Find the official entry name of your protein of interest: http://uniprot.org
Crawford E.D.,* Seaman J.E.,* Agard N., Hsu G.W., Julien O., Mahrus S., Nguyen H., Shimbo K., Yoshihara H., Zhuang M., Chalkley R.J., Wells J.A. (2013) "The DegraBase: a database of proteolysis in healthy and apoptotic human cells." Mol. Cell. Proteomics 12. 813-824.