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Chromaffin-granule membranes were separated into insoluble and soluble fractions after extraction with lithium di-iodosalicylate (LDIS). These fractions were characterized by one- and two-dimensional gel electrophoresis, and glycoproteins were detected after electroblotting with peroxidase-labelled concanavalin A and wheat-germ agglutinin (WGA). The LDIS-insoluble fraction contained components identified as glycoproteins III, H, J and K (carboxypeptidase H). Microsequence analysis indicated that component J is an N-terminally extended form of glycoprotein K. A major glycoprotein, GpII (Mr 80,000-100,000), present in the LDIS-soluble fraction was purified by affinity chromatography on WGA-Sepharose. This was characterized by one- and two-dimensional gel electrophoresis with Coomassie Blue staining, by amino acid analysis and automated N-terminal sequence analysis. Extraction of chromaffin-granule membranes with LDIS is a simple and rapid procedure that facilitates studies concerned with the structure and function of membrane glycoproteins from these and other secretory granules.

biochemical journal

Identification and characterization of glycoproteins after extraction of bovine chromaffin-granule membranes with lithium di-iodosalicylate. Purification of glycoprotein II from the soluble fraction