Intermediate filaments from squid brain tissue were reassembled in vitro and purified by two cycles of assembly and disassembly. Purified squid brain filaments contained one major polypeptide (60,000 daltons), which constituted about 70 percent of the total protein, and three minor polypeptides (74,000, 100,000, and 220,000 daltons). Squid brain intermediate filaments were reconstituted from rod-shaped protofilamentous subunits. In addition to the intermediate filaments, dense bodies which may function in intermediate filament nucleation or organization were retained through two purification cycles.
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