GO:1902271 D3 vitamins binding: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:1902271 (D3 vitamins binding) is a molecular_function term defined as binding to D3 vitamins, which includes cholecalciferol (vitamin D3) and its metabolites.
• D3 vitamins binding is mediated by proteins such as the vitamin D receptor (VDR), vitamin D binding protein (DBP/GC), and cytochrome P450 enzymes like CYP2R1 and CYP27B1.
• The binding of D3 vitamins to VDR triggers a conformational change that enables heterodimerization with RXR and transcriptional regulation of target genes involved in calcium homeostasis, immunity, and cell differentiation.
• D3 vitamins binding is critical for bone health, calcium metabolism, and has been implicated in chronic liver diseases, follicle development, and neurotoxicity.
• Research on D3 vitamins binding employs methods such as radioligand binding assays, surface plasmon resonance, and CRISPR-based gene editing to dissect binding specificity and downstream effects.
• Understanding D3 vitamins binding at the molecular level informs therapeutic strategies for vitamin D deficiency, metabolic bone diseases, and cancers.
Description
GO:1902271, D3 vitamins binding, is a molecular function term that describes the binding of proteins or other molecules to D3 vitamins, primarily cholecalciferol and its hydroxylated metabolites. This binding event is fundamental to vitamin D biology, as it initiates signaling cascades that regulate calcium and phosphate homeostasis, bone remodeling, immune function, and cell proliferation. The term encompasses interactions with the vitamin D receptor (VDR), a nuclear receptor that mediates most genomic actions of vitamin D3, as well as with carrier proteins like vitamin D binding protein (DBP) and enzymes involved in vitamin D metabolism. Researchers study D3 vitamins binding to understand how vitamin D3 exerts its pleiotropic effects and to develop therapies for conditions ranging from osteoporosis to chronic liver disease. The binding specificity and affinity of D3 vitamins to their protein partners are critical determinants of biological outcomes, making this GO term a focal point for structural and functional studies.
D3 vitamins binding At A Glance
| GO ID | GO:1902271 |
|---|---|
| GO term | D3 vitamins binding |
| Ontology | molecular_function |
| Synonym | None |
| Definition | Binding to D3 vitamins. |
| Major function | Mediates the interaction of proteins with vitamin D3 and its metabolites, initiating signaling and metabolic pathways. |
| Related proteins | VDR, DBP (GC), CYP2R1, CYP27B1, CYP24A1 |
| Associated processes | Calcium homeostasis, bone mineralization, immune regulation, cell differentiation |
| Disease relevance | Chronic liver diseases, bone disorders, vitamin D deficiency, certain cancers |
What Is GO:1902271?
According to the Gene Ontology, GO:1902271 D3 vitamins binding is defined as the binding to D3 vitamins. This molecular function encompasses the selective interaction of a protein or biomolecule with vitamin D3 (cholecalciferol) or its derivatives, such as 25-hydroxyvitamin D3 and 1,25-dihydroxyvitamin D3. The term does not specify the identity of the binding partner but includes any molecular event where a D3 vitamin is recognized and bound, whether by a receptor, enzyme, or transport protein.
Why Is D3 vitamins binding Important in Cell Biology?
D3 vitamins binding is essential for the biological activity of vitamin D3, a secosteroid hormone that regulates a wide array of physiological processes. The binding of vitamin D3 to the vitamin D receptor (VDR) is the first step in a signaling cascade that controls the expression of hundreds of genes involved in calcium absorption, bone formation, immune responses, and cell cycle regulation. Dysregulation of D3 vitamins binding has been linked to chronic liver diseases, where altered levels of vitamin D binding protein affect vitamin D bioavailability and function. Additionally, vitamin D3 binding influences follicle development in the ovary, highlighting its role in reproductive biology. Understanding the molecular details of D3 vitamins binding is therefore crucial for developing targeted therapies for vitamin D-related disorders and for interpreting the effects of vitamin D supplementation.
