rg-4

H-Arg-4MβNA (H-Arg-4MbNA) is a peptide that serves as a substrate for cathepsin H. The enzyme activity is often detected in gel electrophoresis.

Z-Arg-Arg-4MβNA triacetate serves as a specific substrate for cathepsin B, producing the fluorescent product 4MβNA, which has an excitation wavelength (λ ex) of 355 nm and an emission wavelength (λ em) of 430 nm [1] [2].

Z-Gly-Pro-Arg-4MβNA is a thrombin substrate that, when cleaved by thrombin, releases 4-methoxy-2-naphthylamine (4MβNA). The liberated 4MβNA reacts with 5-nitrosalicylaldehyde, forming an insoluble yellow fluorescent product, which indicates the site of thrombin activity [1].