The Protein Geometry Database.
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README.md

Protein Geometry Database

The PGD allows you to explore either protein conformation or protein covalent geometry or the correlations between protein conformation and bond angles and lengths.

You can search an up-to-date database of nonredundant protein chains while selecting chains based on the R value and resolution and filtering residues based on their average B factor. You can select structural motifs up to 10 residues long with either broad secondary-structure types or fine-grained ranges of the Φ and ψ dihedral angles. You can additionally restrict your query by amino acid type, by backbone covalent geometry and/or side chain conformational angles.

Search results appear on an interactive plot which defaults to a Ramachandran plot. Any conformational angle, bond length, or bond angle of any of the residues in the motif can be plotted. The colors can indicate the observational density or the value of any of the other stereochemical properties of any other residue.

Plot of phi versus psi of the average N CA C angle