GO:0016098 monoterpenoid metabolic process: Biosynthesis, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0016098 monoterpenoid metabolic process describes all chemical reactions and pathways involving monoterpenoids, terpenoids with a C10 skeleton.
• Monoterpenoid metabolism is best studied in plants such as Pelargonium graveolens, where distinct metabolic pathways drive the biosynthesis of these volatile compounds.
• Anaerobic bacteria can degrade monoterpenes using bifunctional enzymes like linalool dehydratase-isomerase, revealing microbial monoterpenoid metabolism.
• Monoterpenoids such as perillyl alcohol and its metabolite perillic acid are of pharmacological interest and can be measured in plasma and lung tissue.
• Pulegone, a monoterpenoid ketone, can cause hepatotoxicity through covalent binding to microsomal proteins, linking monoterpenoid metabolism to toxicology.
• Biocatalysts are being developed to produce high-value monoterpenoid-derived compounds, highlighting industrial applications.
Description
Monoterpenoids are a diverse class of natural products built from two isoprene units, giving them a characteristic C10 skeleton. The Gene Ontology term GO:0016098, monoterpenoid metabolic process, encompasses the chemical reactions and pathways that synthesize, modify, and degrade these compounds. These processes are central to plant volatile production, microbial degradation, and the pharmacological activation or detoxification of monoterpenoid-based drugs. Understanding monoterpenoid metabolism is therefore relevant to plant biology, microbiology, pharmacology, and toxicology. For researchers, GO:0016098 provides a standardized framework to annotate genes and pathways involved in monoterpenoid biosynthesis and breakdown. Recent studies have elucidated distinct metabolic routes in Pelargonium graveolens and identified key enzymes such as linalool dehydratase-isomerase in anaerobic bacteria. Moreover, monoterpenoids like perillyl alcohol and pulegone have been investigated for their therapeutic potential and toxicity, underscoring the biomedical importance of this metabolic process.
monoterpenoid metabolic process At A Glance
| GO ID | GO:0016098 |
|---|---|
| GO term | monoterpenoid metabolic process |
| Ontology | biological_process |
| Synonym | monoterpenoid metabolism |
| Definition | The chemical reactions and pathways involving monoterpenoid compounds, terpenoids having a C10 skeleton. |
| Major function | Biosynthesis, modification, and degradation of C10 terpenoids |
| Related enzymes | Linalool dehydratase-isomerase, cytochrome P450s, terpene synthases |
| Taxonomic range | Plants, bacteria, fungi, and animals |
What Is GO:0016098?
GO:0016098, monoterpenoid metabolic process, is defined as the chemical reactions and pathways involving monoterpenoid compounds, which are terpenoids having a C10 skeleton. This biological process includes the biosynthesis, modification, and degradation of monoterpenoids, such as linalool, perillyl alcohol, and pulegone.
Why Is monoterpenoid metabolic process Important in Cell Biology?
Monoterpenoid metabolic process is important because monoterpenoids serve as volatile signaling molecules, antimicrobial agents, and precursors for pharmaceuticals and fragrances. Disruptions in this pathway can lead to altered plant defense, microbial degradation of environmental terpenes, and drug-induced toxicity such as pulegone-mediated hepatotoxicity. Additionally, monoterpenoids like perillyl alcohol are investigated for cancer therapy, making their metabolism a key determinant of efficacy and safety.
• Monoterpenoids are key components of essential oils and plant volatiles, affecting ecological interactions.
• Microbial monoterpenoid degradation contributes to the global carbon cycle and bioremediation.
• The pathway is involved in the bioactivation or detoxification of monoterpenoid drugs and toxins.
• Perillyl alcohol and its metabolite perillic acid are studied for lung cancer therapy, requiring knowledge of their metabolic fate.
• Biocatalyst development for high-value monoterpenoid compounds relies on understanding these metabolic steps.
• Monoterpenoid metabolism can influence foot odor through microbial conversion of terpenoids.
• Paeoniflorin, a monoterpenoid glycoside, protects hepatocytes via autophagy, linking monoterpenoid metabolism to cell survival.
• Programmable meroterpene synthesis demonstrates the potential to engineer monoterpenoid pathways for novel compounds.
What Happens During monoterpenoid metabolic process?
Biosynthesis of monoterpenoid precursors
In simple terms: Plants and microbes build the basic C10 building blocks of monoterpenoids.
