Sensing Enzymatic Activity by Exposure and Selection of DNA-Encoded Probes

A sensing approach is applied to encode quantitative enzymatic activity information into DNA sequence populations. The method utilizes DNA‐linked peptide substrates as activity probes. Signal detection involves chemical manipulation of a probe population downstream of sample exposure and application of purifying, selective pressure for enzyme products. Selection‐induced changes in DNA abundance indicate sample activity. The detection of protein kinase, protease, and farnesyltransferase activities is demonstrated. The assays were employed to measure enzyme inhibition by small molecules and activity in cell lysates using parallel DNA sequencing or quantitative PCR. This strategy will allow the extensive infrastructure for genetic analysis to be applied to proteomic assays, which has a number of advantages in throughput, sensitivity, and sample multiplexing. An DNA geknüpfte Peptidsubstrate dienen als Sonden für Enzymaktivität. Durch Kodierung für die Probe lässt sich die Aktivität per DNA‐Analyse erkennen. Sondenphänotypen können durch Behandlung mit dem Enzym vom Substrat zum Produkt geändert werden, was sich auf ihre Verfügbarkeit in einem nachgeschalteten Selektionsschritt auswirkt. Selektionsinduzierte Veränderungen der Sondenhäufigkeit in einer Population quantifizieren die Enzymaktivität.