic compressibility and phase transition temperature of HSA decreas...

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Bibliographic Details
Published in:Bioorganic & medicinal chemistry letters 2006-01, Vol.16 (2), p.274-279
Main Authors: Hianik, Tibor, Poniková, Slavomíra, Bágel’ová, Jaroslava, Antalík, Marián
Format: Article
Language:English
Subjects:
Biological and medical sciences
Calorimetry, Differential Scanning
Carbohydrate Conformation
Carbohydrate Sequence
Compressibility
Densitometry
Dextran sulfate
Dextran Sulfate - chemistry
Differential scanning calorimetry
General pharmacology
Heparin
Heparin - chemistry
Human serum albumin
Humans
Hydrogen-Ion Concentration
Medical sciences
Miscellaneous
Molecular Sequence Data
Molecular Weight
Pharmacology. Drug treatments
Polyanion–protein complexes
Polymers - chemistry
Serum Albumin - chemistry
Specific volume
Temperature
Ultrasonography, Doppler
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Summary:The ultrasound velocimetry, densitometry, and differential scanning calorimetry have been used to study the formation of the complexes between human serum albumin (HSA) and polyanions heparin (HEP) and/or dextran sulfate (DS). Adiabatic compressibility and phase transition temperature of HSA decreased with increasing concentration of HEP (1) and DS (2). Changes of compressibility can be caused by increase of the hydration due formation of the HSA–polyanion complexes and due to partial unfolding of HSA. HEP more strongly interacts with HSA then DS. The ultrasound velocimetry, densitometry, and differential scanning calorimetry have been used to study the formation of the complexes between human serum albumin (HSA) and polyanions heparin (HEP) and/or dextran sulfate (DS). The values of the ultrasound velocity and specific volume allowed us to determine the specific adiabatic compressibility, ϕ K/ β 0, which reflects the degree of volume compressibility of the complexes. We showed that in the presence of HEP and DS the adiabatic compressibility of HSA decreases with increasing concentration of polyanions. HEP more strongly interacts with HSA than DS. pH of electrolyte in the range 4.7–8.5 weakly affects the adiabatic compressibility. Changes of compressibility of HSA can be caused by increase of the hydration due to the formation of the HSA–polyanion complexes and due to partial unfolding of HSA. The HSA–polyanion interaction resulted in decrease of phase transition temperature of the protein. This evidences about protein destabilization in the presence of polyanions.
ISSN:0960-894X
1464-3405
DOI:10.1016/j.bmcl.2005.10.010