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Gene Digital Circuits Based on CRISPR-Cas Systems and Anti-CRISPR Proteins
Published on: October 18, 2022
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Structural analysis of predicted anti-CRISPR, ACZ01644
So Eun Park1, Jae-Hee Jeong2, Yeon-Gil Kim2
1College of Pharmacy, Chung-Ang University, Seoul, 06974, Republic of Korea; Department of Global Innovative Drugs, Graduate School of Chung-Ang University, Seoul, 06974, Republic of Korea.
Biochemical and Biophysical Research Communications
|December 26, 2025
Summary
Researchers characterized ACZ01644, a potential anti-CRISPR (Acr) protein. Its unique structure and trimeric assembly were revealed, but it did not inhibit Cas9, suggesting novel roles in CRISPR-Cas regulation.
Area of Science:
- Molecular Biology
- Structural Biology
- Microbial Immunity
Background:
- CRISPR-Cas systems provide adaptive immunity in prokaryotes.
- Anti-CRISPR (Acr) proteins are phage-encoded inhibitors of CRISPR-Cas.
- ACZ01644 was previously predicted to be an Acr protein.
Purpose of the Study:
- To determine the structure and biochemical properties of ACZ01644.
- To investigate the inhibitory activity of ACZ01644 against CRISPR-Cas systems.
Main Methods:
- X-ray crystallography for structural determination.
- Biochemical assays to assess oligomerization and DNA cleavage inhibition.
- In vitro testing of ACZ01644 against Cas9 activity.
Main Results:
- ACZ01644 possesses a unique cone-shaped fold, distinct from known Acr families.
- Biochemical analysis showed ACZ01644 forms a trimer in solution.
- ACZ01644 did not inhibit Cas9-mediated DNA cleavage in vitro.
Conclusions:
- ACZ01644 represents a novel structural class of putative anti-CRISPR proteins.
- Its lack of Cas9 inhibition suggests alternative functions or cofactor dependency.
- Further research is needed to elucidate the biological role of ACZ01644 in CRISPR-Cas regulation.
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