Related Experiment Video
Updated: Jun 27, 2026

Structure-Guided Design and Development of Novel Cyclophilin A Inhibitors and Ganoderiol-F Derivatives: An In-Silico Approach
Published on: June 23, 2026
Do rotamer libraries reproduce the side-chain conformations of peptidic ligands from the PDB?
1Department of Systems Biology, Center of Molecular Immunology, Havana 11600, Cuba. amaury@cim.sld.cu
Abstract:
Rotamer libraries are collections of side-chain conformations compiled for each type of amino acid. All the libraries developed so far were constructed based on different sets of proteins, none of which includes small peptidic molecules. Are the existing rotamer libraries suitable for modeling the side chains of peptidic ligands in complex with their receptors? To answer this question, we have tested 10 different, publicly available and commonly used rotamer libraries for their capability of reproducing the side-chain conformations (and therefore the receptor-ligand interactions) of hundreds of short peptidic ligands found in the Protein Data Bank, including large sets of class I and class II T-cell epitopes. Only the libraries developed by Xiang and Honig were able to correctly reproduce the experimental geometries for most of the analyzed residues, and the atomic interactions between the peptidic ligands and their receptors. Surprisingly, all the libraries showed a lower performance in reproducing the side chains conformations from structures solved at very high resolution (R<1.25A).
More Related Videos
Related Concept Videos
Ligand Binding Sites
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
Ligand Binding Sites
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
Conserved Binding Sites
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally analyses the...
Ligand Binding and Linkage

