Activatable CRISPR/CAS9 for spatial and temporal control of genome editing
Disclosed herein is a genetically encoded light- or chemically-activated Cas9 engineered through the site-specific installation of an activatable lysine amino acid. Such activatable Cas9 proteins can be used in CRISPR/Cas9 systems to control gene expression temporally, spatially, or both. Systems, methods, kits, and compositions for manipulation of sequences and/or activities of target sequences are provided. Also provided are methods of directing CRISPR complex formation in cells and methods for selecting specific cells by introducing precise mutations utilizing the CRISPR/Cas9 system.
1. A non-naturally occurring activatable Cas9 protein, comprising an amino acid sequence with at least 80% sequence identity to SEQ ID NO: 39 or SEQ ID NO: 41 and at least one light activatable lysine or at least one chemically activatable lysine located at amino acid position 163, 510, or 866 according to the reference Cas9 sequence set forth as SEQ ID NO: 39.
2. The activatable Cas9 protein of claim 1 , wherein the activatable Cas9 protein comprises:
an amino acid sequence with at least 95% sequence identity to SEQ ID NO: 39 or SEQ ID NO: 41, and the at least one light activatable or chemically activatable lysine is located at amino acid position 163, 510, or 866 according to the reference Cas9 sequence set forth as SEQ ID NO: 39.
3. A non-naturally occurring activatable Cas9 protein, comprising at least one light activatable lysine or at least one chemically activatable lysine wherein the activatable Cas9 protein comprises the amino acid sequence set forth as SEQ ID NO: 39 or 41, and wherein at least one of the lysine residues at amino acid position 163, 510, or 866 of SEQ ID NO: 39 or 41 is a photocaged or a chemically activatable lysine residue.
4. The activatable Cas9 protein of claim 1 , wherein the chemically activatable lysine or the light activatable lysine comprises a compound selected from the following:
5. A kit comprising the activatable Cas9 protein of claim 1 .
6. The kit of claim 5 , further comprising one or more of:
bacterial cell growth media, mammalian cell growth media, OABK, PCK, an isolated nucleic acid molecule encoding a tRNA, an isolated nucleic acid molecule encoding a tRNA synthetase, an isolated guide nucleic acid molecule specific for a target nucleic acid molecule, and phosphine or phosphine derivative.
7. The activatable Cas9 protein of claim 1 , wherein the activatable Cas9 protein comprises:
the light activatable lysine or the chemically activatable lysine located at amino acid position 163 according to the reference Cas9 sequence set forth as SEQ ID NO: 39.
8. The activatable Cas9 protein of claim 1 , wherein the activatable Cas9 protein comprises:
the light activatable lysine or the chemically activatable lysine located at amino acid position 866 according to the reference Cas9 sequence set forth as SEQ ID NO: 39.
9. The activatable Cas9 protein of claim 1 , wherein the chemically activatable lysine comprises ortho-azidobenzyloxycarbonyl lysine (OABK).
10. The activatable Cas9 protein of claim 1 , wherein the light activatable lysine comprises photocaged lysine (PCK).