PDB2PQR: an automated pipeline for the setup of PoissonBoltzmann electrostatics calculations
Department of Biochemistry and Molecular Biophysics, Center for Computational Biology, Washington University in St Louis, 700 S. Euclid Avenue, Campus Box 8036, St Louis, MO 63110, USA, 1 Department of Chemistry and Biochemistry and 2 Department of Pharmacology, Center for Theoretical Biological Physics, Howard Hughes Medical Institute, University of California at San Diego, 9500 Gilman Drive, Mail Code 0365, La Jolla, CA 92093-0365, USA and 3 Department of Biochemistry, Conway Institute of Biomolecular and Biomedical Research, University College Dublin, Belfield, Dublin 4, Ireland
* To whom correspondence should be addressed. Tel: +1 314 362 2040; Fax: +1 314 362 0234; Email: baker{at}biochem.wustl.edu
Received February 10, 2004; Revised and Accepted March 15, 2004
Continuum solvation models, such as PoissonBoltzmann and Generalized Born methods, have become increasingly popular tools for investigating the influence of electrostatics on biomolecular structure, energetics and dynamics. However, the use of such methods requires accurate and complete structural data as well as force field parameters such as atomic charges and radii. Unfortunately, the limiting step in continuum electrostatics calculations is often the addition of missing atomic coordinates to molecular structures from the Protein Data Bank and the assignment of parameters to biomolecular structures. To address this problem, we have developed the PDB2PQR web service (http://agave.wustl.edu/pdb2pqr/). This server automates many of the common tasks of preparing structures for continuum electrostatics calculations, including adding a limited number of missing heavy atoms to biomolecular structures, estimating titration states and protonating biomolecules in a manner consistent with favorable hydrogen bonding, assigning charge and radius parameters from a variety of force fields, and finally generating PQR output compatible with several popular computational biology packages. This service is intended to facilitate the setup and execution of electrostatics calculations for both experts and non-experts and thereby broaden the accessibility to the biological community of continuum electrostatics analyses of biomolecular systems.
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