Summary
Protein degradation is mediated predominantly through the ubiquitin–proteasome pathway. The importance of the proteasome in regulating degradation of proteins involved in cell-cycle control, apoptosis, and angiogenesis led to the recognition of the proteasome as a therapeutic target for cancer (1–4). The proteasome is also essential for degrading misfolded and aberrant proteins, and impaired proteasome function has been implicated in diseases such as Parkinson’s and Alzheimer’s citech13:bib05. The importance of the proteasome for general cell homeostasis has been established, and the 2004 Nobel Prize for Chemistry honored the researchers that discovered the ubiquitin–proteasome pathway. Robust, sensitive assays are essential for monitoring proteasome activity and for developing inhibitors of the proteasome. Peptide-conjugated fluorophores are widely used as substrates for monitoring proteasome activity, but fluorogenic substrates can exhibit significant background and can be problematic for screening because of cellular autoflorescence or fluorescent library compounds. To address these issues, we developed a homogeneous, bioluminescent method that combines peptide-conjugated aminoluciferin substrates and a stabilized luciferase. We have developed homogeneous, bioluminescent assays for all three proteasome activities, the chymotrypsin-like, trypsin-like, and caspase-like, using purified proteasome. We have also applied this technology to a cellular assay using the substrate for the chymotrypsin-like activity in combination with a selective membrane permeabilization step (patent pending). The proteasome assays are designed in a simple “add and read” format and have been tested in 96- and 384-well plates. The bioluminescent, coupled-enzyme format enables sensitive and rapid protease assays ideal for inhibitor screening.
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References
Adams, J., Palombella, V.J., Sausville, E.A., Johnson, J., et al. (1999) Proteasome inhibitors: a novel class of potent and effective antitumor agents. Cancer Res. 59, 2615–2622.
Adams, J. (2002) Development of the proteasome inhibitor PS-341. Oncologist 7, 9–16.
Voorhees, P.M., Dees, E.C., O’Neil, B., and Orlowski, R.Z. (2003) The proteasome as a target for cancer therapy. Clin. Cancer Res. 9, 6316–6325.
Burger, A.M., and Seth, A.K. (2004) The ubiquitin-mediated protein degradation pathway in cancer: therapeutic implications. Eur. J. Cancer 4, 2217–2229.
Gu, Z., Nakamura, D., Yao, D., Shi, Z.-Q., and Lipton, S.A. (2005) Nitrosative and oxidative stress links dysfunctional ubiquitination to Parkinson’s disease. Cell Death Diff. 12, 1202–1204.
Baumeister, W., Walz, J., Zühl, F., and Seemüller, E. (1998) The proteasome: paradigm of a self-compartmentalizing protease. Cell 92, 367–380.
Wolf, D.H., and Hilt, W. (2004) The proteasome: a proteolytic nanomachine of cell regulation and waste disposal. Biochem. Biophys. Acta 1695, 19–31.
Glickman, M.H., and Ciechanover, A. (2002) The ubiquitin-proteasome proteolytic pathway: destruction for the sake of construction. Physiol. Rev. 82, 373–428.
Rajkumar, S.V., Richardson, P.G., Hideshima, T., and Anderson, K.C. (2005) Proteasome inhibition as a novel therapeutic target in human cancer. J. Clin. Oncol. 23, 630–639.
Nussbaum, A.K., Dick, T.P., Keilholz, W., Schirle, M., et al. (1998) Cleavage motifs of the yeast 20S proteasome subunits deduced from digest of enolase I. Proc. Natl. Acad. Sci. U. S. A. 95, 12504–12509.
Rechsteiner, M., and Hill, C.P. (2005) Mobilizing the proteolytic machine: cell biological roles of proteasome activators and inhibitors. Trends Cell Biol. 15, 27–33.
Kisselev, A.F., Kaganovich, D., and Goldberg A.L. (2002) Binding of hydrophobic peptides to several non-catalytic sites promotes peptide hydrolysis by all active sites of 20S proteasomes. J. Biol. Chem. 277, 22260–22270.
Kisselev, A.F., Garcia-Calvo, M., Overkleeft, H.S., Peterson, E., et al. (2003) The caspase-like sites of proteasomes, their substrate specificity, new inhibitors and substrates, and allosteric interactions with the trypsin-like sites. J. Biol. Chem. 278, 35869–35877.
