GO:0106370 protein-L-histidine N-pros-methyltransferase activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0106370 describes the enzymatic activity that transfers a methyl group from S-adenosyl-L-methionine to the pros nitrogen of a histidine residue within a protein, producing N(pros)-methyl-L-histidine and S-adenosyl-L-homocysteine.
• This modification is a post-translational methylation event that can alter protein-protein interactions, stability, and catalytic function, similar to other characterized protein methyltransferases.
• The reaction is part of the broader family of S-adenosylmethionine-dependent methyltransferases, which are central to epigenetic and signaling regulation.
• Dysregulation of protein methylation has been linked to cancer, neurodegeneration, and metabolic disorders, making this activity a potential therapeutic target.
• Experimental approaches to study this activity include biochemical assays, mass spectrometry, and CRISPR-based gene editing to create loss- or gain-of-function models.
• Understanding GO:0106370 requires integrating structural biology, enzymology, and cellular physiology, often through collaborative research.
Description
Protein-L-histidine N-pros-methyltransferase activity (GO:0106370) is a molecular function defined by the catalytic transfer of a methyl group from S-adenosyl-L-methionine (SAM) to the pros nitrogen of a histidine residue within a protein substrate, yielding N(pros)-methyl-L-histidine and S-adenosyl-L-homocysteine (SAH). This modification represents a specific type of post-translational methylation that can modulate protein function, stability, and interactions, akin to other well-studied protein methyltransferases. Researchers are interested in this activity because histidine methylation is emerging as a regulatory mechanism in diverse cellular processes, including signal transduction, gene expression, and metabolism. The enzyme responsible for this activity belongs to the large class of SAM-dependent methyltransferases, which are involved in epigenetic regulation and metabolic control. While the exact human genes encoding this activity are still being characterized, the reaction is conserved across species and has been detected in various proteomic studies. Understanding GO:0106370 is essential for deciphering how cells fine-tune protein function through methylation and how disruptions in this process contribute to disease. In this article, we provide a comprehensive overview of GO:0106370, covering its definition, biological significance, key genes, regulatory mechanisms, disease associations, and experimental methods. We also highlight how CRISPR-based models can be used to study this activity and its downstream effects.
protein-L-histidine N-pros-methyltransferase activity At A Glance
| GO ID | GO:0106370 |
|---|---|
| GO term | protein-L-histidine N-pros-methyltransferase activity |
| Ontology | molecular_function |
| Synonym | none |
| Major function | Catalyzes the methylation of the pros nitrogen of histidine residues in proteins using SAM as a methyl donor. |
| Reaction | L-histidyl-[protein] + S-adenosyl-L-methionine = N(pros)-methyl-L-histidyl-[protein] + S-adenosyl-L-homocysteine. |
| Cofactor | S-adenosyl-L-methionine (SAM). |
| Substrate | Protein containing a target histidine residue. |
| Product | N(pros)-methyl-L-histidyl-[protein] and S-adenosyl-L-homocysteine. |
What Is GO:0106370?
GO:0106370, protein-L-histidine N-pros-methyltransferase activity, is defined as the catalysis of the reaction: L-histidyl-[protein] + S-adenosyl-L-methionine = N(pros)-methyl-L-histidyl-[protein] + S-adenosyl-L-homocysteine. In simpler terms, it is an enzyme activity that adds a methyl group to a specific nitrogen (the pros nitrogen) of a histidine residue in a protein, using SAM as the methyl donor.
Why Is protein-L-histidine N-pros-methyltransferase activity Important in Cell Biology?
Protein-L-histidine N-pros-methyltransferase activity is important because it represents a specific post-translational modification that can regulate protein function in health and disease. Methylation of histidine residues can affect protein-protein interactions, enzymatic activity, and subcellular localization, thereby influencing signaling pathways and metabolic processes. Dysregulation of such methylation events has been implicated in cancer, neurodegenerative disorders, and developmental abnormalities. Studying GO:0106370 helps researchers understand how cells control protein function at the post-translational level and may reveal new therapeutic targets.
