Intermediate filaments are made from elongated fibrous proteins that are assembled into a ropelike structure. Figure Q17-10 shows the structure of an intermediate filament subunit. You are interested in how intermediate filaments are formed, and you create an intermediate filament subunit whose a-helical region is twice as long as that of a normal intermediate filament by duplicating the normal a-helical region while keeping a globular head at the N-terminus and a globular tail at the C-terminus; you call this subunit IFad. If you were to assemble intermediate filaments using IFad as the subunit, which of the following predictions describes the most likely outcome?
(a) Filaments assembled using IFad will interact with different cytoskeletal components.
(b) Filaments assembled using IFad will form dimers that are twice as long as dimers assembled from normal intermediate filaments.
(c) Sixteen tetramers assembled from IFad will be needed for a ropelike structure to form.
(d) Dimers of IFad will form by interactions with the N-terminal globular head and the C-terminal globular tail.
Answer:
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