A biotinylated derivative of the anti-tumor agent camptothecin (CPT) was synthesized and used in a phage display assay to identify drug-binding sequences. After three rounds of selection using C20-biotinylated CPT (CPT-20-B) as bait, a CPT-20-B-binding sequence, NSSQSARR, was identified. (c) 2005 Elsevier Ltd. All rights reserved.
Synthesis and antitumor activity of biotinylated camptothecin derivatives as potent cytotoxic agents
designed and synthesized. The key to the synthesis was achieved by employing an esterification reaction and click chemistry. All of the new derivatives were tested for cytotoxicity against five human tumor cell lines, including HL-60, SMMC-7721, A-549, MCF-7, and SW480 with IC50 values ranging from 0.13 to 21.53 μM. Most of the derivatives exhibited potent cytotoxicity, especially compound 17 (IC50 = 0