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Returns assembly IDs, composition (which entities and how many copies), preferred assembly flag, and form description. Critical for understanding whether a protein functions as a monomer, dimer, tetramer, or higher-order complex. Get biological assembly information (quaternary structure)

Critical for drug discovery, molecular docking, and understanding protein-ligand interactions. Get ligand binding site residues and interactions

Cofactors like heme, NAD+, FAD, and metal ions are essential for enzyme catalysis and protein function. Get cofactor and prosthetic group annotations

Get experimental method details for a structure

Returns chemical component IDs, names, molecular formulas, molecular weights, and their chain/residue positions. Essential for drug discovery and understanding protein-small molecule interactions. Get small molecule ligands bound in the structure

Shows the parent compound ID and modification name. Get non-standard amino acids and nucleotides

Returns entity IDs, molecule types, names, chain assignments, sequence lengths, molecular weights, source organisms, and gene names. Get molecular entities (chains, polymers) in a structure

Shows the original residue, mutated residue, chain, and position. Essential for understanding how the crystallized construct differs from the native protein. Get engineered mutations vs. wild-type sequence

Useful for finding the primary citation and methodology papers for a structure. Get associated journal publications and PubMed IDs

The first thing a structural biologist checks when evaluating a structure for reliability. Get global quality metrics for a structure

Useful for discovering alternative conformations, mutants, or complexes of the same protein that have been structurally characterized. Get related PDB entries citing the same publications

Shows residue names, numbers (both PDB and author numbering), organized by entity and chain. Returns a sample of the first 20 residues per chain for efficiency. Get full residue-level inventory per chain

Shows the count of helices and strands per chain, organized by molecular entity. Essential for understanding protein fold topology. Get helix, sheet, and coil assignments per residue

Use a 4-character PDB ID such as 1cbs, 4hhb, 6lu7. Get PDB entry summary with title, authors, and resolution

Returns UniProt accessions, chain assignments, and start/end position mappings. Essential for cross-referencing between protein sequence databases and 3D structural data. Get UniProt to PDB residue mappings

Use natural language queries like "insulin receptor kinase", "SARS-CoV-2 spike protein", "cryo-EM resolution<3", or specific organism names. Returns PDB IDs, titles, methods, resolutions, and organisms. Search PDB structures with full-text queries