Cathepsin O is a cysteine protease and a member of the cathepsin family and papain superfamily. This proteolytic enzyme is involved in cellular protein degradation and turnover. The recombinant form of this enzyme was shown to degrade synthetic peptides typically used as substrates for cysteine proteinases and its proteolytic activity was abolished by an inhibitor of cyteine proteinase.
^Santamaría I, Pendás AM, Velasco G, López-Otín C (October 1998). "Genomic structure and chromosomal localization of the human cathepsin O gene (CTSO)". Genomics53 (2): 231–4. doi:10.1006/geno.1997.5180. PMID9790772.
Shi GP, Chapman HA, Bhairi SM, et al. (1995). "Molecular cloning of human cathepsin O, a novel endoproteinase and homologue of rabbit OC2.". FEBS Lett.357 (2): 129–34. doi:10.1016/0014-5793(94)01349-6. PMID7805878.
Strausberg RL, Feingold EA, Grouse LH, et al. (2002). "Generation and initial analysis of more than 15,000 full-length human and mouse cDNA sequences". Proc. Natl. Acad. Sci. U.S.A.99 (26): 16899–903. doi:10.1073/pnas.242603899. PMC139241. PMID12477932.
Velasco G, Ferrando AA, Puente XS, et al. (1994). "Human cathepsin O. Molecular cloning from a breast carcinoma, production of the active enzyme in Escherichia coli, and expression analysis in human tissues". J. Biol. Chem.269 (43): 27136–42. PMID7929457.
Gerhard DS, Wagner L, Feingold EA, et al. (2004). "The Status, Quality, and Expansion of the NIH Full-Length cDNA Project: The Mammalian Gene Collection (MGC)". Genome Res.14 (10B): 2121–7. doi:10.1101/gr.2596504. PMC528928. PMID15489334.