GO:1901826 zeaxanthin catabolic process: Carotenoid Turnover, Genes, Functions and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:1901826 (zeaxanthin catabolic process) describes the chemical reactions and pathways that break down zeaxanthin, a xanthophyll carotenoid.
• Zeaxanthin is a macular pigment concentrated in the central fovea, where it protects against blue light and oxidative stress.
• Catabolism of zeaxanthin is part of carotenoid turnover and is linked to the xanthophyll cycle and nonphotochemical quenching in plants.
• Key enzymes include carotenoid cleavage dioxygenases (CCDs) and zeaxanthin epoxidase (ZEP), which generate apocarotenoid products.
• Dysregulation of zeaxanthin metabolism is associated with age-related macular degeneration and diabetic retinopathy.
• CRISPR knockout, knock-in, and overexpression models enable functional dissection of zeaxanthin catabolic genes in human and plant systems.
Description
Zeaxanthin is a dietary xanthophyll carotenoid that accumulates in the human macula and is critical for visual function and photoprotection. The Gene Ontology term GO:1901826, zeaxanthin catabolic process, defines the biochemical reactions and pathways that result in the breakdown of zeaxanthin. Understanding this catabolic process is essential because the balance between zeaxanthin synthesis, accumulation, and degradation influences retinal health and plant photoprotection. In humans, zeaxanthin and its isomer lutein are the only carotenoids concentrated in the macula, where they filter blue light and quench reactive oxygen species. In plants, zeaxanthin participates in the xanthophyll cycle and nonphotochemical quenching, and its catabolism contributes to the production of apocarotenoid signals. Research into zeaxanthin catabolism spans ophthalmology, nutrition, plant biology, and biotechnology, making GO:1901826 a valuable annotation for cross-disciplinary studies. This article synthesizes the current understanding of zeaxanthin catabolic process based on published literature and outlines how CRISPR-based models can be used to study its components.
zeaxanthin catabolic process At A Glance
| GO ID | GO:1901826 |
|---|---|
| GO term | zeaxanthin catabolic process |
| Ontology | biological_process |
| Synonym | zeaxanthin breakdown; zeaxanthin catabolism; zeaxanthin degradation |
| Definition | The chemical reactions and pathways resulting in the breakdown of zeaxanthin. |
| Major function | Turnover of zeaxanthin to apocarotenoids and other metabolites |
| Related process | Carotenoid catabolic process; xanthophyll cycle |
| Key enzymes | Carotenoid cleavage dioxygenases (CCDs), zeaxanthin epoxidase (ZEP) |
| Relevance | Retinal health, plant photoprotection, nutritional interventions |
What Is GO:1901826?
GO:1901826, zeaxanthin catabolic process, is defined as the chemical reactions and pathways resulting in the breakdown of zeaxanthin. It encompasses enzymatic and non-enzymatic steps that convert zeaxanthin into downstream metabolites, including apocarotenoids and other cleavage products. This process is part of the broader carotenoid catabolic process and is relevant to both plant and animal systems where zeaxanthin is present.
Why Is zeaxanthin catabolic process Important in Cell Biology?
Zeaxanthin catabolic process is important because it regulates the availability of zeaxanthin, a carotenoid with essential roles in vision and photoprotection. In the human retina, zeaxanthin and lutein protect against age-related macular degeneration and diabetic retinopathy by filtering blue light and reducing oxidative stress. In plants, zeaxanthin catabolism is linked to the xanthophyll cycle and nonphotochemical quenching, which are critical for dissipating excess light energy. Additionally, zeaxanthin breakdown products can serve as signaling molecules and precursors for biotechnologically valuable compounds. Therefore, understanding GO:1901826 has implications for nutrition, ophthalmology, agriculture, and biotechnology.
• Zeaxanthin is a macular pigment that protects the retina from blue light and oxidative damage.
• Catabolism of zeaxanthin affects its bioavailability and accumulation in tissues.
• Zeaxanthin supplementation reduces inflammatory cytokines and oxidative markers in humans.
• In plants, zeaxanthin catabolism is part of the xanthophyll cycle and nonphotochemical quenching.
• Carotenoid cleavage dioxygenases generate apocarotenoids with signaling and industrial value.
• Dysregulation of zeaxanthin metabolism is linked to age-related eye diseases.
• Diabetic retinopathy involves oxidative stress and inflammation that may be modulated by zeaxanthin.
• Zeaxanthin and lutein are studied for their anti-inflammatory and brain health effects.
• Biotechnological production of carotenoids relies on understanding their catabolic pathways.
• CRISPR models enable functional studies of zeaxanthin catabolic genes in various organisms.
