Welcome

A Structural View of Biology

This resource is powered by the Protein Data Bank archive-information about the 3D shapes of proteins, nucleic acids, and complex assemblies that helps students and researchers understand all aspects of biomedicine and agriculture, from protein synthesis to health and disease.


November Molecule of the Month

RCSB PDB Molecule of the Month
Acetohydroxyacid Synthase

Deposition Preparation Tools

Data Extraction

  • pdb_extract: Extract and harvest data in PDBx/mmCIF format from structure determination programs
  • SF-Tool: Convert structure factor files among various formats

Small Molecules

  • Ligand Expo: Search the Chemical Component Dictionary for the IDs of released ligands

Data Format Conversion

  • PDBML2CIF: Convert PDBML-format data into PDBx/mmCIF-format
  • PointSuite: Generate symmetry records for macromolecular assemblies with point and helical symmetries
  • MAXIT: Translate data between file formats and more

Validation Services

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).

Deposit 3D macromolecular structure data to the PDB


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.

Basic Search

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
Search icon to see results matching multiple fields.

Advanced Search

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.

Go to Advanced Search

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.

Read Tutorial

Advanced Search - Sequence Search

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.

As of Tue Nov 23 2021 there are 184407 structures.

Explore the PDB Archive

Search PDB Statistics

The PDB Statistics page lists the current holdings in the PDB and various growth statistics and histograms.

View PDB Statistics Page

Search Ligands

Search ligands bound to macromolecules in the PDB by:

  • SMILES String, InChI
  • Chemical Formula
Ligand Search

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)

Go to Advanced Search

Mol* 3D Viewer

Launch Mol* from the Structure Summary page for any entry.

standalone version of Mol* is available. Users can upload their custom files into this tool.

A detailed Mol* User Guide is available.


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  Protein Feature View.

Examples: SARS-CoV-2 spike glycoproteinH-Ras, and BRCA1

This feature is available in Structure Summary pages and Instance Sequence pages.

Genome View

Illustrates 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.

Examples: Breast Cancer 1 (early onset)SARS-CoV-2 spike glycoprotein and H-Ras (shown image).

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.

Protein Symmetry

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.

  • Hemoglobin
    Symmetry Thumbnail for Hemoglobin 4HHB

    PDB ID:4HHB

  • Streptavidin
    Symmetry Thumbnail for Streptavidin 1STP

    PDB ID:1STP

  • Inovirus
    Symmetry Thumbnail for Inovirus 1IFD

    PDB ID:1IFD

Structure Quality

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.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
Analyze Biological Assemblies image

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:

  • PDB
  • PDBx/mmCIF
  • PDBML/XML
  • 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


Go to the Downloads Page

Download: Sequences

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


Go to the Sequences Downloads Page

Download: Ligands

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


Go to the Ligands Downloads Page

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).

Major Directories

  • 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

The Versioned Archive is available at https://ftp-versioned.wwpdb.org (See announcement). 

Read More on File Download Services

Web 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

Molecular explorations
through biology and medicine

PDB-101 is an online portal for teachers, students, and the general public to promote exploration in the world of proteins and nucleic acids.

Browse all PDB-101 resources by biological theme or start exploring:

  • Molecule of the Month

    Presents short accounts on selected molecules from the Protein Data Bank.

  • News and Events

    Upcoming meetings and events RCSB will hold

  • Educational Resources

    Access materials that promote exploration in the world of proteins and nucleic acids.

  • Guide to PDB Data

    Understanding PDB Data is a reference to help explore and interpret individual PDB entries.

  • Curricula

    Authentic, hands-on teaching materials, individual and group activities.

  • Geis Digital Archive

    View iconic illustrations by the gifted artist Irving Geis (1908-1997) in context with PDB structures and educational information.

Features & Highlights

New Chemical Sketch Tool

New Chemical Sketch Tool

Build chemical drawings to search for small molecules in the PDB

Obituary for John Westbrook

Obituary for John Westbrook

John D. Westbrook Jr. (1957-2021) passed away on October 18, 2021. He was incredibly beloved and respected by his colleagues at Rutgers and throughout the world, known for his dry wit and endless enthusiasm for thinking about all aspects of data and data management.

Take the RCSB.org User Survey and Win

Take the RCSB.org User Survey and Win

Please take this brief survey to be entered into a drawing for a set of PDB50 Structural Biology Playing Cards.

New PDB Citation MeSH Network Explorer

New PDB Citation MeSH Network Explorer

Find connections between articles describing PDB structures with this new browser

User Survey: Tell RCSB PDB About Your Interests

User Survey: Tell RCSB PDB About Your Interests

Please take this brief survey to be entered into a drawing for a set of PDB50 Structural Biology Playing Cards.

PDBx/mmCIF data files to include PI information

PDBx/mmCIF data files to include PI information

PI name, email, and ORCiD ID will be publicly available in PDBx/mmCIF data files starting September 24, 2021

Pairwise Structure Alignment

Pairwise Structure Alignment

Comparisons can be made for any protein in the PDB archive and/or uploaded data files.

Improved Access to Chemical Component Definitions and Archive Inventories

Improved Access to Chemical Component Definitions and Archive Inventories

Individual Chemical Component Dictionary entries and new archive inventory lists are now available

Explore Ligand Quality

Explore Ligand Quality

New graphics summarize quality assessments

Small Molecule Search Results Options

Small Molecule Search Results Options

For any search, retrieve small molecule information about associated chemical components and peptide-like antibiotic and inhibitor molecules


See new feature archive

Molecule of the Month

Acetohydroxyacid Synthase

Acetohydroxyacid Synthase

In plants, AHAS performs the first step in synthesis of three essential amino acids, making it an effective target for herbicides.

Read More

Quarterly News (see archive)

Issue 90 - July 2021

PDB50 celebrations; consistent PDB data format; sequence redundancy statistics; and more. Summer 2021 Issue

Annual Reports

2020 Annual Report

Download the 2020 Annual Report (PDF) for an overview of activities relating to Deposition/Biocuration, Archive Management/Access, Data Exploration, and Outreach/Education.

Annual Report Archive