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The membrane glycoproteins from control (BHK21/C13) and Rous sarcoma virus-transformed (C13/B4) baby hamster kidney cells grown in medium containing [14C]- or D-[3H]glucosamine have been separated into two distinct classes: a phenol-soluble fraction and an aqueous fraction. The membrane glycoproteins from both BHK21/C13 and C13/B4 partitioned similarly into these two fractions. The phenol and aquesous-soluble glycoproteins differed in their sodium dodecyl sulfate-polyacrylamide gel profiles, polyacrylamide isoelectric focusing profiles, and glycopeptide distribution on Sephadex G-50. A number of aqueous and phenol-soluble glycoproteins from BHK21/C13 and C13/B4 cells were purified to near homogeneity by means of polyacrylamide electrophoresis and gel electrofocusing. These glycoproteins range in molecular weight from 179,000 to 31,000 and have isoelectric points of 7.5 to 3.0. Our results show that the pronase glycopeptides of 20 out of 24 homologous membrane glycoproteins of equivalent molecular weight and isoelectric point from BHK21/C13 and C13/B4 cells are dissimilar as measured by Sephadex G-50 gel filtration.
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