Make room for dynein

Area of Science:

• Cell Biology
• Molecular Biology
• Biochemistry

Background:

• Cytoskeletal motor proteins, including myosins, kinesins, and dyneins, are crucial for various cellular movements essential for eukaryotic cell life.
• While the mechanisms of myosin and kinesin have been elucidated through crystallographic analysis, dynein's complexity has hindered similar progress.

Purpose of the Study:

• To investigate the structural organization and functional implications of the dynein motor domain.
• To propose a model for dynein's interaction with microtubules based on emerging structural evidence.

Main Methods:

• Analysis of crystallographic data for myosin and kinesin motor domains.
• Examination of evidence regarding dynein's microtubule-binding and ATPase domains.

Main Results:

• Crystallographic studies have revealed the force-production mechanisms of myosin and kinesin.
• Evidence suggests dynein's microtubule-binding domain is physically separated from its ATPase domain.
• This spatial arrangement is located at the tip of a projecting coiled coil.

Conclusions:

• The unique structure of dynein may facilitate the attachment of multiple motor heads to the microtubule surface.
• This arrangement could be key to accommodating dynein's large size and functional complexity.