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Studies On Inactivation Of Lipoprotein Lipase: Role Of The Dimer To Monomer Dissociation.

J. Osborne, G. Bengtsson-Olivecrona, N. Lee, T. Olivecrona
Published 1985 · Chemistry, Medicine

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Sedimentation equilibrium analysis demonstrated that preparations of bovine lipoprotein lipase contain a complex mixture of dimers and higher oligomers of enzyme protein. Enzyme activity profiles from sedimentation equilibrium as well as from gel filtration indicated that activity is associated almost exclusively with the dimer fraction. To explore if the enzyme could be dissociated into active monomers, 0.75 M guanidinium chloride was used. Sedimentation velocity measurements demonstrated that this treatment led to dissociation of the lipase protein into monomers. Concomitant with dissociation, there was an irreversible loss of catalytic activity and a moderate change in secondary structure as detected by circular dichroism. The rate of inactivation increased with decreasing concentrations of active lipase, but addition of inactive lipase protein did not slow down the inactivation. This indicates that reversible interactions between active species precede the irreversible loss of activity. The implication is that dissociation initially leads to a monomer form which is in reversible equilibrium with the active dimer, but which decays rapidly into an inactive form, and is therefore not detected as a stable component in the system.
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