Evaluation of superior BACE1 cleavage sequences containing unnatural amino acids

A recombinant form of BACE1 (β-site amyloid precursor protein cleaving enzyme-1) corresponding to positions 46–454 of the extracellular domain of the original membrane enzyme was prepared. The recombinant BACE1 (rBACE1) had the kinetic parameters Km = 5.5 μM and kcat = 1719 s−1. Using several libraries of substrates containing unnatural amino acids, the specificity of rBACE1 was evaluated. LC/MS of digests derived from the libraries clarified that a dodecapeptide containing unnatural amino acids at P2 to P1′P1′ was a superior cleavage sequence.

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