Self-association of the reduced ApoA-II apoprotein from the human high density lipoprotein complex

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Abstract
The molecular properties of the single linear chain form of human apoA-II, i.e., Cm apoA-II, have been evaluated by circular dichroism, polarization of fluorescence, difference absorption, and sedimentation equilibrium. The self-association of Cm apoA-II to a dimer resembles closely that of apoA-II though the free energy change is somewhat smaller. The dimerization of Cm apoA-II is accompanied by major changes in secondary and tertiary structure. The apoA-II molecule, therefore, represents a molecular association where the intramolecular structure is strongly dependent on the quaternary structure.

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