Effect of Kinesin-5 Tail Domain on Motor Dynamics for Antiparallel Microtubule Sliding

Area of Science:

• Molecular Biology
• Cell Biology
• Biophysics

Background:

• Kinesin-5 motors, like Eg5, are essential for chromosome segregation during mitosis.
• Eg5 motors possess head and tail domains; tails are known to influence motor dynamics and force generation.
• Previous studies suggest Eg5 tails are critical for multiple motors to slide antiparallel microtubules effectively.

Purpose of the Study:

• To elucidate the molecular mechanism by which Eg5 motor tails modulate their dynamics.
• To compare the dynamics of single Eg5 motors with and without tails.
• To analyze the impact of tails on the collective behavior of multiple Eg5 motors in sliding antiparallel microtubules.

Main Methods:

• Analytical modeling of single kinesin-5 Eg5 motor dynamics on a single microtubule.
• Numerical simulations of multiple kinesin-5 Eg5 motors sliding antiparallel microtubules.
• Comparison of motor dynamics with and without tail domains.

Main Results:

• Analytical results demonstrate how tails affect single Eg5 motor dynamics on microtubules.
• Numerical simulations show the influence of tails on the force generation and sliding of antiparallel microtubules by multiple Eg5 motors.
• Both single- and multi-motor dynamics with tails align with experimental observations.

Conclusions:

• The study provides a molecular understanding of how Eg5 motor tails regulate motor function.
• Tail domains are critical for both individual motor performance and collective force generation in kinesin-5 motors.
• The findings support the role of Eg5 tails in ensuring accurate chromosome segregation during mitosis.