How is ATP used in the regulation of intermediate filaments? Addition of 8 tetramers to a growing filament Filament disassembly Formation of a staggered tetramer of two coiled-coil dimers ATP is not used in the regulation of intermediate filaments O Formation of a coiled-coil dimer
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A:
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- Neurofilament proteins assemble into long, intermediate filaments , found in abundance running along the length of nerve cell axons. The C-terminal region of these proteins is an unstructured polypeptide, hundreds of amino acids long and heavily modified by the addition of phosphate groups. The term “polymer brush” has been applied to this part of the neurofilament. can you suggest why?Which of the following are differences between the assembly processes of intermediate filaments versus that of actin microfilaments? A. New subunits are added internally to the intermediate filament rather than at the ends B. Assembly requires GTP rather than ATP C. Intermediate filaments are assembled from multiple tetramers rather than from monomers. D. A and B E. A and CWhy is it that intermediate filaments have iden-tical ends and lack polarity, whereas actin filaments andmicrotubules have two distinct ends with a defined polar-ity?
- Explain how the structure of intermediate filaments makes them better suited to provide mechanical strength than either microtubules or actin filaments.?What triggers the movement of the thin filament? Is it because of the high --> low energy configuration? The exact mechanism is confusing to me.ATP within actin subunits is hydrolyzed after assembly into a filament but before disassembly from a filament. in theprocess of assembly into a filament. in the process of disassociation from a filament after disassociation from a filament
- What would be the consequence for actin filament assembly/disassembly if a mutation prevented actin’s ability to bind ATP? What would be the consequence if a mutation prevented actin’s ability to hydrolyze ATP?During the cross-bridge in muscle cells, myosin motors hydrolyzes ATP as a fuel to create a pulling force on actin fibers. Please describe1) the myosin motors undergo different steps of ATP hydrolysis2) the state of the ATP nucleotide affects the binding and position of the myosin motor with respect to the actin fiberThere are no known motor proteins that move along intermediate filaments, in contrast to the variety of such proteins that associate with microtubules and actin filaments. What characteristic of intermediate filaments, in their polymerized form, might explain the absence of associated motor proteins? Briefly explain your reasoning.
- What would be the consequences of actin filament assembly/disassembly if a mutation prevented actins ability to bing ATPActin and microtubules have polarity, intermediate filaments have no polarity. What is the main consequence of this difference?Microfilaments are long filamentous proteins made up of many globular proteins. What main protein are microfilaments composed of?