Randomized trial demonstrates microtubule polymerization in solutions with low calcium, suggesting regulation mechanisms.
Isolated rat brain tubulin can be repolymerized in vitro in solutions containing adenosine triphosphate or guanosine triphosphate, magnesium ions, and a good calcium chelator. The extreme sensitivity of tubulin to calcium ions explains the failure of previous efforts to obtain polymerization and suggests a possible mechanism for regulation of microtubule polymerization in vivo.
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Richard C. Weisenberg (1972) studied this question.
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