Design and synthesis of bombykol analogues for probing pheromone-binding protein–ligand interactions
摘要:
Mono-, difluorinated, and thioanalogues of Bombyx mori female sex pheromones (bombykol, 1) were designed according to the ab initio calculations. These rationally designated analogues were synthesized using hydroboration and Sonogashira coupling strategy via (5E,7Z)-undecadien-1-ol (10) as a common intermediate. A new simplified binding assay based on nanoLC-linear ion trap ESI-MS for quantifying complexation of the B. mori pheromone-binding protein (BmPBP) with native (1) and prepared analogues was developed. The binding properties of native 1 and thioanalogue 4 with PBP were studied in detail. The dissociation constant (K-D) of 1 and 4 was determined to be 2.1 x 10(-6) M and 2.4 x 10(-6) M, respectively. The similar values for both ligands correlated with ab initio calculations. The new binding assay could be used to determine the K-D of other PBPs. (C) 2008 Elsevier Ltd. All rights reserved.
Novel Antiviral Activity of l-Dideoxy Bicyclic Nucleoside Analogues versus Vaccinia and Measles Viruses in Vitro
摘要:
Dideoxy bicyclic pyrimidine nucleoside analogues (ddBCNAs) with D-chirality have previously been described by us to inhibit replication of human cytomegalovirus. We herein report for the first time that activity against vaccinia virus (VACV) was achieved using novel L-analogues. A structure-activity relationship was established: Antiviral activity versus VACV was highest with an ether side chain with an optimum of n-C9H18-O-n-C5H11. This gave an IC50 of 190 nM, a 60-fold enhancement over the FDA-approved antiviral cidofovir. Interestingly, L-ddBCNAs also inhibit wild type measles virus syncytia formation with a TCID50 of 7.5 mu M for the lead compound. We propose that L-ddBCNAs represent significant innovative antiviral candidates versus measles and poxviruses, and we suggest a mechanism of action versus one or more cellular targets that are essential for viral replication.