Two protein structures can show different conformations, but the gap between them is often the hard part. A modeler may need intermediate structures to inspect a motion, define a reaction coordinate, or prepare a starting path for simulation. Simply placing…

A molecular trajectory can produce a lot of numbers: distances, energies, RMSD, radius of gyration, solvent-accessible surface area, and more. Looking at each measurement separately may show that it changes, but not whether two changes happen together. Does a particular…

A molecular scene can become difficult to follow when a component disappears all at once. A sudden change may leave viewers wondering whether the structure was removed, hidden, or simply replaced. A gradual fade offers a calmer way to shift…

A molecular simulation can be perfectly prepared and still stall over a deceptively small question: which atoms should this operation act on? A default GROMACS index group may be too broad for a pulling setup, a residue subset, or a…

A protein structure can look plausible in a 3D viewer and still contain local backbone conformations worth a closer look. This is a common modeling frustration: visual inspection may not make it obvious which residues are strained, or where to…

A center-of-mass (COM) pulling simulation can look correctly configured and still be undermined by a basic setup mistake: not leaving enough room in the periodic box for the motion. If the pulled group travels too far relative to the box,…