Jan 1, 1976

Adsorption of glyceraldehyde 3-phosphate dehydrogenase on condensed monolayers of phospholipid

The Biochemical Journal
M S Wooster, J M Wrigglesworth

Abstract

The adsorption of [14C] alkylated glyceraldehyde 3-phosphate dehydrogenase from rabbit muscle to condensed monolayers of phosphatidic acid was investigated under a variety of conditions. 2. The rate constant for association at 20 degrees C depended on ionic strength. At I/2=60mM the rate constant was 0.39min-1. At I/2=260mM it decreased to 0.27min-1. 3. The apparent association constant (Kass.) for adsorption at I/2=60mM was 1.06 X 10(6)M-1 and was strongly influenced by subphase changes in pH and ionic strength. Measurements of Kass. at 20 degrees and 5 degrees C gave a value for the apparent enthalpy change on adsorption of -33kJ-mol-1. Calculations of the apparent change in free energy and apparent entropy change for the adsorption process gave values of -34kJ-mol-1 and +2J-K-1-mol-1 respectively. 4. Decreasing the amount of phosphatidic acid in the monolayer by replacement with phosphatidylcholine caused the shape of the adsorption isotherm to change from apparent hyperbolic to sigmoid. Subphase changes in pH or ionic strength did not affect the shape of the adsorption isotherm. However, adsorption of enzyme on monolayers of 100% phosphatidic acid in the presence of 1mM-CaCl2 was sigmoid in nature. 5. It is concluded that g...Continue Reading

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Mentioned in this Paper

Thermodynamics
Sigmoid Colon
Adsorption
Phosphatidylcholines
Phosphatidic Acid
Slow-K
Binding (Molecular Function)
Phospholipids
GAPDHS
Glyceraldehyde-3-Phosphate Dehydrogenases

About this Paper

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