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In Bioinformatics (Oxford, England)

SUMMARY : p Ka values of ionizable residues and isoelectric points of proteins provide valuable local and global insights about their structure and function. These properties can be estimated with reasonably good accuracy using Poisson-Boltzmann and Monte Carlo calculations at a considerable computational cost (from some minutes to several hours). pKPDB is a database of over 12 M theoretical p K a values calculated over 120k protein structures deposited in the Protein Data Bank. By providing precomputed p K a and pI values, users can retrieve results instantaneously for their protein(s) of interest while also saving countless hours and resources that would be spent on repeated calculations. Furthermore, there is an ever-growing imbalance between experimental p K a and pI values and the number of resolved structures. This database will complement the experimental and computational data already available and can also provide crucial information regarding buried residues that are underrepresented in experimental measurements.

AVAILABILITY AND IMPLEMENTATION : Gzipped csv files containing p Ka and isoelectric point values can be downloaded from To query a single PDB code please use the PypKa free server at The pKPDB source code can be found at

SUPPLEMENTARY INFORMATION : Supplementary data are available at Bioinformatics online.

Reis Pedro B P S, Clevert Djork-Arné, Machuqueiro Miguel