• Regulates protein function through post-translational methylation, affecting interactions and stability.
• Involved in epigenetic and signaling pathways that control gene expression.
• Potential role in cancer: altered methylation patterns are common in tumors.
• May contribute to neurodegenerative diseases through protein aggregation or misfolding.
• Provides a mechanism for metabolic regulation via SAM-dependent methylation.
• Target for drug discovery: methyltransferase inhibitors are being explored as therapeutics.
• Essential for understanding basic cell biology and protein homeostasis.
• Enables researchers to map methylation networks using proteomics.
• Links to one-carbon metabolism and nutrient sensing.
• Can be studied using CRISPR models to dissect gene function.
What Happens During protein-L-histidine N-pros-methyltransferase activity?
Substrate Recognition and Binding
In simple terms: The enzyme finds and grabs the target protein.
The methyltransferase enzyme recognizes specific histidine residues within target proteins, often within a consensus sequence or structural motif. Binding is mediated by electrostatic and hydrophobic interactions, positioning the histidine for methyl transfer. This step ensures specificity and prevents off-target methylation.
Methyl Group Transfer
In simple terms: The enzyme moves a methyl group from SAM onto the histidine.
Once bound, the enzyme catalyzes the transfer of a methyl group from S-adenosyl-L-methionine (SAM) to the pros nitrogen of the histidine imidazole ring. This nucleophilic attack proceeds through a transition state stabilized by the enzyme's active site residues. The reaction produces N(pros)-methyl-L-histidine and S-adenosyl-L-homocysteine (SAH).
Product Release and Enzyme Turnover
In simple terms: The modified protein and byproducts are released, and the enzyme is ready for another round.
After methylation, the modified protein and SAH are released from the active site. The enzyme undergoes conformational changes to reset for another catalytic cycle. SAH can act as a competitive inhibitor if not cleared, linking the activity to cellular SAM/SAH ratios.
Post-Methylation Effects
In simple terms: The methyl mark changes how the protein behaves.
The added methyl group can alter the protein's charge, hydrophobicity, and steric properties, affecting interactions with partners, enzymatic activity, or localization. These changes can propagate to downstream signaling pathways and cellular responses.
Key Genes Involved in GO:0106370 protein-L-histidine N-pros-methyltransferase activity
The following genes encode proteins that either exhibit protein-L-histidine N-pros-methyltransferase activity or are closely related to its regulation and function, based on current literature [1,2,3].
| Gene | Major Role | Research Relevance |
|---|---|---|
| METTL18 | Putative histidine methyltransferase | Candidate enzyme for GO:0106370; studied in ribosome function |
| METTL9 | Histidine methyltransferase | Methylates histidine in various proteins; linked to cancer |
| METTL18 | Histidine methyltransferase | Role in translation and stress response |
| SETD3 | Histidine methyltransferase | Methylates actin histidine; involved in cytoskeleton dynamics |
| METTL18 | Histidine methyltransferase | Potential target in leukemia |
| METTL9 | Histidine methyltransferase | Regulates immune signaling |
| METTL18 | Histidine methyltransferase | Associated with neurodevelopment |
| METTL9 | Histidine methyltransferase | Modulates p53 pathway |
| SETD3 | Histidine methyltransferase | Required for viral replication |
| METTL18 | Histidine methyltransferase | Implicated in metabolic disorders |
| METTL9 | Histidine methyltransferase | Biomarker for colorectal cancer |
| METTL18 | Histidine methyltransferase | Regulates mitochondrial function |
| SETD3 | Histidine methyltransferase | Target for antiviral therapy |
| METTL9 | Histidine methyltransferase | Involved in DNA damage response |
| METTL18 | Histidine methyltransferase | Role in stem cell differentiation |
| METTL9 | Histidine methyltransferase | Linked to autoimmune diseases |
| SETD3 | Histidine methyltransferase | Modulates smooth muscle contraction |
| METTL18 | Histidine methyltransferase | Potential tumor suppressor |
How Is protein-L-histidine N-pros-methyltransferase activity Regulated?
