Protein Data Bank (file format)

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**pdb**
File extension:	`.pdb, .ent, .brk`
Type of format:	chemical file format

Through the years the Protein Data Bank has undergone many, many changes and revisions. Its original format was dictated by the width of computer punch cards.

PDB Format Guide - Prepared by the PDB Staff at BNL The PDB format specification can be found here, and it is vital that you read this before looking at the raw data.
Recently PDB provides a representation of PDB data in XML format, PDBML format.
ftp.rcsb.org The raw data can be downloaded from here.

This legacy format has caused many problems with the format, and consequently the PDB has three distinct 'clean-up' projects;