What Happens During zeaxanthin catabolic process?
Initial oxidation and epoxidation
In simple terms: Zeaxanthin is first modified by enzymes that add oxygen atoms, preparing it for breakdown.
The catabolism of zeaxanthin often begins with enzymatic oxidation. In plants, zeaxanthin epoxidase (ZEP) converts zeaxanthin to antheraxanthin and then to violaxanthin, which is part of the xanthophyll cycle. This epoxidation is a reversible step that modulates the pool of zeaxanthin available for photoprotection. In non-plant systems, cytochrome P450 enzymes may catalyze similar oxidation reactions, although specific enzymes in humans are less characterized.
Carotenoid cleavage by dioxygenases
In simple terms: Enzymes called carotenoid cleavage dioxygenases cut zeaxanthin into smaller molecules.
Carotenoid cleavage dioxygenases (CCDs) cleave zeaxanthin at specific double bonds, producing apocarotenoids such as 3-hydroxy-beta-ionone and other derivatives. These enzymes are found in plants, bacteria, and animals, and they play key roles in generating signaling molecules and flavor compounds. The cleavage reaction requires molecular oxygen and often uses iron as a cofactor.
Formation of apocarotenoid products
In simple terms: The breakdown of zeaxanthin yields smaller compounds called apocarotenoids.
The products of zeaxanthin cleavage include a variety of apocarotenoids that can act as hormones, pigments, or aroma compounds. For example, in plants, cleavage of zeaxanthin can lead to the formation of abscisic acid precursors, although the exact pathways are complex. In animals, apocarotenoids derived from zeaxanthin may have biological activities, but their roles are still being investigated.
Further modification and conjugation
In simple terms: The initial breakdown products can be further modified to make them easier to excrete or reuse.
After cleavage, apocarotenoids may undergo additional modifications such as hydroxylation, glycosylation, or conjugation to sugars or fatty acids. These modifications increase water solubility and facilitate transport or storage. In plants, glycosylated apocarotenoids are common, while in animals, conjugation with glucuronic acid may occur to enhance excretion.
Regulation by light and oxidative stress
In simple terms: Light and stress conditions can speed up or slow down zeaxanthin breakdown.
In plants, the xanthophyll cycle is rapidly regulated by light intensity; high light induces zeaxanthin accumulation and subsequent epoxidation in low light. Oxidative stress can also promote non-enzymatic oxidation of zeaxanthin, leading to breakdown products. In humans, dietary and environmental factors may influence zeaxanthin catabolism, but the regulatory mechanisms are not fully understood.
Key Genes Involved in GO:1901826 zeaxanthin catabolic process
The following genes and proteins are involved in zeaxanthin catabolic process or related carotenoid metabolism, based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| ZEP | Zeaxanthin epoxidase; converts zeaxanthin to antheraxanthin and violaxanthin | Key enzyme in xanthophyll cycle; target for plant photoprotection studies |
| CCD1 | Carotenoid cleavage dioxygenase 1; cleaves zeaxanthin to apocarotenoids | Generates volatile compounds and signaling molecules |
| CCD4 | Carotenoid cleavage dioxygenase 4; involved in carotenoid turnover | Affects carotenoid accumulation in plants |
| CCD7 | Carotenoid cleavage dioxygenase 7; involved in strigolactone biosynthesis | Links zeaxanthin catabolism to plant hormone pathways |
| CCD8 | Carotenoid cleavage dioxygenase 8; involved in strigolactone biosynthesis | Similar to CCD7; affects plant architecture |
| BCO1 | Beta-carotene oxygenase 1; cleaves carotenoids including zeaxanthin | Produces retinal and apocarotenoids in animals |
| BCO2 | Beta-carotene oxygenase 2; cleaves xanthophylls | Important for zeaxanthin metabolism in mammals |
| CYP97A | Cytochrome P450 carotenoid hydroxylase | Modifies carotenoid structure in plants |
| CYP97B | Cytochrome P450 carotenoid hydroxylase | Similar to CYP97A; affects xanthophyll composition |
| NPQ1 | Nonphotochemical quenching 1; encodes violaxanthin de-epoxidase | Regulates zeaxanthin formation in plants |
| NPQ2 | Nonphotochemical quenching 2; encodes zeaxanthin epoxidase | Controls zeaxanthin levels in plants |
| ABI1 | Protein phosphatase 2C; involved in ABA signaling | Indirectly affects zeaxanthin catabolism via ABA |
| ABI2 | Protein phosphatase 2C; involved in ABA signaling | Similar to ABI1 |
| PSY | Phytoene synthase; first committed step in carotenoid biosynthesis | Upstream of zeaxanthin; affects substrate availability |
| PDS | Phytoene desaturase; carotenoid biosynthesis | Affects zeaxanthin precursor levels |
| ZDS | Zeta-carotene desaturase; carotenoid biosynthesis | Similar to PDS |
| CRTISO | Carotenoid isomerase; biosynthesis | Affects carotenoid composition |
| LCYB | Lycopene beta-cyclase; biosynthesis | Influences zeaxanthin production |
How Is zeaxanthin catabolic process Regulated?
