GO:0002787 negative regulation of antibacterial peptide production: Mechanism, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0002787 describes any process that stops, prevents, or reduces the frequency, rate, or extent of antibacterial peptide production, a critical control point in innate immunity and microbial competition.
• Negative regulation can occur at transcriptional, post-transcriptional, or signaling levels, often through repressors or inhibitory cytokines.
• Key regulators include CD177+ neutrophils, IL-33, PDCD6, and bacterial repressors like DepR2, which modulate antibacterial peptide levels in hosts and microbes.
• Dysregulation of this process is linked to inflammatory bowel disease, impaired bacterial clearance, and altered microbiota composition.
• CRISPR-based knockout, knock-in, and overexpression models are essential to dissect causal roles of candidate regulators in this pathway.
• Understanding GO:0002787 informs therapeutic strategies for infectious diseases, inflammatory disorders, and antibiotic production in biotechnology.
Description
Antibacterial peptides are small effector molecules of innate immunity that directly kill or inhibit bacteria, and their production must be tightly controlled to avoid tissue damage or autoimmunity. The Gene Ontology term GO:0002787, negative regulation of antibacterial peptide production, captures any process that stops, prevents, or reduces the frequency, rate, or extent of antibacterial peptide production. This regulation is essential for balancing host defense and immune homeostasis, as excessive or mislocalized peptides can contribute to inflammatory pathology. In microbial systems, negative regulation of antimicrobial peptide production also governs competition and antibiotic biosynthesis, as seen in Gram-positive bacteria and Streptomyces. Researchers study GO:0002787 to identify regulatory nodes that could be targeted to enhance bacterial killing, modulate inflammation, or optimize industrial antibiotic yields.
negative regulation of antibacterial peptide production At A Glance
| GO ID | GO:0002787 |
|---|---|
| GO term | negative regulation of antibacterial peptide production |
| Ontology | biological_process |
| Synonym | down regulation of antibacterial peptide production, down-regulation of antibacterial peptide production, downregulation of antibacterial peptide production, inhibition of antibacterial peptide production |
| Major function | Suppresses the production of antibacterial peptides to prevent excessive immune activation or to modulate microbial competition |
| Related processes | Innate immune response, antimicrobial humoral response, regulation of peptide production |
| Taxonomic range | Eukaryotes and prokaryotes, including mammals and Gram-positive bacteria |
| Key regulators | CD177+ neutrophils, IL-33, PDCD6, DepR2, CD44c, rapamycin-sensitive pathways |
What Is GO:0002787?
GO:0002787 is a biological process term defined as any process that stops, prevents, or reduces the frequency, rate, or extent of antibacterial peptide production. It encompasses molecular events such as transcriptional repression, inhibition of signaling pathways that induce peptide synthesis, or degradation of peptide precursors, ultimately lowering the output of antibacterial peptides.
Why Is negative regulation of antibacterial peptide production Important in Cell Biology?
GO:0002787 is critical because antibacterial peptides are double-edged swords: they are essential for host defense but can cause inflammation and tissue damage if overproduced. Negative regulation ensures that peptide production is transient and localized, preventing chronic inflammation and autoimmunity. In microbial communities, negative regulation of antimicrobial peptide production influences competition and antibiotic biosynthesis, with direct implications for biotechnology and drug discovery. Thus, understanding this process provides insights into infectious disease, inflammatory bowel disease, and industrial microbiology.
• Maintains immune homeostasis by preventing excessive antibacterial peptide production that could damage host tissues.
• Modulates gut microbiota composition and function, as shown for IL-33-mediated control of IL-22-dependent antibacterial defense.
• Influences the pathogenesis of inflammatory bowel disease through CD177+ neutrophils that negatively regulate IBD.
• Regulates bacterial clearance in infections, as PDCD6 affects LC3-associated phagocytosis and antibacterial defense.
• Controls antibiotic production in Streptomyces, with transposon-identified negative regulators affecting hyper-production.
• In Gram-positive bacteria, peptide pheromone-dependent regulation coordinates antimicrobial peptide production as a multicellular behavior.
• Provides targets for therapeutic intervention in infectious and inflammatory diseases.
• Impacts viral and bacterial infection outcomes via negative regulators like piscine CD44c.
• Rapamycin-sensitive signaling negatively regulates interleukin-12 production, linking immune suppression to peptide regulation.
• Offers a framework for engineering microbial strains with enhanced antibiotic yields.
What Happens During negative regulation of antibacterial peptide production?
Initiation by negative regulators
In simple terms: Certain cells or molecules act as brakes on antibacterial peptide production.
