Download MendeleyCrystal Structure of Streptococcus pyogenes Cas1 and Its Interaction with Csn2 in the Type II CRISPR-Cas System
Ka, D., Lee, H., Jung, Y.D., Kim, K., Seok, C., Suh, N., Bae, E.(2016) Structure 24: 70-79
- PubMed: 26671707
- DOI: https://doi.org/10.1016/j.str.2015.10.019
- Primary Citation of Related Structures:
4ZKJ - PubMed Abstract:
CRISPRs and Cas proteins constitute an RNA-guided microbial immune system against invading nucleic acids. Cas1 is a universal Cas protein found in all three types of CRISPR-Cas systems, and its role is implicated in new spacer acquisition during CRISPR-mediated adaptive immunity. Here, we report the crystal structure of Streptococcus pyogenes Cas1 (SpCas1) in a type II CRISPR-Cas system and characterize its interaction with S. pyogenes Csn2 (SpCsn2). The SpCas1 structure reveals a unique conformational state distinct from type I Cas1 structures, resulting in a more extensive dimerization interface, a more globular overall structure, and a disruption of potential metal-binding sites for catalysis. We demonstrate that SpCas1 directly interacts with SpCsn2, and identify the binding interface and key residues for Cas complex formation. These results provide structural information for a type II Cas1 protein, and lay a foundation for studying multiprotein Cas complexes functioning in type II CRISPR-Cas systems.
Organizational Affiliation:
Department of Agricultural Biotechnology, Seoul National University, Seoul 151-921, Korea.
