Abstract: Compositions and methods are provided for the inhibition of the function of RNA guided endonucleases, including the identification and use of such inhibitors. Methods of identifying inhibitor compounds of RNA guided nucleases, assays for detecting nuclease activity and compounds for use therein are also provided.

Abstract: The present inventions generally relate to site-specific delivery of nucleic acid modifiers and includes novel DNA-binding proteins and effectors that can be rapidly programmed to make site-specific DNA modifications. The present inventions also provide a synthetic all-in-one genome editor (SAGE) systems comprising designer DNA sequence readers and a set of small molecules that induce double-strand breaks, enhance cellular permeability, inhibit NHEJ and activate HDR, as well as methods of using and delivering such systems.

Abstract: Compositions and methods for conditionally regulating activities of CRISPR-Cas systems. In some embodiments, the methods comprise providing an inactive guide RNA comprising a regulatory domain bound by a lock nucleic acid different from the guide RNA; and displacing the lock nuclei acid from the regulatory domain by a trigger nucleic acid, thereby activating the guide RNA, wherein the activated guide RNA forms a complex with a Cas enzyme.

Abstract: The need to control the activity and fidelity of CRISPR-associated nucleases has resulted in the demand for inhibitory anti-CRISPR molecules. Current small-molecule inhibitor discovery platforms are not generalizable to multiple nuclease classes, only target the initial step in the catalytic activity, and require high concentration of nuclease, resulting in inhibitors with suboptimal attributes, including poor potency. Herein, Applicants report a high-throughput discovery pipeline consisting of a FRET-based assay that is generalizable to contemporary and emerging nucleases, operates at low nuclease concentration, and targets all catalytic steps. Applicants applied this pipeline to identify BRD7586, a cell-permeable small-molecule inhibitor of SpCas9, that is 2-fold more potent than current inhibitors. Furthermore, unlike the reported inhibitors, BRD7586 enhanced SpCas9 specificity and its activity was independent of the genomic loci, DNA repair pathway, or mode of nuclease delivery.

Abstract: The embodiments disclosed herein utilize fluorescence polarization based preliminary screen to identify a putative set of Cas inhibitors from an initial set of candidate inhibitors. The primary screening assay is followed by secondary screening assay to validate the putative set of inhibitors selected by the preliminary screen. In some embodiments, the present disclosure includes compositions and methods are provided for the inhibition of the function of RNA guided endonucleases, including the identification and use of such inhibitors.

Abstract: Compositions and methods are provided for the inhibition of the function of RNA guided endonucleases, including the identification and use of such inhibitors. Methods of identifying inhibitor compounds of RNA guided nucleases, assays for detecting nuclease activity and compounds for use therein are also provided.

Abstract: The present inventions generally relate to site-specific delivery of nucleic acid modifiers and includes novel DNA-binding proteins and effectors that can be rapidly programmed to make site-specific DNA modifications. The present inventions also provide a synthetic all-in-one genome editor (SAGE) systems comprising designer DNA sequence readers and a set of small molecules that induce double-strand breaks, enhance cellular permeability, inhibit NHEJ and activate HDR, as well as methods of using and delivering such systems.

Abstract: The embodiments disclosed herein utilize fluorescence polarization based preliminary screen to identify a putative set of Cas inhibitors from an initial set of candidate inhibitors. The primary screening assay is followed by secondary screening assay to validate the putative set of inhibitors selected by the preliminary screen. In some embodiments, the present disclosure includes compositions and methods are provided for the inhibition of the function of RNA guided endonucleases, including the identification and use of such inhibitors.

Abstract: Compositions and methods for conditionally regulating activities of CRISPR-Cas systems. In some embodiments, the methods comprise providing an inactive guide RNA comprising a regulatory domain bound by a lock nucleic acid different from the guide RNA; and displacing the lock nuclei acid from the regulatory domain by a trigger nucleic acid, thereby activating the guide RNA, wherein the activated guide RNA forms a complex with a Cas enzyme.