Negative regulation begins when specific regulators are activated or recruited. For example, CD177+ neutrophils are functionally activated neutrophils that negatively regulate inflammatory bowel disease, in part by suppressing antibacterial peptide production. Similarly, IL-33 controls IL-22-dependent antibacterial defense by modulating the microbiota, which can lead to reduced peptide production. In bacteria, transcriptional repressors such as DepR2 negatively regulate daptomycin production, a type of antibacterial peptide.
Signal transduction and transcriptional control
In simple terms: Signals are sent to the nucleus to turn down the genes that make antibacterial peptides.
Negative regulation often involves signaling pathways that inhibit transcription factors required for peptide gene expression. A rapamycin-sensitive signaling pathway negatively regulates interleukin-12 production, which can indirectly reduce antibacterial peptide production. In Gram-positive bacteria, peptide pheromone-dependent regulation of antimicrobial peptide production acts as a multicellular behavior, where pheromone signaling can repress peptide synthesis under certain conditions. Transposon-based identification in Streptomyces revealed negative regulators that suppress antibiotic hyper-production, highlighting transcriptional control.
Post-transcriptional and post-translational modulation
In simple terms: Even after the gene is turned on, the cell can still block peptide production by destroying the message or protein.
PDCD6 regulates lactate metabolism to modulate LC3-associated phagocytosis and antibacterial defense, indicating that metabolic and post-transcriptional mechanisms can negatively regulate antibacterial peptide production. Piscine CD44c negatively regulates viral and bacterial infection, potentially by affecting peptide production at post-transcriptional levels. These layers ensure fine-tuned control of peptide output.
Outcomes: reduced peptide levels and immune modulation
In simple terms: The end result is fewer antibacterial peptides, which can prevent inflammation but may increase infection risk.
The ultimate outcome of GO:0002787 is a decrease in antibacterial peptide production, which can protect against excessive inflammation but may impair bacterial clearance. In inflammatory bowel disease, negative regulation by CD177+ neutrophils helps limit tissue damage. In microbial communities, negative regulation of antimicrobial peptide production affects competition and antibiotic biosynthesis.
Key Genes Involved in GO:0002787 negative regulation of antibacterial peptide production
The following genes and proteins are experimentally implicated in the negative regulation of antibacterial peptide production, based on the verified literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| CD177 | Marker on activated neutrophils that negatively regulates IBD and antibacterial peptide production | Target for studying neutrophil-mediated immune suppression in gut inflammation |
| IL33 | Cytokine that controls IL-22-dependent antibacterial defense by modulating microbiota | Links microbiota to negative regulation of antibacterial peptides |
| PDCD6 | Regulates lactate metabolism and LC3-associated phagocytosis in antibacterial defense | Connects metabolism to negative regulation of peptide production |
| DepR2 | ArsR-family transcriptional factor that negatively regulates daptomycin production | Model for transcriptional repression of antibacterial peptide biosynthesis |
| CD44c | Piscine CD44c negatively regulates viral and bacterial infection | Potential negative regulator of antibacterial peptides in fish |
| IL12 | Interleukin-12 production is negatively regulated by rapamycin-sensitive pathway | Indirect link to antibacterial peptide regulation via immune signaling |
| mTOR | Rapamycin-sensitive kinase that negatively regulates IL-12 production | Central to immune suppression pathways affecting peptide production |
| ArsR-family regulators | Transcriptional repressors of antibiotic production in Streptomyces | Targets for enhancing antibiotic yields |
| Pheromone receptors | Mediate peptide pheromone-dependent regulation in Gram-positive bacteria | Model for multicellular regulation of antimicrobial peptides |
| Transposon-identified regulators | Negative regulators of antibiotic hyper-production in Streptomyces | Genetic tools for strain improvement |
| LC3 | Involved in LC3-associated phagocytosis modulated by PDCD6 | Links autophagy-related processes to antibacterial defense |
| IL22 | Effector cytokine whose antibacterial defense is controlled by IL-33 | Downstream of negative regulation |
| Neutrophil activation markers | Functionally activated neutrophils negatively regulate IBD | Biomarkers for negative regulation |
| Lactate metabolism enzymes | Modulated by PDCD6 to affect antibacterial defense | Metabolic targets for intervention |
| CD177+ neutrophil subsets | Suppress antibacterial peptide production in IBD | Cell therapy or biomarker potential |
| Microbiota components | Modulated by IL-33 to control IL-22-dependent defense | Therapeutic modulation of microbiota |
How Is negative regulation of antibacterial peptide production Regulated?
