The OmniMMP™ RED substrate offers key advantages over other MMP substrates. 1) Emission at the red end of
the spectrum (576 nm after excitation at 545 nm) avoids the interference at lower wavelengths often exhibited by
screening compounds, and by substances commonly found in biological samples and tissue culture medium. 2) MMP
substrate peptides display poor aqueous solubility, often with Kms near their limits of solubility, making enzyme and
inhibitor kinetics difficult. MMP Kms for OmniMMP™ RED substrate are below its solubility limit. 3) In addition to the
efficient binding as exhibited by low Kms, OmniMMP™ RED is avidly cleaved by MMPs, with kcat/Kms in the range of
104-106 M-1sec-1. 4) The ultra-strong fluorescence of OmniMMPTM RED allows for substrate concentrations much
lower than the Km, a condition generally desirable in inhibitor screening assays.