Ac-KQL-AMC is a fluorogenic substrate that can be used to quantify Trypsin-like activity, resulting in detectable fluorescence when cleaved by the proteasome[1].
References
[1] Miyauchi S, et al. Human papillomavirus E5 suppresses immunity via inhibition of the immunoproteasome and STING pathway. Cell Rep. 2023 May 30;42(5):112508. DOI:10.1016/j.celrep.2023.112508
