Journal: eLife
Article Title: Immunoproteasome functions explained by divergence in cleavage specificity and regulation
doi: 10.7554/eLife.27364
Figure Lengend Snippet: Protocols for synthesis of the Fmoc-ACC fluorophore and its coupling to Rink amide resin have been described. ( a ) 20% 4-methylpiperidine/DMF; ( b ) Fmoc-protected P1 amino acid (5 eq.), HATU (5 eq.), and 2,4,6-collidine (5 eq.), DMF, 24 hr, or Fmoc-protected P2, P3, or P4 amino acid (6.5 eq.), HBTU (6.5 eq.), and N-methylmorpholine (13 eq.), DMF, 1 hr; ( c ) for acetyl (Ac): acetic anhydride/TEA/DMF/DCM (1:1:5:5), for N-morpholinyl ( m ): 4-morpholinylacetic acid hydrochloride (6.5 eq.), HBTU (6.5 eq.), and N-methylmorpholine (26 eq.), and for 5-methylisoxazolyl (iso): 5-methylisoxazole-3-carboxylic acid (6.5 eq.), HBTU (6.5 eq.), and N-methylmorpholine (13 eq.); ( d ) TFA/H 2 O/triisopropylsilane (95:2.5:2.5).
Article Snippet: For the 14-mer sequences, double couplings were performed using Fmoc-amino acid (5 eq.), HCTU (5 eq.), and N-methylmorpholine (20 eq.) with a 96-channel Syro II automated peptide synthesizer (Biotage).
Techniques: