Biological lipid nanotubes and their potential role in evolution

Area of Science:

• Cell Biology
• Biophysics
• Evolutionary Biology

Background:

• Cellular and organelle membranes are fluid interfaces capable of diverse shapes.
• Biological membranes exhibit a unique ability to form long, uniform nanotubes (nanoconduits).
• These nanoconduits are ubiquitous across all domains of life, including archaea, bacteria, plants, and mammals.

Purpose of the Study:

• To connect observations of nanotubes across different biological branches.
• To outline the similarities and differences in nanotube formation and function.
• To provide a perspective on the joint functions and evolutionary origin of biological nanotubes.

Main Methods:

• Review of existing literature on membrane nanotubes.
• Comparative analysis of nanotube structures and formation mechanisms.
• Exploration of potential evolutionary links from bacterial ancestors.

Main Results:

• Membrane nanotube formation involves mechanical forces (anchoring, pulling) or curvature-inducing molecules.
• Nanotube radius is determined by a balance of tension and bending forces.
• Similarities in formation and potential shared functions suggest an ancient evolutionary origin.

Conclusions:

• Biological nanotubes, despite varied nomenclature (e.g., plant stromules, mammalian tunneling nanotubes), share fundamental properties.
• Their formation mechanisms and widespread presence suggest an inherited trait from bacterial ancestors via endosymbiotic evolution.
• Understanding these nanoconduits offers insights into intercellular communication and biological evolution.