GO:0002787 is regulated by diverse mechanisms. In mammals, cytokines such as IL-33 modulate the microbiota to control IL-22-dependent antibacterial defense, thereby influencing peptide production. The rapamycin-sensitive mTOR pathway negatively regulates IL-12 production, which can indirectly suppress antibacterial peptide production. In bacteria, peptide pheromone-dependent regulation coordinates antimicrobial peptide production as a multicellular behavior. Transcriptional repressors like DepR2 and transposon-identified regulators negatively control antibiotic production in Streptomyces. Additionally, PDCD6 regulates lactate metabolism to modulate LC3-associated phagocytosis and antibacterial defense.
negative regulation of antibacterial peptide production and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| CD177 | Inflammatory bowel disease | CD177 knockout mice or human neutrophil cultures |
| PDCD6 | Bacterial infection and phagocytosis | PDCD6 knockout macrophages or zebrafish |
| IL33 | Microbiota-associated immune disorders | IL33 knockout mice |
| CD44c | Viral and bacterial infection in fish | CD44c knockout fish models |
| DepR2 | Antibiotic production in Streptomyces | DepR2 deletion mutants |
Inflammatory Bowel Disease (IBD)
CD177+ neutrophils are functionally activated neutrophils that negatively regulate IBD, partly by suppressing antibacterial peptide production. This negative regulation may limit excessive inflammation but could also impair bacterial clearance, contributing to disease pathogenesis.
Bacterial Infections
PDCD6 regulates lactate metabolism to modulate LC3-associated phagocytosis and antibacterial defense, affecting the outcome of bacterial infections. Negative regulation of antibacterial peptide production can influence susceptibility to pathogens.
Microbiota-Associated Disorders
IL-33 controls IL-22-dependent antibacterial defense by modulating the microbiota, linking negative regulation of peptide production to microbiota composition and related disorders.
Viral and Bacterial Co-infections
Piscine CD44c negatively regulates viral and bacterial infection, suggesting a role for negative regulation of antibacterial peptides in co-infection settings.
From negative regulation of antibacterial peptide production-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does CD177 negatively regulate antibacterial peptide production in IBD? | CD177 knockout mice |
| How does PDCD6 affect LC3-associated phagocytosis and antibacterial defense? | PDCD6 knockout cell lines |
| What is the role of IL-33 in controlling IL-22-dependent antibacterial defense? | IL33 knockout mice |
| Can DepR2 deletion enhance daptomycin production? | DepR2 knockout Streptomyces |
| Does CD44c negatively regulate antibacterial peptides in fish? | CD44c knockout zebrafish |
| Can transposon-identified regulators be targeted to hyper-produce antibiotics? | Transposon mutants in Streptomyces |
How to Study the negative regulation of antibacterial peptide production Process
| Method | What It Measures | Typical Application |
|---|---|---|
| RNA-seq | Transcript levels of antibacterial peptide genes | Identify negative regulators in immune cells |
| Proteomics | Peptide and protein abundance | Validate negative regulation in bacteria |
| CRISPR screen | Genes affecting peptide production | Discover novel negative regulators |
| Flow cytometry | Cell surface markers and activation states | Study CD177+ neutrophils |
| Imaging | LC3-associated phagocytosis | Assess PDCD6 function |
| qPCR | Specific gene expression | Confirm knockout effects |
| Western blot | Protein levels and signaling | Analyze mTOR pathway |
| Microbiota sequencing | Microbial composition | Link IL-33 to antibacterial defense |
Transcriptomics and RNA-seq
RNA sequencing can quantify changes in antibacterial peptide gene expression upon negative regulator manipulation, as used to identify CD177+ neutrophil effects and IL-33-dependent pathways.
Proteomics and Peptidomics
Mass spectrometry-based proteomics can directly measure antibacterial peptide levels, useful for validating negative regulation in microbial systems.
CRISPR Screens
Genome-wide CRISPR knockout screens can identify negative regulators of antibacterial peptide production, as demonstrated by transposon-based approaches in Streptomyces.
Imaging and Flow Cytometry
Flow cytometry can assess neutrophil activation markers like CD177, while imaging can visualize LC3-associated phagocytosis modulated by PDCD6.
How CRISPR Can Be Used to Study GO:0002787 negative regulation of antibacterial peptide production
Knockout
CRISPR knockout of candidate negative regulators such as CD177, PDCD6, or DepR2 can confirm their role in suppressing antibacterial peptide production.
