Mca-(Asn,Leu)-Amyloid beta/A4 Protein Precursor,,,€ (667-676)-Lys(Dnp)-Arg-Arg amide
Mca-SEVNLDAEFR-K(Dnp)-RR-NH2, also knowm as Mca-(Asn,Leu)-Amyloid beta/A4 Protein Precursor,,,€ (667-676)-Lys(Dnp)-Arg-Arg amide, is a Beta-secretase 1 (BACE-1) peptide FRET substrate, containing the Swedish Lys-Met/Asn-Leu mutation of the amyloid precursor protein (APP) beta-secretase cleavage site. Cleavage at -Leu-Asp- of Mca-SEVNLDAEFR-K(Dnp)-RR-NH2 liberates the highly fluorescent 7-methoxycoumarin (Mca) fragment from the proximity quenching effect of the 2,4-dinitrophenyl (Dnp) internal quencher resulting in a large and easily detectable increase in fluorescence intensity.