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Solvent & Membrane Simulation Training | AMRA-Lab
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MD • 05

Solvent & Membrane
Simulation Training

Learn how to design, build, equilibrate, simulate and analyze lipid bilayers, membrane proteins, surfactant micelles, complex solvent systems, deep eutectic solvents, ionic liquids, dyes and chemical-solvent environments through reproducible, publication-oriented molecular dynamics workflows.

CHARMM-GUI Membrane BuilderPOPC • DPPC • DOPC • DMPCMembrane ProteinsMicelles & SurfactantsDES & Ionic LiquidsGROMACS-Ready Workflows
Explore Full Curriculum Open Official CHARMM-GUI
Atomistic environment Membrane + solvent
Two complete pathways

One course covering biomembranes and advanced solvent systems

The curriculum separates membrane simulation from solvent simulation where the physics and setup logic differ, then reconnects them through force-field selection, system validation, equilibration, analysis and scientific reporting.

Pathway A • Membranes

From a lipid recipe or membrane-protein structure to a stable production system

Build homogeneous, mixed and biologically inspired bilayers; orient membrane proteins; define leaflet composition; add water and ions; generate engine-specific inputs; and validate whether the membrane behaves physically.

01Select POPC, DPPC, DOPC, DMPC or a mixed composition according to the biological question, temperature and membrane state.
02Prepare membrane proteins, channels, transporters, receptors, peptides, cofactors, glycans and ligands without introducing clashes or incorrect topology.
03Evaluate area per lipid, bilayer thickness, order parameters, density, diffusion, water defects, lipid contacts and protein–lipid coupling.
Pathway B • Solvents

From a molecular composition to a validated liquid, mixture, micelle or solvation environment

Model aqueous and non-aqueous media, cosolvents, surfactant assemblies, ionic liquids, deep eutectic solvents and dye-containing systems while checking density, coordination, aggregation and transport behavior.

01Define composition using molecule counts, mole fractions, molality, concentration, water content, ion pairing and charge neutrality.
02Parameterize uncommon components and verify charge models, atom types, combination rules and compatibility with the selected force field.
03Analyze RDF, coordination number, H-bond networks, diffusion, viscosity-related trends, aggregation, solvation shells and residence times.
Highlighted platform tutorial

CHARMM-GUI as the central system-building control room

The training walks through CHARMM-GUI step by step rather than treating it as a download button. Learners understand what each builder changes, which files are generated, how components are packed, how equilibration restraints are staged and how to transfer the final system into GROMACS or another supported MD engine.

Visit CHARMM-GUI
MB

Membrane Builder

Bilayers, monolayers, membrane-protein complexes, nanodiscs, micelles, hexagonal phases and HMMM-style systems with lipid, water and ion assembly.

Official tutorial
SB

Solution Builder

Solvate proteins, nucleic acids and other molecular systems; select box geometry, water, ion type and concentration; and generate topology, coordinates and run scripts.

Official demo
MC

Micelle Builder

Build pure or mixed detergent micelles and protein–micelle complexes, then generate a controlled starting system for equilibration and production MD.

Module references
MA

Multicomponent Assembler

Pack multiple solvated, solvent, ion, membrane and sheet-like components into complex systems before generating simulation inputs.

Official overview
LR

Ligand Reader & Modeler

Prepare and parameterize small molecules that may represent dyes, cosolvents, additives, surfactant-like compounds or other custom system components.

Small-molecule library
OUT

Engine-Specific Inputs

Understand the generated equilibration and production packages for GROMACS, NAMD, AMBER, OpenMM, GENESIS, DESMOND, LAMMPS, Tinker and related workflows.

Video demos
Scientifically important: not every uncommon organic solvent, dye, ionic-liquid pair or DES composition is guaranteed to be available as a one-click predefined component. The course therefore teaches both the supported CHARMM-GUI route and the custom-parameter route, including force-field compatibility, topology checks and liquid-property validation.
Core phosphatidylcholine systems

Understand what changes when the bilayer contains POPC, DPPC, DOPC or DMPC

These four common model lipids differ in acyl-chain length and unsaturation. Those structural differences influence packing, fluidity, thickness, ordering and the temperature range appropriate for simulation.

POPC

POPC Bilayer

16:0 / 18:1 PC

A mixed saturated–unsaturated phosphatidylcholine commonly used as a fluid model membrane for proteins, peptides, permeability and ligand-partitioning studies.

  • Balanced fluidity and structural stability
  • Useful for membrane-protein insertion studies
  • Supports simple or mixed-leaflet systems
DPPC

DPPC Bilayer

16:0 / 16:0 PC

A fully saturated phosphatidylcholine widely used in bilayers, monolayers and liposome models where chain ordering and phase behavior are central.

  • High chain order relative to unsaturated PCs
  • Temperature-sensitive phase behavior
  • Relevant to pulmonary-surfactant models
DOPC

DOPC Bilayer

18:1 / 18:1 PC

A doubly unsaturated phosphatidylcholine that supports highly fluid membrane models and strong conformational freedom of lipid tails.

