The protein subunit of microtubules in eukaryotic cells. Tubulin exists in the
cell as a dimer of α- and β-tubulin, each with a molecular
weight of about 55,000 daltons as determined by electrophoresis. α-Tubulin contains 450 amino acids, with a very acidic Cterminal sequence. β-Tubulin has 445 amino acids with about
42 percent sequence identity with the α-subunit, which suggests a common ancestral origin. The tubulin dimer is associated with two moles of ATP, one at an exchangeable site and
the other at a non-exchangeable site. Under appropriate conditions of temperature, pressure, ionic strength and calcium concentration, tubulin dimers self-assemble to form the cytoplasm
microtubule complex of interphase cells and the spindle of
dividing cells.
TUBULIN Preparation Products And Raw materials
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