AI Laboratory Membrane Assembly

Membrane Assembly

Without a boundary, chemistry dissipates into the ocean. Explore how fatty acids and other simple amphiphiles spontaneously form vesicles — tiny spheres that became the first protocell compartments, separating "self" from "environment."

Understanding Membrane Formation

Amphiphiles are molecules with a water-loving (hydrophilic) head and a water-fearing (hydrophobic) tail. When concentrated above a critical threshold (the critical micelle concentration, or CMC), they spontaneously organise: first into micelles (small spheres), then into bilayer vesicles — hollow double-layered spheres that can trap molecules inside.

Amphiphiles Hydrophilic head Hydrophobic tail → above CMC Micelle → growth Vesicle (Protocell) Bilayer traps molecules inside → compartment

Why Membranes Matter for Life

Compartmentalisation

A membrane creates an inside and an outside. This concentrates reactants, protects fragile molecules (like RNA) from dilution, and allows chemical gradients to build up. Without compartments, the chemistry of life would dissipate into the ocean.

Prebiotic Fatty Acids

Short-chain fatty acids (8–12 carbons) form in meteorites, hydrothermal vents, and Fischer-Tropsch synthesis. These simple molecules readily form vesicles under alkaline conditions and can grow by incorporating more fatty acids.

Growth & Division

When vesicles absorb fatty acids, they grow. As they grow, surface area increases faster than volume, creating mechanical stress. Eventually they divide — a purely physical process that mimics cell division without any biological machinery.

Selective Permeability

Early membranes were leaky — allowing small nutrients to pass through while retaining large polymers inside. This selective permeability is essential: a cell must eat but not lose its internal chemistry.

AI Analysis Tools

Critical Micelle Concentration

Predict CMC values for mixtures of prebiotic amphiphiles (fatty acids, isoprenoids, polycyclic aromatics) using molecular descriptor QSPR models.

QSPRCMC Prediction

Vesicle Stability Analysis

Evaluate bilayer stability under varying pH, ionic strength, temperature, and wet-dry cycles. Predict membrane permeability to small molecules.

MD SurrogatePermeability

Division Dynamics

Model vesicle growth-and-division cycles. Use physics-informed neural networks to predict when osmotic pressure or surface tension triggers fission.

PINNDivision Trigger
Ready — explore membrane formation and protocell compartmentalisation.