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. 1976 Jan 1;153(1):93–100. doi: 10.1042/bj1530093

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

M S Wooster, J M Wrigglesworth
PMCID: PMC1172545  PMID: 4058

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 glyceraldehyde 3-phosphate dehydrogenase binds to condensed charged monolayers by multiple electrostatic interactions. At low concentrations of phosphatidic acid in the monolayer or in the presence of Ca2+, this occurs in a two-step process and depends on lateral diffusion of phosphatidic acid for strong binding to take place.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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