RCSB PDB Search API
Full-featured search API for locating PDB identifiers that match complex query conditions. Supports text attribute searches, BLAST-like sequence similarity (protein, DNA, RNA), chemical small-molecule queries (formula, SMILES, InChI), 3D structure embedding searches, sequence motif searches, structural motif searches, and unstructured full-text searches. Results support pagination (up to 10,000 hits), sorting, faceted aggregations, and grouping by sequence identity or UniProt accession. Returns entries, assemblies, polymer entities, non-polymer entities, polymer instances, or chemical component identifiers.