Protein Data Bank

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The Protein Data Bank (PDB) is a repository for 3-D structural data of proteins and nucleic acids. These data, typically obtained by X-ray crystallography or NMR spectroscopy and submitted by biologists and biochemists from around the world, are released into the public domain, and can be accessed for free. See also protein structure.

Contents

[edit] History

Founded in 1971 by Drs. Edgar Meyer and Walter Hamilton Brookhaven National Laboratory, management of the Protein Data Bank was headed by Tom Koestle until 1994 and then by Joel Sussman till 1999, when it was transferred to members of the Research Collaboratory for Structural Bioinformatics (RCSB). Rutgers University is the lead site and is currently under the direction of Helen M. Berman.Helen M. Berman - Rutgers Chemistry and Chemical Biology Department

The Worldwide Protein Data Bank (wwPDB) consists of organizations that act as deposition, data processing and distribution centers for PDB data. The founding members are RCSB PDB (USA), MSD-EBI (Europe) and PDBj (Japan). The BMRB (USA) group joined the wwPDB in 2006. The mission of the wwPDB is to maintain a single Protein Data Bank Archive of macromolecular structural data that is freely and publicly available to the global community.

The PDB is a key resource in structural biology and is critical to more recent work in structural genomics.

Countless derived databases and projects have been developed to integrate and classify the PDB in terms of protein structure, protein function and protein evolution.

[edit] Growth

When the PDB was originally founded it contained just 7 protein structures. Since then it has undergone an approximate exponential growth in the number of structures, which does not show any sign of falling off.

The growth rate of the PDB has been the subject of fairly extensive analysis.

[edit] Contents

As of 24 June, 2008, the database contained 51,491 released atomic coordinate entries (or "structures"), 47,526 of that proteins, the rest being nucleic acids, nucleic acid-protein complexes, and a few other molecules. About 5,000 new structures are released each year. Data are stored in the mmCIF format specifically developed for the purpose. It is estimated that the size of the PDB archive will triple to 150,000 structures by the year 2014.Template:Cite web

Note that the database stores information about the exact location of all atoms in a large biomolecule (although, usually without the hydrogen atoms, as their positions are more of a statistical estimate); if one is only interested in sequence data, i.e., the list of amino acids making up a particular protein or the list of nucleotides making up a particular nucleic acid, the much larger databases from Swiss-Prot and the International Nucleotide Sequence Database Collaboration should be used.

[edit] Statistics

As of 24 June, 2008, the "PDB Holdings List" at RCSB reported the following statistics:

Proteins Nucleic Acids Protein/NA complexes Other Total
X-ray diffraction 40912 1046 1873 24 43855
NMR 6401 809 138 7 7355
Electron microscopy 124 11 47 0 182
Other 89 4 4 2 99
Total 47526 1870 2062 33 51491

Note that theoretical models are no longer accepted in the PDB.

33,017 structures in the PDB have a structure factor file. 4,054 structures in the PDB have an NMR restraint file.

The current breakdown of holdings is updated weekly.

[edit] File format

Through the years the PDB file format has undergone many, many changes and revisions. Its original format was dictated by the width of computer punch cards.

This legacy format has caused many problems with the format, and consequently there are 'clean-up' projects;

The MMDB uses ASN.1 (and an XML conversion of this format). The wwPDB members RCSB PDB, MSD-EBI, and PDBj are working together to make the data uniform across the archive. Some believe this to be desirable; others argue that, without a universal repository of information (i.e., a common dictionary), it is not possible to draw comparisons.Template:Fact

Each structure published in PDB receives a four-character alphanumeric identifier, its PDB ID. This should not be used as an identifier for biomolecules, since often several structures for the same molecule (in different environments or conformations) are contained in PDB with different PDB IDs.

If a biologist submits structure data for a protein or nucleic acid, wwPDB staff reviews and annotates the entry. The data are then automatically checked for plausibility. The source code for this validation software has been released for free. The main data base accepts only experimentally derived structures, and not theoretically predicted ones (see protein structure prediction).

Various funding agencies and scientific journals now require scientists to submit their structure data to PDB.

[edit] Viewing the data

The structural data can be used to visualize the biomolecules with appropriate software, such as VMD, RasMol, PyMOL, Jmol, MDL Chime, QuteMol, web browser VRML plugin or any web-based software designed to visualize and analyse the protein structures such as STING. A recent desktop software addition is Sirius. The RCSB PDB website also contains resources for education, structural genomics, and related software.

[edit] References

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[edit] Printed

  • Berman HM, Henrick K, Nakamura H (2003). "Announcing the worldwide Protein Data Bank". Nature Structural Biology 10(12):980. PMID 14634627.
  • Berman HM, Westbrook J, Feng Z, Gilliland G, Bhat TN, Weissig H, Shindyalov IN, Bourne PE (2000). "The Protein Data Bank". Nucleic Acids Research 28:235-242. PMID 10592235
  • Bernstein FC, Koetzle TF, Williams GJ, Meyer Jr EF, Brice MD, Rodgers JR, Kennard O, Shimanouchi T, Tasumi M (1977). "The Protein Data Bank: a computer-based archival file for macromolecular structures". J Mol Biol 112:535-542. PMID 875032.
  • Meyer EF (1997). "The first years of the Protein Data Bank". Protein Science 6:1591-1597.
  • Sussman JL, Lin D, Jiang J, Manning NO, Prilusky J, Ritter O, Abola EE (1998). "Protein data bank (PDB): a database of 3D structural information of biological macromolecules". Acta Cryst D54:1078-1084. PMID 10089483.

[edit] See also

Crystallographic database

[edit] External links

[edit] Related (derived) resources

Main article: Protein structure databases

[edit] Enzyme database data

[edit] Molecular graphic visualisation tools

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