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Multivalent interaction between asialofetuin and plasma membrane preparations from the rat liver.

M T Debanne, E Regoeczi, M W Hatton

Canadian Journal of Biochemistry

|December 1, 1980

Summary

Rat liver plasma membranes exhibit heterogeneous binding of asialofetuin, influenced by temperature. This functional heterogeneity in glycoprotein binding is concentration-dependent.

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Area of Science:

Biochemistry
Cell Biology
Membrane Biology

Background:

Bovine asialofetuin is a glycoprotein recognized by hepatic lectins.
Rat liver plasma membranes contain receptors for asialofetuin.
Understanding glycoprotein-membrane interactions is crucial for cellular processes.

Purpose of the Study:

To investigate the binding characteristics of bovine asialofetuin to rat liver plasma membranes.
To elucidate the nature of binding heterogeneity and its dependence on experimental conditions.

Main Methods:

Utilized various techniques for separating free and bound glycoprotein.
Employed different methods to quantify nonspecific binding.
Analyzed binding data using Scatchard plots at different incubation temperatures (4°C and 22°C).

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Main Results:

Membrane preparations exhibited typical characteristics of rat liver plasma membranes.
Binding capacity was determined to be approximately 15 pmol of asialofetuin per milligram of membrane protein.
Nonlinear Scatchard plots at 22°C indicated heterogeneity in binding, which became linear at 4°C.

Conclusions:

The observed nonlinearity in binding at 22°C suggests functional, not chemical, heterogeneity.
This heterogeneity is attributed to competition among galactose groups for binding sites on hepatic lectins.
The degree of binding is dependent on the concentration of asialofetuin in the incubation mixture.