• D3 vitamins binding initiates genomic and non-genomic actions of vitamin D3, affecting calcium and phosphate homeostasis.
• It is critical for bone health, as vitamin D3 binding to VDR regulates osteoblast and osteoclast activity.
• Altered D3 vitamins binding is observed in chronic liver diseases, impacting vitamin D metabolism and signaling.
• Vitamin D3 binding plays a role in follicle development and reproductive processes.
• Excessive or dysregulated vitamin D3 binding can contribute to neurotoxicity, as seen in vitamin neurotoxicity studies.
• D3 vitamins binding is a target for nutrigenomic studies aiming to personalize vitamin D recommendations.
• It is involved in immune modulation, with VDR binding affecting cytokine production and immune cell differentiation.
• Binding of D3 vitamins to DBP influences their transport and bioavailability in circulation.
• Research on D3 vitamins binding informs the development of vitamin D analogs for therapeutic use.
• CRISPR-based models of genes involved in D3 vitamins binding enable causal studies of vitamin D function.
Molecular Mechanism of D3 vitamins binding
Ligand recognition and binding pocket
In simple terms: The protein has a pocket that fits vitamin D3 like a lock and key.
D3 vitamins binding typically occurs in a hydrophobic ligand-binding pocket of the target protein. For the vitamin D receptor (VDR), the pocket is formed by a bundle of alpha-helices that accommodate the secosteroid structure of 1,25-dihydroxyvitamin D3, the active form of vitamin D3. The binding is stabilized by hydrogen bonds and hydrophobic interactions, leading to a conformational change in VDR that releases corepressors and recruits coactivators. Other proteins, such as vitamin D binding protein (DBP), also bind vitamin D3 and its metabolites with high affinity, serving as transporters in the bloodstream.
Conformational change and cofactor recruitment
In simple terms: When vitamin D3 binds, the protein changes shape and calls in partner proteins.
Upon binding of D3 vitamins, VDR undergoes a conformational shift that exposes surfaces for heterodimerization with the retinoid X receptor (RXR). This heterodimer then binds to vitamin D response elements (VDREs) in the DNA, recruiting coactivator complexes that modify chromatin and activate transcription of target genes. The binding of D3 vitamins is thus a trigger for a cascade of protein-protein interactions that convert a chemical signal into a genomic response.
Enzymatic activation and metabolism
In simple terms: Enzymes modify vitamin D3 to make it active or inactive.
D3 vitamins binding also involves enzymes that metabolize vitamin D3. CYP2R1 and CYP27B1 bind vitamin D3 and its precursors to catalyze hydroxylation reactions, producing 25-hydroxyvitamin D3 and 1,25-dihydroxyvitamin D3, respectively. Conversely, CYP24A1 binds these metabolites to initiate their degradation. The binding affinities of these enzymes for D3 vitamins determine the balance between activation and inactivation, which is critical for maintaining vitamin D homeostasis.
Regulation of binding affinity and specificity
In simple terms: The strength and selectivity of binding can be tuned by the cell.
The binding of D3 vitamins to VDR and other proteins can be modulated by post-translational modifications, such as phosphorylation, and by the presence of cofactors like magnesium and calcium. Additionally, the expression levels of binding proteins are regulated by physiological cues, including calcium status and immune signals. Nutrigenomic studies have shown that genetic variations in genes encoding D3 vitamins binding proteins can alter binding affinity and downstream effects, influencing individual responses to vitamin D.
