PSI Structural Biology Knowledgebase

PSI | Structural Biology Knowledgebase
Header Icons

Since 2000, the Protein Structure Initiative (PSI) supported the development of new technologies and methods that improve the throughput of protein structure determination. This effort resulted in the deposition of nearly 7000 protein structures to the Protein Data Bank, and the creation of over 20 million homology models over a 15-year period.

The Structural Biology Knowledgebase and its services continued to deliver PSI results for two years, and is concluding its services on July 5, 2017. The disposition of each SBKB component module is given here:

  • BioSync — a curated catalog of X-ray light facilities for biological research — will remain operational, but will move within the RCSB family of resources. Effective July 5, 2017, the new web address for BioSync will be
  • TargetTrack — all of the files available on TargetTrack's "Data for Download" site (final release: July 1, 2017) are archived on Zenodo, the open research data repository. These data have been assigned DOI: 10.5281/zenodo.821654.
  • PSI Technology Portal — these technical reports have been retired.
  • PSI Publications Portal — the final bibliography of 2300+ PSI publications have been archived in CSV and Endnote formats on Zenodo. These data have been assigned DOI: 10.5281/zenodo.821648.
  • The Nature Research Highlight and Molecule of the Month E-Collection — the Structural Biology Highlights written by David Goodsell are available on PDB-101. Other articles have been retired
  • SBKB Main website — public access to the SBKB database and the Sequence Comparison and Analysis Tool (SCA-TOOL) will end as of July 5, 2017, and users will be redirected to this landing page.
  • Web services — will no longer be available as of July 5, 2017.

Thank you for a decade of knowledge-based discovery.

— With warmest regards, the PSI SBKB team

Final PSI Summary (June 2017)

Total structures to date:6920
Total distinct structures:5472
Total community structures:599
View Full PSI Metrics report

Total Final Holdings (Release 6/27/2017)

Total Structures:131,416
Total Annotations:23.73 M
Total Homology Models:22.8 M
Total Targets:335,714