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Bz-Nle-KRR-AMC is a fluorogenic peptide substrate for yellow fever virus (YFV) non-structural 3 (NS3) and dengue virus (DV) NS2B/3 serine proteases. Upon enzymatic cleavage by YFV NS3 or DV NS2B/3 serine proteases, 7-amino-4-methylcoumarin (AMC) is released and its fluorescence can be used to quantify YFV NS3 or DV NS2B/3 serine protease activity. AMC displays excitation/emission maxima of 340-360/440-460 nm, respectively.

Bz-Nle-Lys-Arg-Arg-AMC can be used for protease activity assay. In 0.1mL Tris-HCl buffer (50 mM, pH 7.8), Bz-Nle-Lys-Arg-Arg-AMC was hydrolyzed, and the release rate of AMC was observed and calculated at λex/λem=380 nm/460 nm[1].

[1] Phoo WW, et al. Crystal structures of full length DENV4 NS2B-NS3 reveal the dynamic interaction between NS2B and NS3. Antiviral Res. 2020 Oct;182:104900. DOI:10.1016/j.antiviral.2020.104900