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- W2076154818 abstract "Abstract Background Charge states of ionizable residues in proteins determine their pH-dependent properties through their pK a values. Thus, various theoretical methods to determine ionization constants of residues in biological systems have been developed. One of the more widely used approaches for predicting pK a values in proteins is the PROPKA program, which provides convenient structural rationalization of the predicted pK a values without any additional calculations. Results The PROPKA Graphical User Interface (GUI) is a new tool for studying the pH-dependent properties of proteins such as charge and stabilization energy. It facilitates a quantitative analysis of pK a values of ionizable residues together with their structural determinants by providing a direct link between the pK a data, predicted by the PROPKA calculations, and the structure via the Visual Molecular Dynamics (VMD) program. The GUI also calculates contributions to the pH-dependent unfolding free energy at a given pH for each ionizable group in the protein. Moreover, the PROPKA-computed pK a values or energy contributions of the ionizable residues in question can be displayed interactively. The PROPKA GUI can also be used for comparing pH-dependent properties of more than one structure at the same time. Conclusions The GUI considerably extends the analysis and validation possibilities of the PROPKA approach. The PROPKA GUI can conveniently be used to investigate ionizable groups, and their interactions, of residues with significantly perturbed pK a values or residues that contribute to the stabilization energy the most. Charge-dependent properties can be studied either for a single protein or simultaneously with other homologous structures, which makes it a helpful tool, for instance, in protein design studies or structure-based function predictions. The GUI is implemented as a Tcl/Tk plug-in for VMD, and can be obtained online at http://propka.ki.ku.dk/~luca/wiki/index.php/GUI_Web ." @default.
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- W2076154818 date "2011-01-26" @default.
- W2076154818 modified "2023-10-09" @default.
- W2076154818 title "Graphical analysis of pH-dependent properties of proteins predicted using PROPKA" @default.
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- W2076154818 doi "https://doi.org/10.1186/1472-6807-11-6" @default.
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