The design, synthesis, and initial evaluation of benzophenone-containing peptides as potential photoaffinity labels of oligosaccharyltransferase
作者:Tong Xu、Hemant Khanna、James K. Coward
DOI:10.1016/s0968-0896(98)00135-7
日期:1998.10
The benzophenone photophore was incorporated into protected tripeptides and tetrapeptides as photoactivatable probes to study the multimeric enzyme oligosaccharyltransferase (OST). These peptides contain the -Asn-X-Thr- sequon which is required for OST-catalyzed N-glycosylation. Two tripeptides, Bz-Asn-Bpa-Thr-NH2 (3b) and Bz-Asn-Lys[N-epsilon-(4-Bz)Bz]-Thr-NH2 (4b), were found to be good OST substrates. They were competitive inhibitors versus standard peptide substrate [C-14]Bz-Asn-Leu-Thr-NH2 and their K-i values were determined to be 41 +/- 61 mu M and 21 +/- 6 mu M, respectively, using synthetic (GlcNAc)(2)-PP-dolichol.. (C) 1998 Elsevier Science Ltd. All rights reserved.