Key Genes Involved in GO:1902271 D3 vitamins binding
The following genes encode proteins that directly bind D3 vitamins or are critically involved in D3 vitamins binding-dependent pathways.
| Gene | Major Role | Research Relevance |
|---|---|---|
| VDR | Nuclear receptor that binds 1,25-dihydroxyvitamin D3 and mediates genomic actions | Central to vitamin D signaling; target for knockout and knock-in studies |
| GC | Vitamin D binding protein (DBP) that transports vitamin D metabolites in blood | Affects bioavailability; linked to chronic liver diseases |
| CYP2R1 | Cytochrome P450 enzyme that 25-hydroxylates vitamin D3 | Determines circulating 25(OH)D levels; genetic variants affect vitamin D status |
| CYP27B1 | Cytochrome P450 enzyme that 1α-hydroxylates 25(OH)D3 to active form | Critical for activation; mutations cause vitamin D-dependent rickets |
| CYP24A1 | Cytochrome P450 enzyme that catabolizes 1,25(OH)2D3 | Regulates vitamin D inactivation; target for overexpression studies |
| RXRA | Retinoid X receptor alpha, heterodimer partner of VDR | Essential for VDR-mediated transcription; knockout models reveal developmental roles |
| NCOA1 | Nuclear receptor coactivator 1, enhances VDR transcriptional activity | Modulates vitamin D response; relevant for cancer and metabolism |
| NCOR1 | Nuclear receptor corepressor 1, represses VDR in absence of ligand | Regulates basal repression; knockout affects vitamin D sensitivity |
| MED1 | Mediator complex subunit 1, bridges VDR to RNA polymerase II | Required for efficient transcription of vitamin D target genes |
| EP300 | Histone acetyltransferase p300, coactivator for VDR | Epigenetic regulation of vitamin D signaling |
| CREBBP | CREB-binding protein, coactivator with acetyltransferase activity | Interacts with VDR; involved in chromatin remodeling |
| SMARCA4 | SWI/SNF chromatin remodeler, facilitates VDR binding to chromatin | Impacts vitamin D target gene accessibility |
| KDM6B | Histone demethylase, removes repressive marks at VDR targets | Epigenetic modulator of vitamin D response |
| TRPV6 | Calcium channel upregulated by VDR, mediates calcium absorption | Functional readout of D3 vitamins binding in intestine |
| S100G | Calbindin-D9k, calcium-binding protein induced by vitamin D | Marker of vitamin D action in intestine and kidney |
| BGLAP | Osteocalcin, bone protein regulated by vitamin D | Biomarker of bone formation and vitamin D status |
| FGF23 | Fibroblast growth factor 23, regulates phosphate and vitamin D metabolism | Feedback regulator of D3 vitamins binding pathways |
| PTH | Parathyroid hormone, regulates vitamin D activation | Interconnected with D3 vitamins binding in calcium homeostasis |
How Is D3 vitamins binding Regulated?
D3 vitamins binding is regulated at multiple levels. The expression of VDR and vitamin D-metabolizing enzymes is controlled by hormones such as parathyroid hormone (PTH) and fibroblast growth factor 23 (FGF23), which respond to calcium and phosphate levels. Additionally, the binding affinity of VDR for D3 vitamins can be modulated by post-translational modifications and by interactions with cofactors. Nutrigenomic factors, including genetic polymorphisms in VDR and CYP2R1, influence binding efficiency and downstream effects. In chronic liver diseases, altered levels of vitamin D binding protein (DBP) affect the transport and availability of D3 vitamins for binding to target tissues.
D3 vitamins binding and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| VDR | Vitamin D-dependent rickets, osteoporosis, cancer | VDR knockout mice; point mutation knock-in for ligand-binding domain |
| GC | Chronic liver disease, vitamin D deficiency | GC knockout mice; overexpression in hepatocytes |
| CYP27B1 | Vitamin D-dependent rickets type I | CYP27B1 knockout mice; knock-in of patient mutations |
| CYP24A1 | Idiopathic infantile hypercalcemia | CYP24A1 knockout mice; overexpression in kidney cells |
| VDR | Follicle development disorders | Ovary-specific VDR knockout mice |
Chronic liver diseases
Chronic liver diseases are associated with reduced levels of vitamin D binding protein (DBP), which impairs the transport of D3 vitamins and leads to vitamin D deficiency. This deficiency exacerbates liver fibrosis and inflammation, creating a vicious cycle. Studies have shown that DBP levels correlate with disease severity, and restoring D3 vitamins binding may improve outcomes.
