Evaluation of superior BACE1 cleavage sequences containing unnatural amino acids
摘要:
A recombinant form of BACE1 (beta-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 K(m) = 5.5 mu M and k(cat) = 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 P(2) to P(1') was a superior cleavage sequence. (C) 2011 Elsevier Ltd. All rights reserved.