Use a utility like WinRAR or 7-Zip to extract the .psf file from the archive.
Quartets of atoms defining rotation around bonds.
In a NAMD configuration file, point to the extracted file: structure input.psf .
The psf.rar archive contains a molecular topology file (PSF) essential for defining the structural connectivity of a biological system. It provides the "blueprint" for simulations, specifying how atoms are bonded, their types, and their charge distributions, which cannot be determined from a coordinate file (like PDB) alone. File Format: Roshal Archive (RAR). Internal File Type: Protein Structure File (PSF). Primary Compatibility:
A list of every atom in the system, including its unique ID, segment name, residue name, and atom type.
A standard PSF within this archive typically includes the following sections:
If the archive fails to open, ensure it was downloaded completely, as RAR files support error recovery records but may still be unreadable if severely truncated.