A Structural View of Biology
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The RCSB PDB builds upon the data by creating tools and resources for research and education in molecular biology, structural biology, computational biology, and beyond.
Deposition Preparation Tools
- pdb_extract: Extract and harvest data in PDBx/mmCIF format from structure determination programs
- SF-Tool: Convert structure factor files among various formats
- Ligand Expo: Search the Chemical Component Dictionary for the IDs of released ligands
Data Format Conversion
Validation reports contain an assessment of the quality of a structure and highlight specific concerns by considering the coordinates of the model, the experimental data and the fit between the two. Easily interpretable summary information that compares the quality of a model with that of other models in the archive will help users of PDB data to critically assess archived entries and to select the most appropriate structural models for their needs. These reports are developed using the recommendations of thewwPDB Validation Task Forces.
Reports for released entries are available from Structure Summary pages.
Validation reports for manuscript reviewers are created during annotation of deposited structures.
Information and example Validation Reports (at wwpdb.org).
Check your X-ray, NMR, or EM structures before depositing (standalone server).
Have non-atomic coordinates, multi-scale structures obtained through integrative/hybrid (I/H) methods? Deposit at PDB-Dev which is a prototype deposition and archiving system for structural models obtained through integrative/hybrid (I/H) methods.
Questions about your deposition?
From any page on the site, a Basic Search can be run by entering a search term in the top Search Bar.
As you enter a term, you will see suggestions appearing in the dropdown menu that appears below the search bar. The suggestions are grouped by attribute name, indicating in the specific field or fields in which the search term was found.You can click on an item in the dropdown menu to see results matching only that particular attribute, or click the
The Advanced Search Query Builder tool allows you to construct complex boolean queries by specifying values for a wide range of structure attributes.
Text-based queries can be combined with sequence and structure similarity searches.
Search results can be returned at the structure, entity, or assembly level, and viewed in a variety of formats, for example, as a summary view, an images only gallery view, or in a Tabular Report format.
Any query and its results can be further refined by selecting additional criteria from the 'Refinements' panel.
Search by Sequences
Search protein and nucleic acid sequences using the mmseqs2 method to find similar protein or nucleic acid chains in the PDB.
The new Advanced Search Query Builder tool can be used to run sequence searches, and to combine the results with the other search criteria that are available.
Search by Unreleased & Access New Entries
The PDB archive is updated weekly in two phases
Phase I: Every Saturday by 3:00 UTC, for every new entry, wwPDB website provides sequence(s) (amino acid or nucleotide) for each distinct polymer and, where appropriate, the InChI string(s) for each distinct ligand and the crystallization pH value(s).
Phase II: Every Wednesday by 00:00 UTC, all new and modified data entries will be updated at each of the wwPDB FTP sites.
Next data entry update in:
Browse by Annotation
PDB entries have been annotated by various ontologies and hierarchical classification schemes.
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- Molecular Function
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- Source Organism
Explore the PDB Archive
Search ligands bound to macromolecules in the PDB by:
- SMILES String, InChI
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Search by Drugs & Drug Targets
Drugs & Drug Targets in the PDB have been mapped to DrugBank. They have been made available through the integrated search system. You can find some search examples under the help examples page.
Drug-Target Complex: Atorvastatin bound to its target HMG-CoA reductase
Drug: Atorvastatin (Lipitor)
3D Structure Viewers
View PDB structures in 3D using Mol* from any entry's Structure Summary page.A 3D View (Mol*) User Guide is available.
RCSB Protein Feature View
Provides a graphical summary of biological and structural protein features of PDB entities and how they correspond to UniProtKB  sequences. It loads features from RCSB PDB webservices and third party resources such as UniProtKB, CATH or SCOPe.
Learn more about RCSB Protein Feature View.
This feature is available in Structure Summary pages and Instance Sequence pages.
Genome ViewIllustrates the correspondences between PDB Entity sequences and genomes. When the relationships between PDB Entities and genes are available, PDB Entity sequences are mapped to their genome positions to show which regions of a gene are available in the Entity coordinates.
Learn more about Genome View.
This feature is available from the Structure Summary page Genome tab.
Pairwise Structure Alignment
The protein structure alignment tool allows for calculating pairwise structure alignments using different alignment methods. See the detailed documentation at this help page. Comparisons can be made for any protein in the PDB archive and for customized or local files not in the PDB.
Also, the standalone Mol* viewer application allows for calculating pairwise structure alignments based on sequence alignment. See detailed instructions on how to superpose structures at the Mol* help page.
The Mol* symmetry display mode (select the Assembly Symmetry button) highlights global, local, and helical symmetry among subunits. The view displays the symmetry axes, a polyhedron that reflects the symmetry, and a color scheme that emphasizes the symmetry.
Structure Summary pages provide access to information about structure quality.
The slider graphic compares important global quality indicators for a given structure with the PDB archive. Global percentile ranks (black vertical boxes) are calculated with respect to all X-ray structures available prior to 2011. Resolution-specific percentile ranks (white vertical boxes) are calculated considering entries with similar resolution.
This graphic is from the wwPDB Validation Report , which provides a more detailed assessment of the quality of a structure and highlights specific concerns. These reports were created using the recommendations of wwPDB Validation Task Forces.The full wwPDB Validation Report PDF is available for download. PDFs of Ramachandran plots (created by MolProbity) are provided to offer an independent method to evaluate the conformational quality of protein structures.
