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Sensor: Sensing of phage protein
Activator: Unknown
Effector: Unknown
contributors:
- Lucas Paoli
relevantAbstracts:
- doi: 10.1016/j.chom.2022.02.018
- doi: 10.1016/j.chom.2022.02.018
---
# Paris
## Description
PARIS (for Phage Anti-Restriction-Induced System) is a novel anti-phage system. PARIS is found in 4% of prokaryotic genomes. It comprises an ATPase associated with a DUF4435 protein, which can be found either as a two-gene cassette or a single-gene fusion (1).
PARIS (for Phage Anti-Restriction-Induced System) is a novel anti-phage system. It comprises an ATPase associated with a DUF4435 protein, which can be found either as a two-gene cassette or a single-gene fusion :ref{doi=10.1016/j.chom.2022.02.018}.
This system relies on an unknown [Abortive infection](/general-concepts/abortive-infection) mechanism to trigger growth arrest upon sensing a phage-encoded protein (Ocr). Interestingly, the Ocr protein has been found to inhibit R-M systems and BREX systems, making PARIS a suitable defense mechanism against RM resistant and/or BREX resistant phages (1, 2, 3).
## Molecular mechanisms
This system relies on an unknown [Abortive infection](/general-concepts/abortive-infection) mechanism to trigger growth arrest upon sensing a phage-encoded protein (Ocr). Interestingly, the Ocr protein has been found to inhibit R-M systems and BREX systems, making PARIS a suitable defense mechanism against RM resistant and/or BREX resistant phages :ref{doi=0.1016/j.chom.2022.02.018,10.1093/nar/gkaa510,10.1007/BF01036001}.
## Example of genomic structure
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