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A simple stochastic model which describes microtubule dynamics and explicitlytakes into account the relevant biochemical processes is presented. The modelincorporates binding and unbinding of monomers and random phosphate releaseinside the polymer. It is shown that this theoretical approach provides amicroscopic picture of the dynamic instability phenomena of microtubules. Thecap size, the concentration dependence of the catastrophe times and the delaybefore observing catastrophes following a dilution can be quantitativelypredicted by this approach in a direct and simple way. Furthermore, the modelcan be solved analytically to a large extend, thus offering a valuable startingpoint for more refined studies of microtubules dynamics.

The random release of phosphate controls the dynamic instability of microtubules