ArticleScientific reports2025
Structural basis of dimerization and cascade formation by Cas5.
Article in Scientific reports, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
CRISPR-Cas systems are essential for prokaryotic adaptive immune mechanisms; however, the structural details of many subtype-specific components remain unclear. Herein, we report the crystal structure and biophysical characterization of Cas5 from Moraxella bovoculi (MboCas5), a component of the type I-C CRISPR-Cas system. We found that M. bovoculi encodes both type I-C and type III-B systems, and that MboCas5 forms a dimer that is stabilized by key interactions, including a salt bridge between R72 and D167. Structural comparisons with other Cas5 homologs and AlphaFold 3 predictions further validated the unique dimer configuration, suggesting that it is conserved across species. Additionally, structural comparison revealed a highly flexible loop region, which likely undergoes conformational changes upon Cascade assembly and might mediate interactions with Cas8 and crRNA. Overall, the findings provided structural and mechanistic insights into Cas5 function and could potentially contribute to our understanding of the assembly of type I-C Cascade complexes.
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