Abstract
Myelin basic protein has been isolated from bovine central-nervous-system myelin by four methods, none of which exposes the protein to acid. After purification the inositol content of both hydrolysed and unhydrolysed protein was quantified by g.c.-m.s. Basic protein prepared by all methods contained less than 4 mol % of inositol. It is concluded, contrary to a previous proposal, that covalent binding to phosphoinositides does not represent a general mechanism for attachment of this cytoplasmically-oriented protein to its membrane.
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- Bizzozero O. A., Lees M. B. Fatty acid acylation of rat brain myelin proteolipid protein in vitro: identification of the lipid donor. J Neurochem. 1986 Feb;46(2):630–636. doi: 10.1111/j.1471-4159.1986.tb13013.x. [DOI] [PubMed] [Google Scholar]
- Chang P. C., Yang J. C., Fujitaki J. M., Chiu K. C., Smith R. A. Covalent linkage of phospholipid to myelin basic protein: identification of serine-54 as the site of attachment. Biochemistry. 1986 May 6;25(9):2682–2686. doi: 10.1021/bi00357a059. [DOI] [PubMed] [Google Scholar]
- Drummond R. J., Hamill E. B., Guha A. Purification and comparison of 2',3'-cyclic nucleotide 3'-phosphohydrolases from bovine brain and spinal cord. J Neurochem. 1978 Oct;31(4):871–878. doi: 10.1111/j.1471-4159.1978.tb00122.x. [DOI] [PubMed] [Google Scholar]
- Ferguson M. A., Low M. G., Cross G. A. Glycosyl-sn-1,2-dimyristylphosphatidylinositol is covalently linked to Trypanosoma brucei variant surface glycoprotein. J Biol Chem. 1985 Nov 25;260(27):14547–14555. [PubMed] [Google Scholar]
- Futerman A. H., Low M. G., Ackermann K. E., Sherman W. R., Silman I. Identification of covalently bound inositol in the hydrophobic membrane-anchoring domain of Torpedo acetylcholinesterase. Biochem Biophys Res Commun. 1985 May 31;129(1):312–317. doi: 10.1016/0006-291x(85)91439-1. [DOI] [PubMed] [Google Scholar]
- Garwood M. M., Gilbert W. R., Agrawal H. C. In vivo acylation of proteolipid protein and DM-20 in myelin and myelin subfractions of developing rat brain: immunoblot identification of acylated PLP and DM-20. Neurochem Res. 1983 May;8(5):649–659. doi: 10.1007/BF00964704. [DOI] [PubMed] [Google Scholar]
- LOWRY O. H., ROSEBROUGH N. J., FARR A. L., RANDALL R. J. Protein measurement with the Folin phenol reagent. J Biol Chem. 1951 Nov;193(1):265–275. [PubMed] [Google Scholar]
- Laemmli U. K. Cleavage of structural proteins during the assembly of the head of bacteriophage T4. Nature. 1970 Aug 15;227(5259):680–685. doi: 10.1038/227680a0. [DOI] [PubMed] [Google Scholar]
- Lapin E. P., Maker H. S., Schipper H. I., Weiss C., Lehrere G. M. Non-protein constituents in myelin basic protein preparations. J Neurochem. 1976 Jun;26(6):1289–1291. doi: 10.1111/j.1471-4159.1976.tb07021.x. [DOI] [PubMed] [Google Scholar]
- Low M. G., Futerman A. H., Ackermann K. E., Sherman W. R., Silman I. Removal of covalently bound inositol from Torpedo acetylcholinesterase and mammalian alkaline phosphatases by deamination with nitrous acid. Evidence for a common membrane-anchoring structure. Biochem J. 1987 Jan 15;241(2):615–619. doi: 10.1042/bj2410615. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Sherman W. R., Packman P. M., Laird M. H., Boshans R. L. Measurement of myo-inositol in single cells and defined areas of the nervous system by selected ion monitoring. Anal Biochem. 1977 Mar;78(1):119–131. doi: 10.1016/0003-2697(77)90015-x. [DOI] [PubMed] [Google Scholar]
- Ulmer J. B., Braun P. E. In vivo phosphorylation of myelin basic proteins in developing mouse brain: evidence that phosphorylation is an early event in myelin formation. Dev Neurosci. 1983;6(6):345–355. doi: 10.1159/000112361. [DOI] [PubMed] [Google Scholar]
- Yang J. C., Chang P. C., Fujitaki J. M., Chiu K. C., Smith R. A. Colvalent linkage of phospholipid to myelin basic protein: identification of phosphatidylinositol bisphosphate as the attached phospholipid. Biochemistry. 1986 May 6;25(9):2677–2681. doi: 10.1021/bi00357a058. [DOI] [PubMed] [Google Scholar]