Factor Xa subsite mapping by proteome-derived peptide libraries improved using WebPICS, a resource for proteomic identification of cleavage sites

Biol Chem. 2011 Nov;392(11):1031-7. doi: 10.1515/BC.2011.158.


Proteomic identification of protease cleavage site specificity (PICS) is a recent proteomic approach for the easy mapping of protease subsite preferences that determines both the prime- and non-prime side specificity concurrently. Here we greatly facilitate user access by providing an automated and simple web-based data-analysis resource termed WebPics (http://clipserve.clip.ubc.ca/pics/). We demonstrate the utility of WebPics analysis of PICS data by determining the substrate specificity of factor Xa from P6-P6', an important blood coagulation protease that proteolytically generates thrombin from prothrombin. PICS confirms existing data on non-prime site specificity and refines our knowledge of factor Xa prime-site selectivity.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amino Acid Sequence
  • Factor Xa / chemistry
  • Factor Xa / metabolism*
  • Humans
  • Internet
  • Peptide Library*
  • Proteomics / methods*
  • Software
  • Substrate Specificity


  • Peptide Library
  • Factor Xa