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October Molecule of the Month

RCSB PDB Molecule of the Month
Ribonucleotide Reductase

Deposition Preparation Tools

Data Extraction

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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.

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Advanced Search

The Advanced Search interface enables queries by specific categories. Queries can be combined with AND or OR to construct complex searches.

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Search by Sequences

Choose Option A or B to search for protein and nucleic acid sequences.  Read Tutorial | Advanced Sequence Searching

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  • Drug-Target Complex: Atorvastatin bound to its target HMG-CoA reductase

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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 Tuesday Oct 15 2019 there are 156954 structures.

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Search PDB Statistics

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

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3D Structure Viewers

View PDB structures in 3D using NGL from any entry's Structure Summary page.

A 3D View (NGL) User Guide is available.

Pathway View

Explore metabolic pathways maps that identify pathway components with PDB structures and homology models.

Maps can be accessed from the Protein View (see example P29401), and the main Pathway View page.


PoseView images are 2D diagrams that show a ligand and interacting residues.

Black dashed lines indicate hydrogen bonds, salt bridges, and metal interactions. Green solid line show hydrophobic interactions and green dashed lines show π-π and π-cation interactions.

Access PoseView images in the Ligand Chemical Component section on an entry's Structure Summary.

Learn more about PoseView.

Protein Feature View

Provides a graphical summary of a full-length protein sequence from UniProt and how it corresponds to PDB entries. It also loads annotations from external databases (such as Pfam) and homology models information from the Protein Model Portal. Annotations visualizing predicted regions of protein disorder and hydrophobic regions are displayed.

Learn more about Protein Feature View.

Examples: Breast Cancer Type 1 ProteinGag-Pol Polyprotein, and Hemoglobin Alpha (shown image).

This feature is available from the Molecular Description widget on Structure Summary pages and by entering a UniProt ID below.

Human Gene View

Illustrates the correspondences between the human genome and 3D structure. All human genes have been mapped to representative PDB structure protein chains (selected from sequence clusters at 40% sequence identity) to show which regions of a gene are available in PDB coordinates.

Learn more about Gene View.

Examples: Breast Cancer 1 (early onset) and Hemoglobin, Alpha 1 (shown image).

This feature is available from the Molecular Description widget on Structure Summary pages and by entering an HGNC Human Gene Symbol below (examples).

Sequence & Structure Alignment

RCSB PDB's Comparison Tool calculates pairwise sequence (blast2seq, Needleman-Wunsch, and Smith-Waterman) and structure alignments (FATCAT, CE, TopMatch).

Comparisons can be made for any protein in the PDB archive and for customized or local files not in the PDB. Special features include support for both rigid-body and flexible alignments and detection of circular permutations.


Protein Symmetry

The JSmol symmetry display mode (select the 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


  • Streptavidin
    Symmetry Thumbnail for Streptavidin 1STP


  • Inovirus
    Symmetry Thumbnail for Inovirus 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 Position to Protein

Mutations in a gene can have profound effects on the function of a protein. This analysis tool highlights the location of a gene location (i.e., the site of a SNP).

Example of SNP in Breast Cancer 1 Gene

A TGT-to-GGT transversion in codon 64 of the BRCA1 gene leads to substitution of glycine for cysteine. This SNP is located on chromosome 17 at genomic coordinate: 43,106,478. The new mapping tool can be used to locate this position on the UniProt sequence and 3D structure.

Access the Mapping Tool
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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: Coordinates & Experimental Data

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FTP 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 at FTP archive, ftp.wwpdb.org (data download details) and Versioned FTP, ftp-versioned.wwpdb.org (Versioning details).

Major Directories

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  • 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 FTP Archive is available at ftp://ftp-versioned.wwpdb.org (See announcement). 

Read More on FTP Services


PDB structure files, chemical component files, and several other files are available for download via http/https. These URLs are useful in scripted downloads using utilities such as wget.

Downloadable Files

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Read More on our HTTP/HTTPS 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.


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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:

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    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

Improved resolution of DOIs for PDB entries

Improved resolution of DOIs for PDB entries

Access new wwPDB summary pages for released PDB entries with PDB DOIs
Mandatory PDBx/mmCIF format files submission for MX depositions

Mandatory PDBx/mmCIF format files submission for MX depositions

Submission of PDBx/mmCIF format files for crystallographic depositions to the PDB will be mandatory from July 1st 2019 onward. PDB format files will no longer be accepted for deposition of structures solved by MX techniques.
Join Our Team as a Biocurator

Join Our Team as a Biocurator

Curate, validate, and standardize macromolecular structures from the PDB community at Rutgers, The State University of New Jersey.
New Architecture and Services Enable Faster Access to More Information

New Architecture and Services Enable Faster Access to More Information

Explore the improved display of PDB Statistics, structure funding information, and 3D views of ligands and electron density.
Implementation of PDB Entry Versioning and Better Revision History to Improve PDB Archive Management

Implementation of PDB Entry Versioning and Better Revision History to Improve PDB Archive Management

A new FTP repository, ftp-versioned.wwpdb.org, now hosts versioned structural model files in PDBx/mmCIF and PDBML formats.
Improved Text Searching

Improved Text Searching

Simple text searches at rcsb.org are now easier and more accurate. Text searching from the top query bar has been redesigned and is now powered by the open source Apache Solr platform. Results are based on an indexing of PDBx/mmCIF data.

See new feature archive