Abstract
Tubulin carboxypeptidase was found to be inhibited by myelin basic protein in a concentration dependent manner. The inhibition was produced by the interaction between myelin basic protein with the substrate. As a consequence of this interaction, turbid insoluble aggregates were formed at either 5° or 37°C. The turbidity increased by increasing the myelin basic protein concentration and it reached a plateau at a molar ratio of myelin basic protein to tubulin dimer of about 6. At plateau, the molar ratio in the insoluble aggregates was about 6. When tubulin was in excess, the formation of the insoluble aggregates was diminished. However, if the excess of tubulin was added after the formation of the aggregates, the turbidity was not significantly affected. Turbidity was diminished by increasing the ionic strength.
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