Author: OneAngstrom

A molecular trajectory can produce a long list of useful measurements: distances, energy values, RMSD, radius of gyration, solvent-accessible surface area, and more. But reading each measurement separately can leave an important question unanswered: How do these observables relate to…

A protein–ligand structure can look ready for simulation and still fail during preparation. A common source of trouble is the gap between the ligand as it appears in the structure and the ligand described by its topology: atom names, hydrogens,…

Two protein structures can look different overall even when the part you care about is strikingly similar. The reverse can also happen: a whole-protein superposition may look reasonable while an important helix or binding-site region remains poorly aligned. This makes…

When a molecular trajectory plays, the region you wanted to study can drift out of view. A common reaction is to move the camera repeatedly, but that can make it harder to compare the motion or keep a presentation visually…

A common moment of uncertainty in molecular dynamics comes after temperature has settled: the system is in NPT equilibration, pressure is fluctuating, and it is not obvious whether the simulation is ready to move on. The useful question is not…

Assembling a molecule from fragments can feel deceptively simple: choose a piece, place it, and connect it. In practice, the difficult part is often knowing whether the connection is sensible, which atom should attach, and how to recover when a…

A molecular dynamics setup can be scientifically sound and still be frustrating to run: perhaps your lab uses a specific GROMACS installation, you need to reproduce a calculation with a particular version, or a local simulation makes your computer feel…

A crystal structure can look deceptively straightforward: open a file, see atoms, and move on. But when you are trying to model a material, a perfect, fully occupied lattice may not represent the structure you actually want to study. Defects…