Bone disorders and calcium metabolism
Defects in D3 vitamins binding, particularly mutations in VDR or CYP27B1, cause rare bone disorders such as vitamin D-dependent rickets. Inadequate binding leads to impaired calcium absorption and bone mineralization. Vitamin D3 binding to VDR is also essential for osteoblast differentiation and bone formation, making it a target for osteoporosis therapies.
Neurotoxicity
Excessive vitamin D3 binding or dysregulated signaling can contribute to neurotoxicity, as observed in vitamin neurotoxicity studies. While vitamin D is generally neuroprotective, hypervitaminosis D may lead to hypercalcemia and neurological symptoms. Understanding the binding kinetics of D3 vitamins in the nervous system is important for safety assessments.
Reproductive biology and follicle development
Vitamin D3 binding plays a role in follicle development in the ovary, where VDR is expressed in granulosa cells. Dysregulation of D3 vitamins binding has been linked to polycystic ovary syndrome and infertility. Research in animal models suggests that vitamin D3 supplementation can improve follicular health through VDR-mediated mechanisms.
From D3 vitamins binding-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does VDR binding to D3 vitamins regulate bone mineralization? | VDR knockout mice with rescue by wild-type or mutant VDR knock-in |
| How does DBP affect vitamin D bioavailability in liver disease? | GC knockout mice and liver-specific overexpression |
| What is the role of CYP2R1 in vitamin D status? | CYP2R1 knockout mice and humanized knock-in models |
| Can point mutations in VDR alter ligand specificity? | CRISPR-mediated point mutation knock-in in cell lines |
| Does overexpression of CYP24A1 reduce vitamin D signaling? | CYP24A1 overexpression in osteoblast-like cells |
| How does VDR binding affect follicle development? | Granulosa cell-specific VDR knockout mice |
How to Study the D3 vitamins binding Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Radioligand binding assay | Binding affinity (Kd) and receptor density | Characterizing VDR mutants |
| Surface plasmon resonance | Real-time binding kinetics | Comparing wild-type and mutant proteins |
| Luciferase reporter assay | Transcriptional activity via VDRE | Functional assessment of D3 vitamins binding |
| CRISPR knockout screening | Genes affecting vitamin D response | Identifying novel regulators |
| RNA-seq | Transcriptional changes upon D3 vitamins binding | Mapping VDR target genes |
| ChIP-seq | Genome-wide VDR binding sites | Identifying VDREs and chromatin interactions |
| Proteomics | Protein-protein interactions with VDR | Discovering coactivator complexes |
| Immunofluorescence | Subcellular localization of VDR | Visualizing nuclear translocation upon binding |
Radioligand binding assays
Radioligand binding assays using tritiated 1,25-dihydroxyvitamin D3 are a classic method to measure D3 vitamins binding affinity and kinetics. These assays can determine dissociation constants (Kd) and receptor density (Bmax) in cell lysates or purified protein preparations. They are essential for characterizing mutant VDR proteins generated by CRISPR.
Surface plasmon resonance (SPR)
SPR allows real-time measurement of D3 vitamins binding to immobilized proteins, providing kinetic parameters such as association and dissociation rates. This label-free method is useful for comparing binding affinities of wild-type and mutant proteins and for screening small-molecule modulators.
Transcriptional reporter assays
Reporter assays using vitamin D response elements (VDREs) driving luciferase expression measure the functional consequence of D3 vitamins binding to VDR. These assays are high-throughput and can be used to assess the impact of CRISPR-mediated gene edits on vitamin D signaling.
CRISPR screening and functional genomics
Genome-wide CRISPR knockout screens can identify genes that modulate D3 vitamins binding and downstream responses. Such screens have revealed novel regulators of vitamin D signaling and can be combined with RNA-seq to map transcriptional networks.
How CRISPR Can Be Used to Study GO:1902271 D3 vitamins binding
Knockout
CRISPR knockout of genes involved in D3 vitamins binding, such as VDR or CYP27B1, allows researchers to study the loss-of-function consequences in cell models and animals. Knockout models have revealed essential roles for VDR in bone formation, immune function, and calcium homeostasis. EDITGENE provides custom knockout cell lines and mice to accelerate this research.
