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Determination of dissociation constants between polyelectrolytes and proteins by affinity capillary electrophoresis
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Biochemistry and Organic Chemistry.
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2009 (English)In: Journal of chromatography. B, ISSN 1570-0232, E-ISSN 1873-376X, Vol. 877, no 10, 892-896 p.Article in journal (Refereed) Published
Abstract [en]

In this manuscript we report the binding affinity between two model proteins, human serum albumin (HSA) and ribonuclease A (RNase A), and negatively charged polyelectrolytes, two different heparin fractions and dextran sulfate, by means of partial filling and affinity capillary electrophoresis. The apparent dissociation constants, K-d, obtained by use of the partial-filling method, between HSA and heparin (17 kDa), heparin (3 kDa) and dextran sulfate (8 kDa) were 33 and 307 mu M, respectively. A new method was developed to determine affinities that take in account different migration directions between the protein and the polyelectrolyte, which was required to study RNase A. By use of this affinity capillary electrophoresis two K-d values were observed for the interaction between RNase A and heparin 17 kDa, yielding a high affinity binding with K-d1 0.0075 mu M, and a lower affinity binding with K-d2 8.7 mu M. For dextran sulfate 8 kDa these K-d values were 0.027 and 10.4 mu M, respectively. Heparin 3 kDa only showed a single K-d value of 0.52 mu M. The results show that the magnitude of the binding affinity depends on the type of polyelectrolyte and its molecular weight. (C) 2009 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
2009. Vol. 877, no 10, 892-896 p.
Keyword [en]
Dissociation constant, Polyelectrolytes, Heparin, Dextran sulfate, Human serum albumin, Capillary electrophoresis, Ribonuclease A, RNase, Partial filling, Affinity, Binding
National Category
Chemical Sciences
URN: urn:nbn:se:uu:diva-129121DOI: 10.1016/j.jchromb.2009.02.021ISI: 000265130100006OAI: oai:DiVA.org:uu-129121DiVA: diva2:337685
Available from: 2010-08-09 Created: 2010-08-05 Last updated: 2010-08-09Bibliographically approved

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Department of Biochemistry and Organic Chemistry
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Journal of chromatography. B
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