Discovering novel chemical inhibitors of human cyclophilin A: Virtual screening, synthesis, and bioassay
摘要:
Cyclophilin A (CypA) is a member of cyclophilins, a family of the highly homologous peptidyl prolyl cis-trans isomerases (PPIases), which can bind to cyclosporin A (CsA). CypA plays critical roles in various biological processes, including protein folding, assembly, transportation, regulation of neuron growth, and HIV replication. The discovery of CypA inhibitor is now of a great special interest in the treatment of immunological disorders. In this study, a series of novel small molecular CypA inhibitors have been discovered by using structure-based virtual screening in conjunction with chemical synthesis and bioassay. The SPECS-1 database containing 85,000 small molecular compounds was searched by virtual screening against the crystal structure of human CypA. After SPR-based binding affinity assay, 15 compounds were found to show binding affinities to CypA at submicro-molar or micromolar level (compounds 1-15). Seven compounds were selected as the starting point for the further structure modification in considering binding activity, synthesis difficulty, and structure similarity. We thus synthesized 40 new small molecular compounds (1-6, 15, 16a-q, 17a-d, and 18a-I), and four of which (compounds 16b, 16h 16k,. and 18g) showed high CypA PPIase inhibition activities with IC50S of 2.5-6,2 mu M. Pharmacological assay indicated that these four Compounds demonstrated somewhat inhibition activities against the proliferation of spleen cells. (c) 2005 Elsevier Ltd. All rights reserved.
Copper‐Catalyzed C4‐selective Carboxylation of Pyridines with CO2 via Pyridylphosphonium Salts
作者:Shibiao Tang、Zezhao Liu、Jiakai Zhang、Bin Li、Baiquan Wang
DOI:10.1002/anie.202318572
日期:2024.3.22
A practical copper-catalyzed C4-selective carboxylation of pyridines with CO2 via pyridylphosphonium salts has been developed. The C−P bond carboxylation with CO2 was achieved for the first time. This work represents a novel mode of site-selective carboxylation of pyridines, which may be a useful approach in new drug design and discovery in the future.
Discovery of Dap-3 Polymyxin Analogues for the Treatment of Multidrug-Resistant Gram-Negative Nosocomial Infections
作者:Thomas V. Magee、Matthew F. Brown、Jeremy T. Starr、David C. Ackley、Joseph A. Abramite、Jiri Aubrecht、Andrew Butler、Jared L. Crandon、Fadia Dib-Hajj、Mark E. Flanagan、Karl Granskog、Joel R. Hardink、Michael D. Huband、Rebecca Irvine、Michael Kuhn、Karen L. Leach、Bryan Li、Jian Lin、David R. Luke、Shawn H. MacVane、Alita A. Miller、Sandra McCurdy、James M. McKim、David P. Nicolau、Thuy-Trinh Nguyen、Mark C. Noe、John P. O’Donnell、Scott B. Seibel、Yue Shen、Antonia F. Stepan、Andrew P. Tomaras、Paul C. Wilga、Li Zhang、Jinfeng Xu、Jinshan Michael Chen
DOI:10.1021/jm400416u
日期:2013.6.27
We report novel polymyxin analogues with improved antibacterial in vitro potency against polymprin resistant recent clinical isolates of Acinetobacter baumannii and Pseudomonas aeruginosa. In addition, a human renal cell in vitro assay (hRPTEC) was used to inform structure-toxicity relationships and further differentiate analogues. Replacement of the Dab-3 residue with a Dap-3 in combination with a relatively polar 6-oxo-1-phenyl-1,6-dihydropyridine-3-carbonyl side chain as a fatty acyl replacement yielded analogue 5x, which demonstrated an improved in vitro antimicrobial and renal cytotoxicity profiles relative to polymyxin B (PMB). However, in vivo PK/PD comparison of 5x and PMB in a murine neutropenic thigh model against P. aeruginosa strains with matched MICs showed that 5x was inferior to PMB in vivo, suggesting a lack of improved therapeutic index in spite of apparent in vitro advantages.