Subcompartmentalization and Pseudo-Division of Model Protocells

Area of Science:

• Origin of Life studies
• Cellular Biology
• Biophysics

Background:

• Membrane-bound compartments are a hallmark of eukaryotic cells, suggesting their presence in the last eukaryotic common ancestor.
• Emerging evidence indicates membranous compartments in bacteria and archaea, raising questions about earlier forms of compartmentalization.
• The hypothesis that the last universal common ancestor and protocells possessed compartmentalization remains experimentally untested.

Purpose of the Study:

• To investigate an autonomous mechanism for subcompartmentalization in protocells.
• To determine if protocell compartmentalization can occur without biological machinery or chemical energy.
• To explore the potential role of these mechanisms in the early evolution of cellular life.

Main Methods:

• Experimental modeling of protocell subcompartmentalization.
• Analysis of material properties and interfacial events driving compartment formation.
• Observation of the transformation of subcompartments into daughter protocells.

Main Results:

• An autonomous subcompartmentalization mechanism for protocells was demonstrated.
• The process was shown to be driven solely by fundamental material properties and interfacial events.
• No biological machinery or external chemical energy supply was required for subcompartmentalization.

Conclusions:

• Protocell subcompartmentalization is achievable through intrinsic physical and chemical processes.
• These findings support the hypothesis that early Earth conditions could have fostered compartmentalization in primitive cells.
• The proposed mechanism offers a potential pathway for the development of early cellular division and compartmentalized life.