RESUMEN
Hundreds of target specific peptides are routinely discovered by peptide display platforms. However, due to the high cost of peptide synthesis only a limited number of peptides are chemically made for further analysis. Here we describe an accurate and cost effective method to bin peptides on-phage based on binding region(s), without any requirement for peptide or protein synthesis. This approach, which integrates phage and yeast display platforms, requires display of target and its alanine variants on yeast. Flow cytometry was used to detect binding of peptides on-phage to the target on yeast. Once hits were identified, they were synthesized to confirm their binding region(s) by HDX (Hydrogen deuterium exchange) and crystallography. Moreover, we have successfully shown that this approach can be implemented as part of a panning process to deplete non-functional peptides. This technique can be applied to any target that can be successfully displayed on yeast; it narrows down the number of peptides requiring synthesis; and its utilization during selection results in enrichment of peptide population against defined binding regions on the target.
Asunto(s)
Técnicas de Visualización de Superficie Celular/métodos , Biblioteca de Péptidos , Alanina/genética , Alanina/metabolismo , Bacteriófagos/genética , Bacteriófagos/metabolismo , Técnicas de Visualización de Superficie Celular/economía , Análisis Costo-Beneficio , Citometría de Flujo/economía , Citometría de Flujo/métodos , Subunidad p40 de la Interleucina-12/genética , Subunidad p40 de la Interleucina-12/metabolismo , Mutación , Unión Proteica/genética , Proteínas Recombinantes/genética , Proteínas Recombinantes/metabolismo , Reproducibilidad de los Resultados , Saccharomyces cerevisiae/genética , Saccharomyces cerevisiae/metabolismoRESUMEN
A series of oxamyl dipeptides were optimized for pan caspase inhibition, anti-apoptotic cellular activity and in vivo efficacy. This structure-activity relationship study focused on the P4 oxamides and warhead moieties. Primarily on the basis of in vitro data, inhibitors were selected for study in a murine model of alpha-Fas-induced liver injury. IDN-6556 (1) was further profiled in additional in vivo models and pharmacokinetic studies. This first-in-class caspase inhibitor is now the subject of two Phase II clinical trials, evaluating its safety and efficacy for use in liver disease.
Asunto(s)
Inhibidores de Caspasas , Hepatopatías/tratamiento farmacológico , Ácidos Pentanoicos/síntesis química , Adulto , Alanina Transaminasa/sangre , Animales , Apoptosis/efectos de los fármacos , Aspartato Aminotransferasas/sangre , Disponibilidad Biológica , Caspasa 3 , Colestasis/tratamiento farmacológico , Colestasis/patología , Ensayos Clínicos Fase I como Asunto , Semivida , Hepatitis C Crónica/tratamiento farmacológico , Hepatocitos/efectos de los fármacos , Hepatocitos/patología , Humanos , Células Jurkat , Hígado/efectos de los fármacos , Hígado/patología , Hepatopatías/enzimología , Hepatopatías/etiología , Ratones , Ácidos Pentanoicos/química , Ácidos Pentanoicos/farmacología , Ratas , Relación Estructura-ActividadRESUMEN
Various heterocyclic hetero-methyl ketones of the 1-naphthyloxyacetyl-Val-Asp backbone have been prepared. A study of their structure-activity relationship (SAR) related to caspase-1, -3, -6, and -8 is reported. Their efficacy in a cellular model of cell death is also discussed. Potent broad-spectrum caspase inhibitors have been identified.
Asunto(s)
Inhibidores de Caspasas , Muerte Celular/efectos de los fármacos , Inhibidores de Cisteína Proteinasa/farmacología , Compuestos Heterocíclicos/farmacología , Cetonas/farmacología , Animales , Ácido Aspártico/química , Células Cultivadas , Compuestos Heterocíclicos/síntesis química , Cetonas/síntesis química , Ratones , Modelos Biológicos , Naftoles/química , Relación Estructura-Actividad , Valina/químicaRESUMEN
Structural modifications were made to a previously described acyl dipeptide caspase inhibitor, leading to the oxamyl dipeptide series. Subsequent SAR studies directed toward the warhead, P2, and P4 regions of this novel peptidomimetic are described herein.
Asunto(s)
Inhibidores de Caspasas , Dipéptidos/síntesis química , Dipéptidos/farmacología , Apoptosis/efectos de los fármacos , Carbamatos , Línea Celular , Humanos , Concentración 50 Inhibidora , Cinética , Enfermedades Neurodegenerativas/tratamiento farmacológico , Accidente Cerebrovascular/tratamiento farmacológico , Relación Estructura-ActividadRESUMEN
Various aryloxy methyl ketones of the 1-naphthyloxyacetyl-Val-Asp backbone have been prepared. A systematic study of their structure-activity relationship (SAR) related to caspases 1, 3, 6, and 8 is reported. Highly potent irreversible broad-spectrum caspase inhibitors have been identified. Their efficacy in cellular models of cell death and inflammation are also discussed.