Monoterpenoid biosynthesis begins with the generation of geranyl diphosphate (GPP), a C10 precursor formed by the condensation of isopentenyl diphosphate (IPP) and dimethylallyl diphosphate (DMAPP). In Pelargonium graveolens, distinct metabolic pathways drive the production of monoterpenoids such as citronellol and geraniol, with specialized enzymes catalyzing the formation of these volatile compounds. Terpene synthases then convert GPP into various monoterpene skeletons, which can be further modified by cytochrome P450s and other tailoring enzymes.
Enzymatic conversion and functionalization
In simple terms: Enzymes modify the basic monoterpene structures to create diverse compounds.
After the initial synthesis, monoterpenes undergo functionalization reactions, including hydroxylation, oxidation, and glycosylation. For example, linalool dehydratase-isomerase from anaerobic bacteria catalyzes the reversible dehydration and isomerization of linalool, a monoterpene alcohol, as part of its degradation pathway. In plants, cytochrome P450 enzymes often add hydroxyl groups to monoterpenes, increasing their solubility and reactivity. These modifications are crucial for the biological activity and volatility of monoterpenoids.
Degradation and catabolism
In simple terms: Microbes and other organisms break down monoterpenoids to use them as energy sources.
Monoterpenoid degradation is well studied in anaerobic bacteria, where linalool dehydratase-isomerase initiates the breakdown of linalool by converting it to geraniol or other intermediates. This enzyme is bifunctional, catalyzing both dehydration and isomerization, and is a key step in the anaerobic degradation of monoterpenes. Such catabolic pathways allow microorganisms to utilize monoterpenes as carbon and energy sources, contributing to the biogeochemical cycling of terpenes.
Metabolic fate of monoterpenoid drugs and toxins
In simple terms: The body processes monoterpenoid compounds, which can affect their safety and effectiveness.
In mammals, monoterpenoids such as perillyl alcohol are metabolized to perillic acid, which can be measured in plasma and lung tissue after inhalation. Pulegone, a monoterpenoid ketone found in pennyroyal oil, is metabolized by cytochrome P450 enzymes to reactive intermediates that covalently bind to microsomal proteins, leading to hepatotoxicity. These examples illustrate how monoterpenoid metabolic process determines the pharmacokinetics and toxicity of monoterpenoid-based compounds.
Engineering and biocatalysis
In simple terms: Scientists are harnessing enzymes from monoterpenoid pathways to make valuable products.
Recent advances in biocatalysis have focused on developing enzymes for the production of high-value-added compounds from monoterpenoids. Additionally, programmable meroterpene synthesis has been achieved by engineering biosynthetic pathways, demonstrating the potential to create novel meroterpenoids with diverse structures. These efforts rely on a deep understanding of monoterpenoid metabolic process and its enzymes.
Key Genes Involved in GO:0016098 monoterpenoid metabolic process
The following genes and enzymes are key players in monoterpenoid metabolic process, as supported by published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| Linalool dehydratase-isomerase | Bifunctional enzyme in anaerobic monoterpene degradation | Model for bacterial monoterpenoid catabolism |
| Terpene synthases (e.g., in Pelargonium graveolens) | Catalyze formation of monoterpene skeletons from GPP | Key for plant volatile biosynthesis |
| Cytochrome P450s | Oxidative functionalization of monoterpenes | Determine monoterpenoid diversity and drug metabolism |
| Perillyl alcohol metabolizing enzymes | Convert perillyl alcohol to perillic acid | Pharmacokinetic studies in lung |
| Pulegone metabolizing enzymes | Bioactivate pulegone to reactive intermediates | Hepatotoxicity model |
| Paeoniflorin-related enzymes | Metabolism of monoterpenoid glycoside | Hepatoprotective autophagy |
| Meroterpene synthases | Programmable synthesis of meroterpenoids | Engineered biosynthesis |
| Biocatalysts for monoterpenoid conversion | Production of high-value compounds | Industrial biotechnology |
| Microbial monoterpene degraders | Breakdown of monoterpenes in environment | Foot odor and bioremediation |
| Geranyl diphosphate synthase | Produces C10 precursor GPP | Central to monoterpenoid biosynthesis |
| Linalool synthase | Converts GPP to linalool | Aroma compound production |
| Geraniol synthase | Converts GPP to geraniol | Plant volatile |
| Citronellol synthase | Converts GPP to citronellol | Essential oil component |
| Monoterpene reductases | Reduce monoterpene double bonds | Modify volatility and activity |
| Monoterpene oxidases | Oxidize monoterpenes | Degradation and functionalization |
| Monoterpene glycosyltransferases | Glycosylate monoterpenoids | Solubility and storage |
| Monoterpene isomerases | Isomerize monoterpenes | Structural diversity |
| Monoterpene hydratases | Add water to monoterpenes | Degradation pathways |
How Is monoterpenoid metabolic process Regulated?
