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Heterogeneity of Human Cell Membrane Sialoglycoproteins

Overview
Journal Blut
Specialty Hematology
Date 1976 Mar 1
PMID 1252623
Citations 15
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Abstract

Discontinuous sodium dodecysulfate polyacrylamide gel electrophoresis (disc SDS-PAGE) followed by periodic acid/Schiff staining reveals the presence of six sialoglycoprotein bands in human red cell membranes or glycoprotein preparations therefrom. In agreement with previous investigations it is shown that PAS-1 and PAS-2 (mol. weight 37 000) are different forms of the same molecule (MN glycoprotein). Using separation of glycoproteins by the system of Weber and Osborn and reelectrophoresis of gel slices by disc SDS-PAGE it is demonstrated that the minor component C (mol. weight 41 000) represents the dimeric form of PAS-3 (Ss glycoprotein). Band B corresponds to an aggregate of PAS-3 and PAS-2 and/or the trimer of PAS-3 with possible differences between extracted glycoproteins and those present in the membrane. The minor component D (mol. weight 35 000) is, as far as could be elucidated, not involved in aggregation phenomena. Some technical problems of glycoprotein fractionation by SDS-PAGE and the remarkable effect of phosphate buffers on the glycoprotein pattern are discussed.

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