Collisions of Cortical Microtubules with Membrane Associated Myosin VIII Tail

Area of Science:

• Plant Cell Biology
• Cytoskeletal Dynamics
• Plasma Membrane Proteins

Background:

• Cortical microtubules (MTs) and plasma membrane proteins often exhibit coordinated distribution.
• The prevailing hypothesis suggests MTs inhibit protein diffusion, organizing membrane proteins.
• The stability of myosin VIII ATM1 tail's membrane position prompted investigation into its role in MT organization.

Purpose of the Study:

• To investigate the reciprocal relationship between myosin VIII ATM1 tail and cortical microtubule organization.
• To determine if myosin VIII ATM1 tail influences microtubule organization due to its stable membrane localization.

Main Methods:

• Co-localization studies of myosin VIII ATM1 tail and remorin 6.6.
• Observation of microtubule (MT) dynamics upon overexpression of myosin VIII ATM1 tail.
• Analysis of collisions between MTs (labeled with EB1) and ATM1 tail clusters.

Main Results:

• Myosin VIII ATM1 tail co-localized with remorin 6.6, another stable membrane protein.
• Overexpression of myosin VIII ATM1 tail resulted in reduced MT orientation dispersion.
• Collisions between MTs and ATM1 tail clusters led to varied outcomes, including altered elongation rates and direction changes.
• MT tracks (EB1) exhibited increased straightness in the presence of ATM1 tail.

Conclusions:

• Myosin VIII ATM1 tail's stable membrane association can influence cortical MT organization.
• Collisions between MTs and ATM1 tail-labeled structures contribute to the coordinated organization of MTs.
• This study reveals a potential mechanism where membrane proteins actively shape cytoskeletal organization.