Monoterpenoid metabolic process is regulated at multiple levels. In plants, the expression of terpene synthase genes is often induced by developmental cues and environmental stresses, leading to altered volatile emission. In bacteria, the linalool dehydratase-isomerase gene is induced under anaerobic conditions when linalool is available as a substrate. In mammals, cytochrome P450 enzymes that metabolize monoterpenoids like pulegone can be induced or inhibited by xenobiotics, affecting toxicity. Additionally, the autophagy pathway modulated by paeoniflorin suggests that monoterpenoid glycosides can influence cellular stress responses. However, specific regulatory mechanisms for many monoterpenoid metabolic enzymes remain to be fully elucidated.
monoterpenoid metabolic process and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| CYP450 enzymes | Pulegone-induced hepatotoxicity | Liver-specific KO or humanized mouse |
| Perillyl alcohol metabolizing enzymes | Lung cancer therapy | Xenograft model with metabolite measurement |
| Paeoniflorin targets | APAP-induced liver injury | Autophagy reporter mice |
| Linalool dehydratase-isomerase | Anaerobic monoterpene degradation | Bacterial KO and complementation |
| Terpene synthases | Plant volatile production | Plant overexpression or CRISPR KO |
Monoterpenoid metabolism and hepatotoxicity
Pulegone, a monoterpenoid ketone, is metabolized by cytochrome P450 enzymes to reactive metabolites that covalently bind to microsomal proteins, leading to hepatotoxicity. This highlights the importance of monoterpenoid metabolic process in toxicology and drug safety.
Monoterpenoids in cancer therapy
Perillyl alcohol, a monoterpenoid, is investigated for lung cancer therapy, and its metabolism to perillic acid is a key pharmacokinetic parameter. Understanding monoterpenoid metabolic process can optimize dosing and efficacy.
Monoterpenoid glycosides and autophagy
Paeoniflorin, a monoterpenoid glycoside, protects hepatocytes from APAP-induced damage by launching autophagy via the MAPK/mTOR signaling pathway. This links monoterpenoid metabolism to cell survival mechanisms.
Microbial monoterpenoid metabolism and odor
Microbial metabolism of monoterpenoids contributes to foot odor, as bacteria convert terpenoids to volatile fatty acids. This illustrates the role of monoterpenoid metabolic process in human microbiome interactions.
From monoterpenoid metabolic process-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does gene X regulate monoterpenoid biosynthesis? | CRISPR knockout in Pelargonium graveolens or model plant |
| What is the role of a specific enzyme in monoterpene degradation? | Bacterial knockout of linalool dehydratase-isomerase |
| Can a point mutation alter substrate specificity? | Knock-in of mutant allele in cell line |
| How does overexpression affect monoterpenoid yield? | Overexpression of terpene synthase in plant or microbial host |
| What is the metabolic fate of a monoterpenoid drug? | Tagged knock-in of metabolizing enzyme for imaging |
| Does a monoterpenoid modulate autophagy? | Knockout of autophagy genes in hepatocytes |
How to Study the monoterpenoid metabolic process Process
| Method | What It Measures | Typical Application |
|---|---|---|
| LC-MS/MS | Quantification of monoterpenoids and metabolites | Pharmacokinetic studies |
| GC-MS | Volatile monoterpenoid profiling | Plant essential oil analysis |
| Enzyme kinetics | Catalytic activity and substrate specificity | Characterization of linalool dehydratase-isomerase |
| RNA-seq | Gene expression changes | Pathway discovery in Pelargonium |
| CRISPR knockout | Loss-of-function phenotypes | Gene function in monoterpenoid biosynthesis |
| CRISPR knock-in | Tagged or mutant protein expression | Imaging and localization |
| Overexpression | Gain-of-function effects | Enhanced monoterpenoid production |
| Autophagy flux assays | Autophagic activity | Paeoniflorin mechanism |
Metabolomics and analytical chemistry
Metabolomic profiling using GC-MS or LC-MS is essential to identify and quantify monoterpenoids and their metabolites. For example, simultaneous measurement of perillyl alcohol and perillic acid in plasma and lung tissue was achieved using a validated LC-MS/MS method. Such approaches allow researchers to track metabolic flux through the monoterpenoid metabolic process.
Enzyme assays and kinetics
In vitro enzyme assays with purified recombinant proteins, such as linalool dehydratase-isomerase, are used to determine catalytic mechanisms, substrate specificity, and kinetic parameters. These assays can be coupled with site-directed mutagenesis to probe active site residues.