  • Suitable for fluid bilayer studies
  • Useful for liposomes and delivery systems
  • Supports partitioning and membrane-remodeling questions
DMPC

DMPC Bilayer

14:0 / 14:0 PC

A shorter-chain saturated phosphatidylcholine frequently used for controlled model bilayers, liposomes and membrane-property comparisons.

  • Shorter saturated acyl chains
  • Useful for thickness and phase comparisons
  • Common in model-membrane biophysics
Beyond a simple bilayer

Membrane systems from single lipids to realistic biological complexity

The course begins with a clean homogeneous system, then adds composition and structural complexity only when it supports the biological question.

MP

Membrane Proteins

Channels, receptors, transporters, enzymes, pores and membrane-bound complexes.

  • OPM/RCSB orientation choices
  • Missing loops, cofactors and ligands
  • Transmembrane placement and tilt
MIX

Mixed & Asymmetric Bilayers

Different lipid ratios in upper and lower leaflets with controlled charge and composition.

  • Cholesterol and anionic lipids
  • Leaflet imbalance checks
  • Protein area compensation
BIO

Biological Membrane Models

Plasma, bacterial, organelle, glycolipid-rich and other compositionally complex systems.

  • Glycolipids and lipoglycans
  • LPS-containing outer membranes
  • Realistic biomembrane recipes
ND

Nanodiscs, Vesicles & Micelles

Membrane mimetics for soluble membrane-protein studies and nanoscale lipid assemblies.

  • Nanodisc dimensions and scaffold context
  • Micelle aggregation and detergent selection
  • Coarse-grained options where appropriate
HMM

HMMM & Accelerated Membrane Models

Highly mobile membrane-mimetic systems for faster lipid rearrangement and insertion studies.

  • Know the model assumptions
  • Use controlled equilibration
  • Do not report it as a full bilayer without qualification
LNP

Lipid Nanoparticles & Droplets

Advanced lipid assemblies involving ionizable lipids, PEGylated components, droplets or delivery-oriented models.

  • Composition and protonation
  • Water and cargo placement
  • Model-specific stability checks
Solvent simulation universe

From water boxes to micelles, ionic liquids, DES and dye-containing media

Non-aqueous and multicomponent liquids require more than adding molecules to a box. The course emphasizes composition, parameterization, equilibration, liquid density, association structure and transport behavior.

SOLVENT
SIMULATIONComposition • Force Field • Validation
Aqueous & Mixed Solventswater, cosolvent, salts
Surfactants & Micellesaggregation and solubilization
Chemical Solventsorganic liquids and mixtures
Ionic Liquidscation–anion networks
Deep Eutectic SolventsHBA/HBD mixtures
Dyes & Additivessolvation, aggregation, partitioning
AQ

Aqueous and Cosolvent Systems

Water models, salts, pH-related protonation choices, binary mixtures, cosolvent concentration, preferential solvation and biomolecule stability.

MIC

Surfactant & Micelle Simulation

Pure and mixed micelles, surfactant aggregation, critical composition choices, micelle size, shape, radius of gyration, aggregation number and guest solubilization.

IL

Ionic Liquids

Cation–anion pairing, water content, nanostructuring, coordination shells, diffusion, charge-model sensitivity and density validation.

DES

Deep Eutectic Solvents

Hydrogen-bond acceptor/donor composition, mole ratio, water activity, network structure, density, diffusion and solute stabilization.

DYE

Dyes in Solvents or Membranes

Classical-MD preparation for solvation, aggregation, membrane partitioning and local environment analysis, while distinguishing these results from electronic excited-state calculations.

Complete learning roadmap

Sixteen stages from system idea to publication-ready interpretation

Each stage includes practical decisions, file checks, expected outputs, common failure modes and reporting guidance.

01

Scientific Question

Define the process, timescale, composition and observable before selecting a builder.

02

Structure Preparation

Clean protein, peptide, ligand, dye, surfactant or solvent-component structures.

03

Force-Field Strategy

Choose compatible protein, lipid, water, ion and small-molecule parameters.

04

CHARMM-GUI Navigation

Understand Input Generator, PDB Reader, job retrieval, archive and downloads.

05

Membrane Composition

Select POPC, DPPC, DOPC, DMPC, cholesterol or complex lipid ratios.

06

Protein Orientation

Place transmembrane proteins using biological and structural orientation evidence.

07

Leaflet & Box Design

Control lipid numbers, asymmetry, protein area, water thickness and ions.

08

Micelle Construction

Build detergent assemblies or protein–micelle complexes and inspect packing.

09

Solvent Composition

Convert concentrations and ratios into molecule counts with neutrality checks.

10

Custom Parameters

Prepare uncommon solvents, ionic-liquid ions, DES components and dyes.

11

System Assembly

Pack, solvate, remove overlaps, add ions and inspect the complete structure.

