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An analysis of the regions of the myelin basic protein that bind to phosphatidylcholine

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Abstract

The interactions of phosphatidylcholine (PC) to regions of the myelin basic protein (MBP) was examined. In solid phase binding assays the nature of the binding of unilamellar vesicles of14C-labeled phosphatidylcholine to bovine 18.5 kDa MBP, its N- and C-terminal peptide fragments, photooxidized 18.5 kDa MBP and the mouse 14 kDa protein, with an internal deletion of residues 117–157, was studied. The data were analyzed by computer-generated Scatchard plots in which non-specific binding was eliminated. Non-cooperative, low affinity binding of PC vesicles to MBP was observed, and this binding found to be sensitive to pH and ionic changes. At an ionic strength of 0.1 and pH 7.4, the binding of PC to the 14 kDa mouse MBP exhibited a Kd similar to that obtained with both the N-terminal and photooxidized 18.5 kDa bovine MBP. The studies indicated that the sites of PC interaction with MBP are located in the N-terminal region of the protein. The C-terminal region appeared to modulate the strength of the interaction slightly. Under similar conditions, lysozyme did not bind PC liposomes, and histone bound them nonspecifically.

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Author notes

  1. Nirmala K. Menon

    Present address: Huntington Medical Research Institute, 734 Fairmont Avenue, 91105, Pasadena, CA

Authors and Affiliations

  1. Mental Retardation Research Center, University of California, Los Angeles, 90024, Los Angeles, CA

    Nirmala K. Menon, Kathy Kampf & Anthony T. Campagnoni

  2. Molecular Biology Institute, University of California, 90024, Los Angeles, CA

    Robert E. Williams

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  1. Nirmala K. Menon
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  2. Robert E. Williams
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  3. Kathy Kampf
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  4. Anthony T. Campagnoni
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Menon, N.K., Williams, R.E., Kampf, K. et al. An analysis of the regions of the myelin basic protein that bind to phosphatidylcholine. Neurochem Res 15, 777–783 (1990). https://doi.org/10.1007/BF00968554

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