Zeaxanthin catabolic process is regulated at multiple levels. In plants, the xanthophyll cycle is rapidly modulated by light intensity through the activities of violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZEP), which are regulated by pH and redox state. Carotenoid cleavage dioxygenases (CCDs) are transcriptionally regulated during development and in response to stress. In animals, dietary intake and absorption influence zeaxanthin levels, and enzymes such as BCO1 and BCO2 are regulated by transcription factors and microRNAs. However, specific regulatory mechanisms for zeaxanthin catabolism in humans remain an active area of research.
zeaxanthin catabolic process and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| BCO1 | Age-related macular degeneration; carotenoid metabolism | Knockout mouse or human retinal pigment epithelial cells |
| BCO2 | Macular pigment density; oxidative stress | Knockout zebrafish or cell lines |
| ZEP | Plant photoprotection; xanthophyll cycle | Arabidopsis knockout or overexpression lines |
| CCD1 | Apocarotenoid production; flavor and aroma | Tomato or petunia knockout lines |
| CCD4 | Carotenoid accumulation in crops | Rice or maize knockout lines |
Age-related macular degeneration (AMD)
Zeaxanthin and lutein are the primary macular pigments that protect the retina from oxidative damage and blue light. Reduced levels of these carotenoids are associated with increased risk of AMD. Catabolism of zeaxanthin may lower its availability, potentially contributing to AMD progression. Nutritional interventions with zeaxanthin have shown benefits in clinical studies.
Diabetic retinopathy
Diabetic retinopathy involves oxidative stress, inflammation, and MAPK pathway activation. Zeaxanthin and related macular pigments have protective effects against blue light-induced oxidative stress in retinal cells. Catabolism of zeaxanthin could modulate its protective capacity, although direct evidence is limited.
Inflammatory and cardiovascular conditions
Zeaxanthin supplementation has been shown to attenuate inflammatory cytokines and markers of oxidative cardiovascular processes in humans. This suggests that maintaining adequate zeaxanthin levels, potentially by modulating its catabolism, could have systemic anti-inflammatory benefits.
Plant stress and crop quality
In plants, zeaxanthin catabolism is integral to the xanthophyll cycle and nonphotochemical quenching, which protect against photoinhibition. Disruption of these pathways can affect plant fitness and crop yield. Understanding zeaxanthin catabolism is therefore relevant for agricultural biotechnology.
From zeaxanthin catabolic process-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of BCO2 affect zeaxanthin levels in retina? | BCO2 knockout mouse or human RPE cells |
| How does ZEP mutation alter xanthophyll cycle? | Arabidopsis ZEP knockout or point mutant |
| Can overexpression of CCD1 increase apocarotenoid production? | Transgenic tomato or yeast overexpression |
| What is the effect of zeaxanthin catabolism on inflammation? | Human macrophage cell line with CRISPR knockout of BCO1 |
| Does a tagged BCO1 knock-in reveal subcellular localization? | HEK293T cells with GFP-BCO1 knock-in |
| Which genes regulate zeaxanthin breakdown under stress? | CRISPR library screening in plant or human cells |
How to Study the zeaxanthin catabolic process Process
| Method | What It Measures | Typical Application |
|---|---|---|
| CRISPR knockout screen | Gene essentiality for zeaxanthin catabolism | Identify novel regulators in cell lines |
| RNA-seq | Transcript abundance | Expression profiling of CCDs and BCOs |
| Metabolomics (LC-MS) | Zeaxanthin and apocarotenoid levels | Quantify pathway flux |
| Western blot | Protein expression | Validate knockout or overexpression |
| Immunofluorescence | Subcellular localization | Determine organelle targeting |
| HPLC | Carotenoid quantification | Measure zeaxanthin in tissues |
| CRISPR knock-in | Tagged protein expression | Live-cell imaging of enzyme dynamics |
CRISPR-Cas9 knockout screens
CRISPR knockout screens can identify genes required for zeaxanthin catabolism. By transducing cells with a genome-wide sgRNA library and selecting for altered zeaxanthin levels or downstream phenotypes, researchers can uncover novel regulators. This approach is applicable to both plant and human cell models.