12

GROMACS Export

Read generated topology, coordinates, restraint files, MDP files and README.

13

Energy Minimization

Resolve severe contacts and verify maximum force, topology and energy behavior.

14

Staged Equilibration

Apply appropriate restraints, pressure coupling, temperature control and gradual release.

15

Production & Analysis

Run reproducible simulations and calculate system-specific observables.

16

Publication Reporting

Document composition, builders, versions, force fields, protocols, limitations and citations.

Analysis and evidence

Measure whether the system is physically stable and scientifically informative

General protein RMSD alone is insufficient for a membrane or solvent study. The observables must match the material being simulated.

Membrane

Area per Lipid

Leaflet-specific area, convergence, composition effects and comparison with model expectations.

Membrane

Thickness & Density

Phosphate-to-phosphate thickness, electron or mass density and interfacial structure.

Membrane

Lipid Order Parameters

Tail ordering, saturation effects, temperature dependence and local protein perturbation.

Membrane

Protein–Lipid Contacts

Annular lipids, residence time, lipid enrichment, headgroup interactions and hotspots.

Solvent

RDF & Coordination

Pair distribution, first solvation shell, coordination number and local organization.

Solvent

Hydrogen-Bond Network

Water, DES and polar-solvent connectivity, donor–acceptor preferences and lifetimes.

Dynamics

Diffusion & Residence Time

Translational mobility, ion or solvent residence and finite-size/convergence awareness.

Assemblies

Micelle Size & Aggregation

Aggregation number, radius, shape, surfactant organization and guest localization.

Membrane

Water Penetration & Defects

Hydration, pore formation, water wires and membrane-disruption mechanisms.

Free Energy

Partitioning & PMF

Solute insertion, permeation, membrane affinity or solvent-transfer profiles where justified.

Dyes

Aggregation & Orientation

π-stacking proxies, clustering, solvent exposure, membrane depth and orientation distributions.

Reporting

Publication Figures

Convergence plots, density profiles, order parameters, RDF, representative structures and uncertainty.

Quality control

Prevent attractive graphics from hiding an invalid simulation setup

The course trains participants to validate both the starting system and the final trajectory before interpreting molecular mechanisms.

Pre-simulation inspection

Every generated system is checked before minimization or production.

01
Composition and chargeLipid counts, leaflet ratios, solvent numbers, ion concentration and total charge.
02
Topology compatibilityAtom names, residue names, includes, parameters, exclusions and combination rules.
03
Geometry and packingProtein orientation, lipid penetration, severe overlap, trapped vacuum and solvent voids.
04
Periodic boundariesBox vectors, membrane normal, minimum image separation and centering.

Post-equilibration acceptance

A system proceeds to interpretation only after the relevant physical properties stabilize.

05
Volume and densityStable box behavior without persistent drift or unrealistic solvent density.
06
Membrane integrityNo unexplained pore, leaflet collapse, protein extrusion or lipid disorder caused by setup errors.
07
Sampling adequacyMultiple time windows or replicates support the reported structural and dynamical trends.
08
Method limitationsForce-field scope, viscosity errors, charge-model limitations and finite trajectory length are stated.
Important distinction: classical MD can characterize dye solvation, aggregation and membrane partitioning, but optical excitation, emission and electronic-state changes normally require quantum-chemical or QM/MM treatment.
Official learning resources

Continue with primary CHARMM-GUI tutorials and documentation

The page links to official resources so learners can verify current module behavior, supported components and required citations.

Official platform

CHARMM-GUI Home

Input Generator, API, ST-analyzer, Q&A, archive, lectures, video demonstrations and citation guidance.

Open platform →
Membrane tutorial

Membrane Builder Demo

Official walkthrough showing membrane types, membrane-protein preparation, lipid selection, packing, ions, water and engine-specific inputs.

Open tutorial →
Solution tutorial

Solution Builder Demo

Official example of manipulating and solvating biomolecular structures, selecting box shape, ions, concentration and force fields.

Open tutorial →
Complex systems

Multicomponent Assembler

Official overview of packing large components, solvent and ions, adding membranes and generating final inputs.

Open overview →
Reference library

CHARMM Small Molecule Library

Search available small molecules, inspect structures and obtain files or topology information for compatible system building.

Open library →
Publication practice

CHARMM-GUI Citations

Identify the main platform paper and module-specific references for Membrane Builder, Micelle Builder, HMMM, Martini Maker and more.

Open citations →
Training enrollment

Build a scientifically defensible membrane or solvent simulation workflow

AMRA-Lab provides one-to-one private mentorship and cohort-based intensive training covering setup, CHARMM-GUI, GROMACS execution, troubleshooting, post-simulation analysis, figure preparation and publication-oriented interpretation.

Email: contact@amra-lab.org WhatsApp: +1 (803) 755-5791
AMRA-Lab • Atomistic & Molecular Research Aid • Solvent & Membrane Simulation Training
Independent educational content. CHARMM-GUI and other named platforms remain the property of their respective developers.