1. Actin filaments are important for cell motility, including movement of Lister

Question

1. Actin filaments are important for cell motility, including movement of Listeria monocytogenes bacteria in infected cells, movement of whole cells (including fibroblasts and fish keratocytes), and contraction of striated muscle.
a. Which of these activities require myosin (the motor protein that moves along actin
filaments)?
b. Some of these movements require actin but not myosin How can a cell move without a motor protein?

2.Dynein and kinesin are motor proteins that walk along microtubules but they don’t move on actin filaments. Do you think this is a result of the primary, secondary, and/or tertiary structure of the tubulins and/or the motor proteins? Explain your answer

please help!

Explanation / Answer

So whenever you see myosin, always think movement that requires energy (ATP). So this is characteristic of muscle cells. The other two options simply only require actin. They do not require the motor protein because they simply "walk" along the actin molecule, much like kinetochore microtubules in mitosis/meiosis. 2) so primary is the amino acid sequence, secondary is the folding of the amino acid sequence, and tertiary is the overall 3D shape. So based on that, the ability to actually "walk" down a microtubule is based on the tertiary structure.

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