摘要：We previously demonstrated that we could hijack the fungal pheromone signaling pathway to provide a living yeast biosensor where peptide biomarkers were recognized by G-protein-coupled receptors and engineered to transcribe a ***,we demonstrated that the protease could be reintroduced to the biosensor to provide a simple mechanism for distinguishing single-amino-acid changes in peptide ligands that,otherwise,would likely be difficult to detect using binding-based *** characterized the dose–response curves for five fungal pheromone G-protein-coupled receptors,peptides,and proteases—Saccharomyces cerevisiae,Candida albicans,Schizosaccharomyces pombe,Schizosaccharomyces octosporus,and Schizosaccharomyces *** scanning was carried out for the most selective of these—*** and ***—with and without the *** peptide variants were discovered,which showed diminished cleavage by the protease(CaPep2A and CaPep2A13A).Those peptides were then distinguished by utilizing the biosensor strains with and without the protease,which selectively cleaved and altered the apparent concentration of peptide required for half-maximal activation for 2 peptides—CaPep and CaPep13A,respectively—by more than one order of *** results support the hypothesis that the living yeast biosensor with a sequence-specific protease can translate single-amino-acid changes into more than one order of magnitude apparent shift in the concentration of peptide required for half-maximal *** further engineering by computational modeling and directed evolution,the biosensor could likely distinguish a wide variety of peptide sequences beyond the alanine scanning carried out *** the future,we envision incorporating proteases into our living yeast biosensor for use as a point of care diagnostic,a scalable communication language,and other applications.

摘要：目的探讨血管紧张素受体拮抗剂能否预防阿尔茨海默病和老年痴呆症，或同时减少两种疾病的进展。设计前瞻性队列分析。资料来源2002—2006年美国退伍军人数据库。