Abstract
Chromatographic studies were performed to measure myelin basic protein (MBP) interactions by covalently binding a number of different proteins to Sepharose and passing radioactive bovine MBP over these columns. Studies at a variety of pH values, ionic strengths and temperatures revealed that the bovine MBP could interact with itself as well as cytochrome c, lysozyme, and ovalbumin. Chromatographic profiles of elution volume vs. pH revealed that the interaction between MBP and these immobilized proteins was biphasic. The self-association of MBP was found to be strongest between pH 7.4 and 8.1 and at an elevated temperature. Titration of the amino acid residues responsible for the association of MBP with other proteins revealed apparent pKs ranging from 6.10 to 6.70. A pH dependence study at an elevated temperature shifted the apparent pK of the MBP interaction to a lower value with all the proteins except ovalbumin. After destroying 60% of the histidine residues in MBP by photooxidation and passing125I-labeled photooxidized MBP over Sepharose columns containing immobilized protein, the second phase in binding was decreased significantly with immobilized cytochrome c, lysozyme, and MBP and to a smaller extent with ovalbumin. These results are consistent with the involvement of deprotonated histidine residues in the MBP-protein associations.
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Moskaitis, J.E., Shriver, L.C. & Campagnoni, A.T. The association of myelin basic protein with itself and other proteins. Neurochem Res 12, 409–417 (1987). https://doi.org/10.1007/BF00972291
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DOI: https://doi.org/10.1007/BF00972291