Mar 18, 1976

A study of Folch-Pi apoprotein. II. Relation between polymerization state and conformation

Biochimica Et Biophysica Acta
T N LeM D Barratt


A comparison of the conformation of Folch-Pi apoprotein in organic solvent and in aqueous solutions has been made by ESR, infrared and circular dichroism spectroscopy studies. Electrophoresis and ultracentrifugation have been carried out in order to correlate molecular weight and charge of the molecule with its conformation. It appears that the protein is monomeric in organic solution. In water, only one component is present but the molecules behave as a polydisperse system of associating molecules. Hydrophobic interacitons seem to be important for this polymerisation which does not appear to be accompanied by the formation of beta-structure. After the transfer of the protein from organic solution to water, the ESR spectra of the protein labelled on the free SH groups show an heterogeneity in the motional environment of the label which permits to assume that different areas of association exist in the polymeric molecule.

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Mentioned in this Paper

Macromolecular Compounds
Spin Labels
Plasma Protein Binding Capacity
Organic solvent product
Protein Conformation

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