Ciechanover, A. (2005) Intracellular protein degradation: from a vague idea thru the lysosome and the ubiquitin-proteasome system and onto human diseases and drug targeting. Cell Death Diff. 12, 1178–1190.
Chauhan, D., Hideshima, T., and Anderson, K.C. (2005) Proteasome inhibition in multiple myeloma: therapeutic implication. Ann. Rev. Pharmacol. Toxicol. 45, 465–476.
Chauhan, D., Catley, L., Li, G., Podar, K., et al. (2005) A novel orally active proteasome inhibitor induces apoptosis in multiple myeloma cells with mechanisms distinct from Bortezomib. Cancer Cell 8, 407–419.
Richardson, P.G., Barlogie, B., Berenson, J., Singhal, S., et al. (2003) Phase 2 study of bortezomib in relapsed, refractory myeloma. N. Engl. J. Med. 348, 2609–2617.
Papandreou, C.N., and Logothetis, C.J. (2004) Bortezomib as a potential treatment for prostate cancer. Cancer Res. 64, 5036–5043.
Leytus, S.P., Melhado, L.L., and Mangel, W.F. (1983) Rhodamine-based compounds as fluorogenic substrates for serine proteinases. Biochem. J. 209, 299–307.
Liu, J., Bhalgat, M., Zhang, C., Diwu, Z., Hoyland, B., and Klaubert, D.H. (1999) Fluorescent molecular probes V: a sensitive caspase-3 substrate for fluorometric assays. Bioorg. Med. Chem. Lett. 9, 3231–3236.
Grant, S.K., Sklar, J.G., and Cummings, R.T. (2002) Development of novel assays for proteolytic enzymes using rhodamine-based fluorogenic substrates. J. Biomol. Screen. 7, 531–540.
O’Brien, M.A., Daily, W.J., Hesselberth, P.E., Moravec, R.A., et al. (2005). Homogeneous, bioluminescent protease assays: caspase-3 as a model. J. Biomol. Screen. 10, 137–148.
Lightcap, E.S., Mccormack, T.A., Pien, C.S., Chau, V., et al. (2000) Proteasome inhibition measurements: clinical application. Clin. Chem. 46, 673–683.
Fenteany, G., Standaert, R.F., Lane, W.S., Choi, S., et al. (1995) Inhibition of proteasome activities and subunit-specific amino-terminal threonine modification by lactacystin. Science 268, 726–731.
Dick, L., Cruikshank, A., Grenier, L., Melandri, F.D., et al. (1996) Mechanistic studies on the inactivation of the proteasome by lactacystin: a central role for clasto-lactacystin UPbeta-lactone. J. Biol. Chem. 271, 7273–7276.
Dick, L., Cruikshank, A., Destree, A.T., Grenier, L., et al. (1997) Mechanistic studies on the inactivation of the proteasome by lactacystin in cultured cells. J. Biol. Chem. 272, 182–188.
Meng, L., Mohan, R.L., Kwok, B.H.B., Elofsson, M., Sin, N., and Crews, C.M. (1999) Epoxomicin, a potent and selective proteasome inhibitor, exhibits in vivo anti-inflammatory activity. Proc. Natl. Acad. Sci. U. S. A. 96, 10403–10408.
Corey, E.J., and Li, W.-D.Z. (1999) Total synthesis and biological activity of lactacystin, omuralike and analogs. Chem. Pharm. Bull. 47, 1–10.
Wojcik, C., and Napoli, M.D. (2004) Ubiquitin-proteasome system and proteasome inhibition: new strategies in stroke therapy. Stroke 35, 1506–1518.
Acknowledgments
The authors thank colleagues at Promega Biosciences, Michael Scurria, Laurent Bernad, Bill Dailey, and James Unch, for synthesizing the bioluminescent proteasome substrates. We are indebted to Keith Wood and Dieter Klaubert for the homogeneous, bioluminescent assay concept. We also thank Kay Rashka, Sandra Hagen, Jeri Culp, Debra Lange, Brian McNamara, Anissa Moraes, and Pam Guthmiller for translating the concepts into products.
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O′Brien, M.A., Moravec, R.A., Riss, T.L., Bulleit, R.F. (2008). Homogeneous, Bioluminescent Proteasome Assays. In: Mor, G., Alvero, A.B. (eds) Apoptosis and Cancer. Methods in Molecular Biology™, vol 414. Humana Press. https://doi.org/10.1007/978-1-59745-339-4_13
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DOI: https://doi.org/10.1007/978-1-59745-339-4_13
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