Abstract
Five monoclonal antibodies against N-terminal domains of α- or β-tubulin were tested for their ability to interfere with the in vitro formation of microtubules. Although all the antibodies exhibited similar association constants for immobilized tubulin, they differed in their inhibitory effect on microtubule assembly. For the most potent antibody, TU-13, the antibody/tubulin molar ratio of about 1:320 was sufficient for a 50% inhibition. The data indicate that the surface regions of N-terminal domains of tubulin are involved in the formation of microtubules.
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