AimP encodes a small peptide that functions as the communication signal in the phage arbitrium system, the first discovered quorum-sensing system in bacteriophages. The gene produces a 43-amino acid precursor that is secreted and processed into a mature 6-amino acid peptide (SAIRGA in phi3T). This peptide accumulates extracellularly during phage infection cycles and, when reimported into bacterial cells via the OPP transporter, binds to the viral AimR transcriptional regulator. High concentrations of AimP peptide promote lysogeny by preventing AimR from activating the aimX locus, while low concentrations favor lytic replication. This represents a population-level decision-making system where phages communicate to coordinate their infection strategy based on the density of previous infections.
| GO Term | Evidence | Action | Reason |
|---|---|---|---|
| GO:0005576 extracellular region | IEA GO_REF:0000044 | ACCEPT | Summary: Accurate localization. The mature AimP peptide is secreted to the extracellular space where it accumulates as part of the quorum sensing mechanism. The precursor has a signal peptide for Sec-dependent secretion. Supporting Evidence: PMID:28099413 the phage produces a six amino-acids-long communication peptide that is released into the medium file:BPPHT/AimP/AimP-falcon-research.md See deep research file for comprehensive analysis |
| GO:0098689 latency-replication decision | IEA GO_REF:0000043 | ACCEPT | Summary: Core function. AimP is essential for the lysis-lysogeny decision in phage phi3T. High concentrations promote lysogeny, low concentrations favor lysis. Supporting Evidence: PMID:28099413 Communication between viruses guides lysis-lysogeny decisions |
| GO:0098689 latency-replication decision | IDA PMID:28099413 Communication between viruses guides lysis-lysogeny decision... | ACCEPT | Summary: Experimentally confirmed core function. Direct experimental evidence shows AimP controls the phage lysis-lysogeny decision through the arbitrium communication system. This is the key discovery establishing viral quorum sensing. Supporting Evidence: PMID:28099413 progeny phages measure the concentration of this peptide and lysogenize if the concentration is sufficiently high |
| GO:0005179 hormone activity | NAS | NEW | Summary: Added to align core_functions with existing annotations. Reason: Core function term not present in existing_annotations. |
| GO:0030414 peptidase inhibitor activity | NAS | NEW | Summary: Added to align core_functions with existing annotations. Reason: Core function term not present in existing_annotations. |
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Download this section (compressed HTML)Q: What determines the specificity of AimP peptides for their cognate AimR receptors across different phage species?
Suggested experts: Structural biologists studying peptide-protein interactions, Phage communication system researchers
Q: How does the arbitrium system integrate with bacterial host defense mechanisms like toxin-antitoxin systems?
Suggested experts: Bacterial defense system experts, Phage-host interaction researchers
Q: Can the arbitrium system be exploited for phage therapy applications to control lysis timing?
Suggested experts: Phage therapy researchers, Synthetic biology experts
Experiment: Crystallographic or NMR studies of AimP-AimR complex to understand binding interface and specificity determinants
Hypothesis: The AimP peptide adopts a specific conformation when bound to AimR that could be targeted for modulation
Type: Structure determination
Experiment: Design synthetic AimP peptides with altered activity or specificity to control phage lysis-lysogeny decisions
Hypothesis: Engineered AimP variants can be used to control phage behavior for therapeutic applications
Type: Synthetic biology
Experiment: Time-resolved measurements of AimP concentration correlated with phage/bacteria population dynamics under different infection conditions
Hypothesis: AimP concentration thresholds determine phage-bacteria population dynamics
Type: Population dynamics
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