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- W2026355265 abstract "Cranin was described in 1987 as a membrane glycoprotein expressed in brain and many other tissues, which binds laminin with high affinity in a calcium-dependent manner. Dystrophin-associated glycoprotein (“dystroglycan”) is a laminin-binding protein cloned in 1992 whose relation to cranin has remained uncertain. Here we describe the purification of cranin to homogeneity from sheep brain, show cranin to be a form of dystroglycan, and localize the N terminus of β-dystroglycan to amino acid residue 654. We find that brain α-dystroglycan is tightly associated with membranes, and localizes to regions of synaptic contact as assessed by immunocytochemistry of rat cerebellum. Brain α-dystroglycan expresses high mannose/hybrid N-linked saccharides, terminal GalNAc residues, and the HNK-1 epitope. Although dystroglycan has previously been presumed to be a proteoglycan, the amino acid sequence, pI, O-sialoglycoprotease susceptibility, lectin-binding profile, and laminin-binding properties of brain dystroglycan are more typical of mucin-like proteins. Furthermore, using CHO mutant cell lines deficient in xylosyltransferase and galactosyltransferase I, which are required for glycosaminoglycan biosynthesis, it is shown that chondroitin sulfate and heparan sulfate are not critical for laminin binding, and indeed are apparently not expressed at all in dystroglycan from CHO cells. Cranin was described in 1987 as a membrane glycoprotein expressed in brain and many other tissues, which binds laminin with high affinity in a calcium-dependent manner. Dystrophin-associated glycoprotein (“dystroglycan”) is a laminin-binding protein cloned in 1992 whose relation to cranin has remained uncertain. Here we describe the purification of cranin to homogeneity from sheep brain, show cranin to be a form of dystroglycan, and localize the N terminus of β-dystroglycan to amino acid residue 654. We find that brain α-dystroglycan is tightly associated with membranes, and localizes to regions of synaptic contact as assessed by immunocytochemistry of rat cerebellum. Brain α-dystroglycan expresses high mannose/hybrid N-linked saccharides, terminal GalNAc residues, and the HNK-1 epitope. Although dystroglycan has previously been presumed to be a proteoglycan, the amino acid sequence, pI, O-sialoglycoprotease susceptibility, lectin-binding profile, and laminin-binding properties of brain dystroglycan are more typical of mucin-like proteins. Furthermore, using CHO mutant cell lines deficient in xylosyltransferase and galactosyltransferase I, which are required for glycosaminoglycan biosynthesis, it is shown that chondroitin sulfate and heparan sulfate are not critical for laminin binding, and indeed are apparently not expressed at all in dystroglycan from CHO cells." @default.
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- W2026355265 date "1995-06-01" @default.
- W2026355265 modified "2023-10-18" @default.
- W2026355265 title "Purification of Cranin, a Laminin Binding Membrane Protein" @default.
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- W2026355265 doi "https://doi.org/10.1074/jbc.270.25.15425" @default.
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