The Relation of Size to the Relative Rates of Degradation of Intestinal Brush Border Proteins

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Abstract

Proteins associated with intestinal brush borders and their various fractions were solubilized with sodium dodecyl sulfate and β-mercaptoethanol, and separated by electrophoresis on acrylamide gels containing sodium dodecyl sulfate. Brush borders contain at least 15 proteins or subunits, ranging in molecular weight from 19,000 to 270,000. The largest proteins (170-270,000 mol wt), including the disaccharidases, are removed from the brush borders by papain. Proteins belonging to the remaining membrane, including alkaline phosphatase, have an intermediate size (53-140,000 mol wt). The proteins corresponding to the filamentous “core” of the microvilli are the smallest (19-45,000).

Authors

David H. Alpers