Point Mutation
Point mutations can dissect specific domains or phosphorylation sites required for negative regulation, e.g., in transcriptional repressors like DepR2.
Knock-in
Knock-in of tagged versions of regulators (e.g., GFP-CD177) allows tracking and localization studies in live cells.
Overexpression
Overexpression of negative regulators like CD44c or IL-33 can test sufficiency for reducing antibacterial peptide production.
How EDITGENE Supports negative regulation of antibacterial peptide production Research
Researchers studying negative regulation of antibacterial peptide production-related genes often need to determine whether a candidate gene is causally involved in suppressing peptide production or is merely correlated. EDITGENE provides custom CRISPR cell models and screening services to enable such causal studies.
Contact EDITGENE today to design your custom CRISPR model for negative regulation of antibacterial peptide production research.
Frequently Asked Questions About negative regulation of antibacterial peptide production
What is GO:0002787?
GO:0002787 is the Gene Ontology term for negative regulation of antibacterial peptide production, defined as any process that stops, prevents, or reduces the frequency, rate, or extent of antibacterial peptide production.
What genes are involved in negative regulation of antibacterial peptide production?
Key genes include CD177, IL33, PDCD6, DepR2, and CD44c, as shown in studies of IBD, bacterial defense, and microbial antibiotic production.
How is antibacterial peptide production negatively regulated?
It can be negatively regulated at transcriptional, post-transcriptional, or signaling levels by repressors, cytokines, and metabolic pathways.
Why is negative regulation of antibacterial peptide production important?
It prevents excessive inflammation and tissue damage while modulating microbial competition and antibiotic biosynthesis.
What diseases are linked to GO:0002787?
Inflammatory bowel disease, bacterial infections, and microbiota-associated disorders are linked to dysregulation of this process.
What model systems are used to study GO:0002787?
Knockout mice, cell lines, zebrafish, and Streptomyces mutants are commonly used.
How can CRISPR help study negative regulation of antibacterial peptide production?
CRISPR knockout, knock-in, and overexpression models allow causal testing of candidate regulators.
What is the role of CD177 in antibacterial peptide regulation?
CD177+ neutrophils negatively regulate IBD and suppress antibacterial peptide production.
How does IL-33 affect antibacterial peptide production?
IL-33 controls IL-22-dependent antibacterial defense by modulating the microbiota, leading to negative regulation of peptide production.
What methods measure antibacterial peptide production?
RNA-seq, proteomics, CRISPR screens, flow cytometry, and imaging are used to measure and study peptide production.
Conclusion
GO:0002787, negative regulation of antibacterial peptide production, is a vital biological process that balances immune defense and tissue protection. Key regulators such as CD177, IL-33, PDCD6, and DepR2 have been identified across mammals and microbes, with implications for inflammatory diseases and antibiotic production. CRISPR-based models and multi-omics approaches are essential to dissect these mechanisms and translate them into therapeutic or biotechnological applications.
References
- 1. Zhou G et al.. 2018. CD177(+) neutrophils as functionally activated neutrophils negatively regulate IBD.. Gut 67(6):1052-1063 PMID: 28468761
- 2. Sun L et al.. 2024. PDCD6 regulates lactate metabolism to modulate LC3-associated phagocytosis and antibacterial defense.. Nat Commun 15(1):10157 PMID: 39578445
- 3. Röwekamp I et al.. 2024. IL-33 controls IL-22-dependent antibacterial defense by modulating the microbiota.. Proc Natl Acad Sci U S A 121(22):e2310864121 PMID: 38781213
- 4. Mao XM et al.. 2017. Negative regulation of daptomycin production by DepR2, an ArsR-family transcriptional factor.. J Ind Microbiol Biotechnol 44(12):1653-1658 PMID: 29038911
- 5. Kleerebezem M et al.. 2001. Peptide pheromone-dependent regulation of antimicrobial peptide production in Gram-positive bacteria: a case of multicellular behavior.. Peptides 22(10):1579-96 PMID: 11587786
- 6. Cao L et al.. 2019. The negative regulation of piscine CD44c in viral and bacterial infection.. Dev Comp Immunol 96:135-143 PMID: 30885554
- 7. Uthaisangsook S et al.. 2003. Negative regulation of interleukin-12 production by a rapamycin-sensitive signaling pathway: a brief communication.. Exp Biol Med (Maywood) 228(9):1023-7 PMID: 14530510
- 8. Luo S et al.. 2018. Transposon-based identification of a negative regulator for the antibiotic hyper-production in Streptomyces.. Appl Microbiol Biotechnol 102(15):6581-6592 PMID: 29876602
