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A web-based tool for real-time protein surface comparison and analysis. The server integrates a repertoire of methods to assist in high throughput screening and visualization of protein surface comparisons. 3D-Zernike Descriptors (3DZD) are utilized for the efficient comparison between a protein surface of a single chain, a single domain, or a single complex against all protein structures in the latest Protein Data Bank (PDB). Conveniently, the web interface also renders animated protein rotations, displays CATH protein structure classification codes, and structure alignment calculations using the Combinatorial Extension (CE) algorithm, and identifies geometric (i.e., pocket) regions on a given structure.

Statistics of latest release (Last updated on Nov 27, 2015):

All Entries 478,027
  Chain Entries 280,166
  Complex Entries 65,974
  Domain Entries 131,887
All (CACN) Entries 478,035
  Chain (CACN) Entries 280,142
  Complex (CACN) Entries 65,890
  Domain (CACN) Entries 132,003


Latest features:

  • Surface representation:Two options of surface representation are provided. The first one is the all-atom-surface representation, and the second is the backbone-atom-surface representation, which includes alpha C (CA), C, and N atoms in the main chain.

  • Database:3DZD of protein chains, domains, complexes and a combination of three above are repertoried in the website.

  • Batch mode: A batch mode is available to run multiple proteins for uses who would like to benchmark their methods against our approach.

  • Maintenance: The databases are weekly updated in pace with the latest PDB.

Copyright © 2015 KIHARA Bioinformatics LABORATORY, PURDUE University