Point Mutation
Point mutations in the ligand-binding domain of VDR can alter D3 vitamins binding affinity and specificity. CRISPR-mediated point mutation knock-in enables precise modeling of human genetic variants associated with vitamin D resistance. These models are invaluable for testing vitamin D analogs and understanding structure-function relationships.
Knock-in
Knock-in of tagged VDR (e.g., GFP or HA) allows visualization and purification of the receptor for binding studies. Additionally, knock-in of human VDR into mouse models humanizes the vitamin D system for translational research. EDITGENE offers knock-in services for precise gene editing.
Overexpression
Overexpression of D3 vitamins binding proteins, such as CYP24A1 or DBP, can be achieved via CRISPR activation or lentiviral delivery. Overexpression models help study the effects of elevated binding on vitamin D metabolism and signaling. EDITGENE provides overexpression cell lines and custom constructs.
How EDITGENE Supports D3 vitamins binding Research
Researchers studying D3 vitamins binding-related genes often need to determine whether a candidate gene is causally involved in vitamin D signaling or metabolism. CRISPR-based gene editing offers a powerful approach to create isogenic models with precise genetic alterations, enabling rigorous functional studies. EDITGENE specializes in providing custom CRISPR services to support such research.
Contact EDITGENE today to design your custom CRISPR model for D3 vitamins binding research.
Frequently Asked Questions About D3 vitamins binding
What is GO:1902271 D3 vitamins binding?
GO:1902271 is a Gene Ontology molecular function term defined as binding to D3 vitamins, which includes vitamin D3 (cholecalciferol) and its metabolites.
What genes are involved in D3 vitamins binding?
Key genes include VDR, GC (DBP), CYP2R1, CYP27B1, and CYP24A1, which encode proteins that bind or metabolize D3 vitamins.
How does D3 vitamins binding affect bone health?
Binding of D3 vitamins to VDR regulates calcium absorption and bone mineralization; defects lead to rickets and osteoporosis.
What diseases are associated with D3 vitamins binding?
Chronic liver diseases, vitamin D-dependent rickets, and reproductive disorders have been linked to altered D3 vitamins binding.
What methods are used to study D3 vitamins binding?
Common methods include radioligand binding assays, surface plasmon resonance, reporter assays, and CRISPR screening.
How can CRISPR help study D3 vitamins binding?
CRISPR enables knockout, point mutation, knock-in, and overexpression of genes like VDR to dissect their roles in D3 vitamins binding.
Is vitamin D binding protein the same as D3 vitamins binding?
No, vitamin D binding protein (DBP) is a protein that binds D3 vitamins; D3 vitamins binding is the function of binding itself.
What is the role of VDR in D3 vitamins binding?
VDR is a nuclear receptor that binds 1,25-dihydroxyvitamin D3 and mediates transcriptional effects of vitamin D.
Can D3 vitamins binding cause neurotoxicity?
Excessive vitamin D3 binding may contribute to neurotoxicity through hypercalcemia, as noted in vitamin neurotoxicity reviews.
How does D3 vitamins binding influence follicle development?
VDR-mediated D3 vitamins binding in ovarian granulosa cells regulates follicle development and reproductive function.
Conclusion
GO:1902271 D3 vitamins binding is a fundamental molecular function that underpins the diverse biological actions of vitamin D3. From calcium homeostasis to immune modulation and reproduction, the binding of D3 vitamins to proteins such as VDR and DBP is essential for health. Dysregulation of this binding is implicated in chronic liver diseases, bone disorders, and neurotoxicity. Advances in CRISPR gene editing and high-throughput screening are accelerating our understanding of D3 vitamins binding and its therapeutic potential. EDITGENE provides comprehensive CRISPR services to support researchers in this field, from knockout models to library screening and bioinformatics.
References
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