[No authors listed]
Bovine myelin/oligodendrocyte glycoprotein (MOG) was purified from a Wolfgram protein fraction of brain myelin by molecular sieving and preparative gel electrophoresis. The N-terminal sequence of this wheat germ agglutinin reacting glycoprotein was determined. Antibodies against purified MOG and synthetic N-terminal octapeptide of MOG were produced in rabbits. Respective affinity purified antibody preparations gave identical results on Western blots. Treatment with specific glycosidases indicated that the oligosaccharide chains of MOG are only of N-chain type. This glycoprotein seems to be restricted to mammalian species since it was not detected in other animal species, ranging from fish up to reptiles. Immunohistochemical investigations on rat brain sections revealed that MOG is restricted to myelin sheaths and oligodendrocytes, thus corroborating previous results obtained with the MOG 8-18C5 monoclonal antibody. Decreased staining pattern in Jimpy brain further attested its specific localization in myelin-related structures. The octapeptide site-specific antibodies were not reactive on brain sections which may be attributed to the burying of this N-terminal sequence in the membrane. These MOG polyclonal antibodies appear to be valuable tools for further studies concerning this minor glycoprotein.
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