[Structural studies on tubulin in flat sheets formed in the presence of zinc].

Structure of the tubulin molecule was determined from microtubule images by methods of three dimensional reconstruction. We detected two types of zinc-induced sheets with different space latticies. Using the model of the tubulin molecule obtained by three dimensional reconstruction, the relationship of its projections was established by the method of optical filtration. Structural peculiarities in tubulin polymorphism are considered.