Provides a compendium of protein residue-specific ionization equilibria. The PPD serves as a general protein pKa archive and as a source of data that allows for the development and improvement of pKa prediction systems. Database entries also give details of experimental techniques and links to other key databases, such as National Center for Biotechnology Information and the Protein Data Bank. The PPD data was sourced from the primary literature and contains in excess of 1400 entries.
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