The Protein Data Bank (PDB) is a repository for the 3-D structural data of large biological molecules, such as proteins and nucleic acids. The data, typically obtained by X-ray crystallography or NMR spectroscopy and submitted by biologists and biochemists from around the world, are freely accessible on the Internet via the websites of its member organisations. In the present database user can access the information about the crystal structures of betalactamases, their variants and amino acids within the active site. Furthermore, they can also access the information about the physiochemical properties of chemical compounds bound within the active site of the target. This information can be access by clicking the ligand option on summary table.