PDB

Protein Data Bank (PDB) format is a standard for files containing atomic coordinates. It is used for structures in the Protein Data Bank and is read and written by many programs.

First, to do the structure of the Protein Data Bank, we have to go to here.

Then, search the structure you want to find.

Then, click on the download link on the structure.

This is the Crystal structure of Bacillus subtilis Lon N-terminal domain.

This is the classification of the structures:

Higher order taxa	Domain: Bacteria, phylum: Firmicutes, class: Bacilli, order: Bacillales, family: Bacillaceae (Entrez Genome Project)
Genus	Bacillus subtilis