Cas4
Cas4 is an endonuclease found in some CRISPR systems that is used as part of the spacer acquisition stage.
| CRISPR-associated protein 4 | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Identifiers | |||||||||
| Symbol | cas4 | ||||||||
| Pfam | PF01930 | ||||||||
| InterPro | IPR022765 | ||||||||
| |||||||||
Cas4 is required for efficient prespacer processing by forming a Cas4-Cas1-Cas2 complex. [1] In this complex, Cas4 cuts double-stranded substrates with long 3'-overhangs through site-specific endonucleolytic cleavage. [2] Cas4 closely interacts with the integrase active sites of Cas1, recognizes PAM sequences within the substrate and cleaves precisely upstream of them, ensuring the acquisition of functional spacers. [2] [1]
References
- Lee H, Dhingra Y, Sashital DG (April 2019). "The Cas4-Cas1-Cas2 complex mediates precise prespacer processing during CRISPR adaptation". eLife. 8. doi:10.7554/eLife.44248. PMID 31021314.
- Lee H, Zhou Y, Taylor DW, Sashital DG (April 2018). "Cas4-Dependent Prespacer Processing Ensures High-Fidelity Programming of CRISPR Arrays". Molecular Cell. 70 (1): 48–59.e5. doi:10.1016/j.molcel.2018.03.003. PMID 29602742.
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