Map Genomic Locations to/from PDB
The 1D-coordinates API provides means to map between genomic coordinates and PDB positions. Find more information about this and other APIs in the webservices page.1D-coordinates API tutorial
EPPIC Biological Assemblies
EPPIC (Evolutionary Protein-Protein Interface Classifier) provides value-added information about biological assemblies in the PDB. This web server classifies interfaces present in protein crystals to distinguish biological interfaces from crystal contacts. EPPIC Version 3 enumerates all possible symmetric assemblies with a prediction of the most likely assembly based on probabilistic scores from pairwise evolutionary scoring.
Download Coordinate & Experimental Data Files
By entering PDB IDs, multiple files can be downloaded in batches containg one or more file formats.
Coordinate Data Files can be downloaded in the following formats:
- PDBML/XML (Header only)
- Biological Assemblies in PDB
- Biological Assemblies in PDBx/mmCIF
Experimental Data Files can be downloaded in the following formats:
- Structure Factors
- NMR Restraints
- Chemical Shifts
- NMR Restraints v2
By entering PDB IDs, sequences can be downloaded in FASTA format.
Sequences can be provided for any of these identifiers:
- Entry IDs
- Entity IDs
- Asym IDs
By entering chemical component IDs, SDF files with ligand coordinates can be downloaded.
Downloads are provided for:
- Coordinates of first chemical component instance from each PDB entry
- Coordinates of all chemical component instances from each PDB entry
- Ideal coordinates from Chemical Component Dictionary
File Download Services
Searches and reports performed on this RCSB PDB website utilize data from the PDB archive. The PDB archive is maintained by the wwPDB at the main archive, ftp.wwpdb.org (data download details) and the versioned archive, ftp-versioned.wwpdb.org (Versioning details).
- The directory pub/pdb is the entry directory for the PDB archive.
- The directory pub/pdb/data/structures/divided contains the current PDB contents including PDB, mmCIF, and PDBML/XML formatted coordinate files, structure factors and NMR restraints
Annual snapshots of PDB Archive are available. Read More on File Download Services
Programmatic access to individual structures and/or specific data items is provided through Web Service Application Program Interfaces (APIs).
New Web Service APIs are being developed; users should register with the RCSB PDB API electronic list for announcements.
Contact RCSB PDB with questions suggestions for specific services.More
Apo KIF14[391-735] in complex with a microtubule
Kif14[391-743] - ADP-AlFx open state class in complex with a microtubule
Structure of Dicer from Pichia stipitis
Crystal Structure of the anti-human P-Cadherin Fab CQY684
Structure of SARS-CoV-2 nsp16/nsp10 complex in presence of S-adenosyl-L-homocysteine (SAH)
Structural and kinetic characterization of Porphyromonas gingivalis glutaminyl cyclase
55S mammalian mitochondrial ribosome with mtRF1a and P-site tRNAMet
Structure of Machupo virus L polymerase in complex with Z protein (dimeric form)
Histone-lysine N-methyltransferase NSD2-PWWP1 with compound MRT10241866a
Salmonella flagellar basal body refined in C1 map
Features & Highlights
EXTENDED: Enter the 2021 CellPAINT Contest by May 6
Create images inspired by vaccines and by 50 years of the PDB with CellPAINT and win prizes
Future Planning: Entries with extended PDB and CCD ID codes will be distributed in PDBx/mmCIF format only
PDB users and related software developers should review code and begin to prepare for this change.
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Developers: HTTPS enforcement starts May 10
HTTPS will be required for RCSB PDB APIs and websites
Enter the 2021 CellPAINT Contest by May 1
Create images inspired by vaccines and by 50 years of the PDB with CellPAINT and win prizes
Modifications to support for SHEET and ligand SITE records in June 2021
PDBx/mmCIF will continue to provide these complex PDB data
Calculate Pairwise Structure Alignments
Detect functionally-related positions, analyze conformational changes, evolutionary relationships and more with this new tool
Search for Structural Motifs
Explore residue patterns that recur throughout the PDB
IQB and ERN: Electron Microscopy Community Voice of the Customer
Register for the online February 11 workshop that will solicit feedback from microscopists and facility managers about IT challenges
wwPDB EM Validation Reports Now Publicly Available
Reports for every released set of EM model coordinates in the PDB and every released EMDB map entry are available
See new feature archive
Watch videos on the Molecular Mechanisms of Drugs for Mental Disorders created by high school students and vote for your favorite before May 12. » 05/07/2021
Explore PDB's historical highlights alongside milestone advances in structural biology » 04/27/2021
Download the 2020 Annual Report for an overview of recent RCSB PDB activities, PDB structures and the pandemic, and celebrating 50 years of the PDB archive. » 04/24/2021
Fold DNA origami models, explore nucleic acids at PDB-101, and extract DNA at home. » 04/23/2021
Join the wwPDB May 4-5 for a symposium of speakers from around the world who have made tremendous advances in structural biology and bioinformatics » 04/18/2021
PDB50 anniversary celebrations; CellPAINT image contest; new search tools; and more. Education Corner Explores the Structure-Function Relationship with Digital and Physical 3D Models of Proteins. » 04/13/2021
Send messages to the PDB user community using email@example.com. » 04/09/2021
Visit PDB-101 to access the image of Respiratory Droplet highlighted in the current issue of American Scientist » 04/06/2021
Extensions to the PDBx/mmCIF dictionary for reflection data with anisotropic diffraction limits, for unmerged reflection data, and for quality metrics of anomalous diffraction data are now supported in OneDep. » 03/31/2021
Depositors can review curated PDB assemblies during the deposition process » 03/29/2021
Molecule of the Month
Quarterly News (see archive)
PDB50 anniversary celebrations; CellPAINT image contest; new search tools; and more. Spring 2021 Issue