Abstract

Gradient gel electrophoresis was performed under mild detergent conditions to separate pig kidney brush border membrane proteins and to identify the smallest functional molecular protein entity of the d-glucose transporter. The various protein bands obtained from the nondenaturing gel system in a semipreparative scale were eluted by electrodialysis. These proteins were then reintegrated into proteoliposomes and tested for d-glucose-inhibitable [ 3H]phlorizin binding. The d-glucose transporter had a molecular mass of 70 kDa in mild detergent electrophoresis conditions and in subsequent SDS analysis.

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