Transcriptomics and gene expression analysis
RNA-seq and qRT-PCR are used to measure expression of genes involved in monoterpenoid metabolism under different conditions. In Pelargonium graveolens, transcriptomic analysis revealed distinct metabolic pathways driving monoterpenoid biosynthesis in a natural population.
CRISPR-based genome editing
CRISPR/Cas9 knockout, knock-in, and point mutation models are powerful tools to study gene function in monoterpenoid metabolic process. For example, knocking out a terpene synthase gene can reveal its contribution to volatile production. Overexpression of biosynthetic enzymes can enhance monoterpenoid yields.
How CRISPR Can Be Used to Study GO:0016098 monoterpenoid metabolic process
Knockout
CRISPR knockout of genes involved in monoterpenoid metabolic process, such as terpene synthases or cytochrome P450s, can reveal their essential roles in biosynthesis or degradation. For example, knocking out a linalool dehydratase-isomerase gene in anaerobic bacteria would abolish linalool degradation. In plants, knockout of a terpene synthase can reduce volatile emission.
Point Mutation
Introducing point mutations in catalytic residues of monoterpenoid enzymes can dissect their mechanism. For instance, mutating the active site of linalool dehydratase-isomerase could separate its dehydration and isomerization activities. Such models are valuable for understanding structure-function relationships.
Knock-in
Knock-in of tagged or reporter genes allows visualization and tracking of monoterpenoid enzymes in live cells. For example, knocking in a fluorescent tag on a perillyl alcohol metabolizing enzyme could monitor its localization and dynamics. This approach is useful for studying enzyme trafficking and interactions.
Overexpression
Overexpression of monoterpenoid biosynthetic genes can boost production of valuable compounds. For instance, overexpressing a terpene synthase in a microbial host can increase monoterpenoid yield. This strategy is widely used in metabolic engineering and synthetic biology.
How EDITGENE Supports monoterpenoid metabolic process Research
Researchers studying monoterpenoid metabolic process-related genes often need to determine whether a candidate gene is causally involved in the biosynthesis, modification, or degradation of monoterpenoids. EDITGENE provides comprehensive CRISPR services to accelerate this research.
Contact EDITGENE today to design your custom CRISPR model for monoterpenoid metabolic process research.
Frequently Asked Questions About monoterpenoid metabolic process
What is GO:0016098?
GO:0016098 is the Gene Ontology term for monoterpenoid metabolic process, defined as the chemical reactions and pathways involving monoterpenoid compounds, terpenoids having a C10 skeleton.
What are monoterpenoids?
Monoterpenoids are a class of terpenoids with a C10 skeleton, derived from two isoprene units. They include compounds like linalool, perillyl alcohol, and pulegone.
What genes are involved in monoterpenoid metabolic process?
Key genes include terpene synthases, cytochrome P450s, linalool dehydratase-isomerase, and enzymes metabolizing perillyl alcohol and pulegone.
How is monoterpenoid metabolic process studied?
It is studied using metabolomics, enzyme assays, transcriptomics, and CRISPR genome editing in model organisms and cell lines.
Why is monoterpenoid metabolism important for human health?
It affects drug metabolism and toxicity, as seen with pulegone-induced hepatotoxicity and perillyl alcohol pharmacokinetics.
Can monoterpenoids be used in cancer therapy?
Yes, perillyl alcohol is investigated for lung cancer therapy, and its metabolism to perillic acid is a key factor.
What is the role of linalool dehydratase-isomerase?
It is a bifunctional enzyme that catalyzes the dehydration and isomerization of linalool in anaerobic monoterpene degradation.
How does paeoniflorin relate to monoterpenoid metabolism?
Paeoniflorin is a monoterpenoid glycoside that protects hepatocytes via autophagy, linking monoterpenoid metabolism to cell survival.
What model organisms are used to study monoterpenoid metabolism?
Pelargonium graveolens is used for plant monoterpenoid biosynthesis, and anaerobic bacteria for degradation.
How can CRISPR help study monoterpenoid metabolic process?
CRISPR knockout, knock-in, point mutation, and overexpression models allow precise manipulation of genes to dissect their roles in monoterpenoid metabolism.
Conclusion
Monoterpenoid metabolic process (GO:0016098) is a fundamental biological process with wide-ranging implications in plant biology, microbiology, pharmacology, and toxicology. Understanding the enzymes and pathways involved can lead to improved drug safety, novel therapeutics, and sustainable production of valuable compounds. Continued research using advanced CRISPR tools and multi-omics approaches will further illuminate this dynamic metabolic landscape.
References
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- 4. Shen X et al.. 2020. Programmable meroterpene synthesis.. Nat Commun 11(1):508 PMID: 31980637
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