The Extent of Hydrophobic Binding Area Studied by Fatty Acid Binding to Albumin
Affinity constants of six consecutive fatty acids, propionic to caprylic, for the specific binding site on albumin have been determined at two temperatures. The standard free energy change of binding, ΠG °, deduced from the affinity constants, appears not to increase linearly with increasing chai...
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Published in | Molecular pharmacology Vol. 12; no. 3; pp. 454 - 462 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
United States
American Society for Pharmacology and Experimental Therapeutics
01.05.1976
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Subjects | |
Online Access | Get full text |
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Summary: | Affinity constants of six consecutive fatty acids, propionic to caprylic, for the specific
binding site on albumin have been determined at two temperatures. The standard free
energy change of binding, ΠG °, deduced from the affinity constants, appears not to
increase linearly with increasing chain length; a plateau is reached at valeric acid, andÎ
G ° increases further only at heptanoic acid. The mean increment in ΠG ° per methylene
group amounts to 820 cal, indicating that the hydrophobic interaction of the alkyl chain
of the fatty acid with the specific binding site is quite optimal. The occurrence of the
plateau has been interpreted as being a consequence of the limiting extent of the
hydrophobic binding area forming part of the specific binding site for fatty acids on
albumin. As the position of the plateau seems to coincide with that in other work, using
other systems, the limiting extent of the hydrophobic binding area might be a general
feature of proteins. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0026-895X 1521-0111 |