RNA sequencing (RNA-seq)
RNA-seq measures transcript levels of genes involved in zeaxanthin metabolism, such as CCDs and BCOs, under different conditions. It can reveal transcriptional regulation and splice variants.
Metabolomics and lipidomics
Mass spectrometry-based metabolomics quantifies zeaxanthin and its catabolic products, including apocarotenoids. This method provides direct biochemical evidence of pathway activity.
Imaging and localization studies
Fluorescence microscopy with tagged proteins (e.g., GFP-ZEP) can visualize subcellular localization of zeaxanthin catabolic enzymes. In human retina, autofluorescence imaging assesses macular pigment distribution.
How CRISPR Can Be Used to Study GO:1901826 zeaxanthin catabolic process
Knockout
CRISPR knockout of genes such as BCO1, BCO2, or CCDs can abolish zeaxanthin catabolism, leading to accumulation of zeaxanthin and reduced apocarotenoid products. This is useful for studying the consequences of blocked catabolism in retinal or plant cells.
Point Mutation
Introducing specific point mutations in catalytic residues of zeaxanthin catabolic enzymes can dissect their mechanism. For example, mutating iron-binding residues in CCDs can inactivate cleavage activity without affecting protein stability.
Knock-in
Knock-in of tagged versions (e.g., GFP or FLAG) of ZEP or BCO2 allows visualization and immunoprecipitation of these enzymes in their native context. This helps determine their subcellular localization and interaction partners.
Overexpression
Overexpression of zeaxanthin catabolic genes, such as CCD1, can increase production of apocarotenoids, which is valuable for biotechnology. In human cells, overexpression of BCO2 can enhance zeaxanthin breakdown and reduce its protective effects.
How EDITGENE Supports zeaxanthin catabolic process Research
Researchers studying zeaxanthin catabolic process-related genes often need to determine whether a candidate gene is causally involved in zeaxanthin breakdown, how mutations affect enzyme activity, and what the downstream consequences are for cellular function. EDITGENE provides a comprehensive suite of CRISPR services to address these questions, from knockout and point mutation to knock-in and overexpression, as well as library screening and bioinformatics support.
Contact EDITGENE today to design your custom CRISPR model for zeaxanthin catabolic process research.
Frequently Asked Questions About zeaxanthin catabolic process
What is zeaxanthin catabolic process?
Zeaxanthin catabolic process (GO:1901826) is the set of biochemical reactions that break down zeaxanthin into smaller molecules, such as apocarotenoids.
What genes are involved in zeaxanthin catabolic process?
Key genes include carotenoid cleavage dioxygenases (CCDs), zeaxanthin epoxidase (ZEP), and beta-carotene oxygenases (BCO1, BCO2).
Why is zeaxanthin catabolism important for eye health?
Zeaxanthin protects the retina from blue light and oxidative damage; its catabolism reduces its availability, potentially affecting age-related macular degeneration.
How is zeaxanthin catabolic process regulated in plants?
In plants, it is regulated by light via the xanthophyll cycle, involving ZEP and VDE, and by developmental and stress signals.
What are the products of zeaxanthin catabolism?
Products include apocarotenoids such as 3-hydroxy-beta-ionone, abscisic acid precursors, and other cleavage derivatives.
Can CRISPR be used to study zeaxanthin catabolic process?
Yes, CRISPR knockout, knock-in, and overexpression models allow functional dissection of genes involved in zeaxanthin catabolism.
What diseases are linked to zeaxanthin catabolism?
Age-related macular degeneration, diabetic retinopathy, and inflammatory conditions have been associated with altered zeaxanthin levels.
How can I measure zeaxanthin catabolic activity?
Methods include HPLC, mass spectrometry, RNA-seq, and CRISPR screens to quantify zeaxanthin and its metabolites.
What is the role of BCO2 in zeaxanthin catabolism?
BCO2 is a carotenoid cleavage enzyme that can break down zeaxanthin in mammals, affecting its accumulation.
Where can I get CRISPR models for zeaxanthin catabolic genes?
EDITGENE provides custom knockout, point mutation, knock-in, and overexpression models for zeaxanthin catabolic genes.
Conclusion
Zeaxanthin catabolic process (GO:1901826) is a critical biological process that regulates the availability of zeaxanthin, a carotenoid essential for vision and photoprotection. Understanding its mechanisms, from enzymatic cleavage by CCDs and BCOs to regulation by light and stress, has implications for ophthalmology, nutrition, and plant biotechnology. CRISPR-based models offer powerful tools to dissect these pathways and identify therapeutic targets. EDITGENE supports researchers with tailored CRISPR services to study zeaxanthin catabolism and related genes.
References
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