The Best CATH Alternatives in 2026

RCSB PDB supports searching, visualizing, downloading, and analyzing protein structures and related sequence, structure, and function data.

The SWISS-MODEL Repository contains annotated 3D protein structure models generated by a homology-modelling pipeline.

The Human Protein Atlas organizes protein information across tissues, brain, cells, blood, disease, structure, and interaction resources.

The Worldwide Protein Data Bank manages the public archive of 3D structures for proteins, nucleic acids, and complex assemblies.

PeptideAtlas provides a proteomics data repository with database search, dataset builds, and data contribution options.

The Cambridge Structural Database contains curated crystal-structure data for chemistry research.

The Database of Zeolite Structures provides searchable structural information, descriptions, drawings, and animated displays for approved zeolite framework types.

The Integrated Interactions Database lets users search interaction data by gene or protein identifiers and organism.

The PlaBi database covers crop plants and Arabidopsis, including sequence data for protein-coding genes.

The Candida Genome Database provides curated genomic, protein, phenotype, literature and sequence information.

The Italian Senate Data Portal offers direct access to Senate data, with options to download or query datasets and subscribe to updates.

PDBj maintains the single global PDB/BMRB/EMDB archives of macromolecular structures and provides integrated tools for searching and analyzing PDB data.

The Nucleic Acid Knowledgebase provides 3D structural information about nucleic acids, with structures, search, and full-text access.

Reciprocal Net links a distributed crystallography network with a searchable collection of common molecular structures.

PAZy catalogs plastic-active enzymes, substrates, enzyme structures, and curated literature on plastic degradation.

WURM catalogs computed mineral properties, including crystal structures, calculation parameters, and spectral measurements.

EMDataResource archives and retrieves three-dimensional electron microscopy structures, with data standards, validation methods, and related tools.

Search BioGRID's online repository of protein, chemical, and genetic interaction data.

UniPROBE supports searching protein-binding microarray data by protein, domain, species, or publication.

UniProtKB/Swiss-Prot is the reviewed section of UniProtKB, with manually annotated protein sequences and experimental information.

EMAGE provides searchable gene and protein records with filters for specimens, annotations, data sources, assays, and anatomy terms.

VirHostNet integrates and curates virus-host protein interaction data for reproducible systems-level analysis and visualization.

APID catalogs agile protein interactions and includes a coronavirus interaction dataset.

TheCellVision presents studies and datasets on cell compartment morphology, protein localization, and image-based annotation.