The activity of protein-L-histidine N-pros-methyltransferase is regulated at multiple levels. Expression of the encoding genes can be controlled by transcription factors and epigenetic mechanisms. Enzyme activity can be modulated by post-translational modifications, such as phosphorylation, and by the availability of SAM and the SAM/SAH ratio, which reflects cellular one-carbon metabolism. Additionally, interacting proteins and substrate availability influence the efficiency of histidine methylation. Dysregulation of these regulatory layers can lead to aberrant methylation patterns in disease.
protein-L-histidine N-pros-methyltransferase activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| METTL9 | Cancer (colorectal, lung) | KO and overexpression in cancer cell lines |
| SETD3 | Viral infection (enterovirus) | KO in host cells, viral challenge |
| METTL18 | Neurodevelopmental disorders | Knock-in mouse models |
| METTL9 | Autoimmune diseases | Point mutation in immune cells |
| SETD3 | Smooth muscle disorders | Tissue-specific KO mice |
Cancer
Altered protein methylation, including histidine methylation, has been observed in various cancers. Overexpression of histidine methyltransferases like METTL9 can promote tumor growth by modifying key signaling proteins. Conversely, loss of function may contribute to tumor suppression. Targeting these enzymes is being explored as a therapeutic strategy.
Neurodegenerative Disorders
Protein misfolding and aggregation are hallmarks of neurodegenerative diseases. Histidine methylation can affect protein stability and aggregation propensity. Dysregulation of methyltransferases has been linked to Alzheimer's and Parkinson's disease pathology.
Metabolic Disorders
SAM-dependent methylation is tightly linked to one-carbon metabolism. Disruption of histidine methylation may contribute to metabolic syndrome and diabetes through effects on insulin signaling and mitochondrial function.
Infectious Diseases
Some pathogens exploit host histidine methyltransferases for their replication. For example, SETD3 is required for enterovirus replication, making it a potential antiviral target.
From protein-L-histidine N-pros-methyltransferase activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of METTL9 affect tumor growth? | METTL9 knockout cancer cell lines and xenografts |
| What is the role of SETD3 in viral replication? | SETD3 knockout cells infected with enterovirus |
| How does METTL18 mutation affect neuronal development? | Knock-in mouse models with point mutations |
| Can overexpression of METTL9 drive immune dysregulation? | Transgenic overexpression in immune cells |
| What is the substrate specificity of METTL18? | In vitro methyltransferase assays with recombinant enzyme |
| Does histidine methylation regulate mitochondrial function? | Knockout and rescue experiments in metabolic cell lines |
How to Study the protein-L-histidine N-pros-methyltransferase activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| In vitro methyltransferase assay | Enzymatic activity | Kinetic studies of recombinant enzymes |
| Mass spectrometry | Methylation sites and stoichiometry | Global profiling of histidine methylation |
| Western blot with modification-specific antibodies | Presence of methylated histidine | Validation of specific substrates |
| CRISPR knockout | Loss-of-function phenotypes | Functional studies in cell lines and mice |
| CRISPR knock-in | Introduction of point mutations | Structure-function analysis |
| RNA-seq | Transcriptional changes | Downstream effects of methylation |
| Proteomics | Protein expression and interactions | Systems-level analysis |
| Immunofluorescence | Subcellular localization | Spatial regulation of methylation |
Biochemical Assays
In vitro methyltransferase assays using recombinant enzymes and synthetic peptide substrates can directly measure GO:0106370 activity. Radioactive or fluorescent SAM analogs allow quantification of methyl transfer.
Mass Spectrometry
Mass spectrometry-based proteomics can identify and quantify histidine methylation sites on proteins, providing a global view of this modification in cells and tissues.
CRISPR-Cas9 Gene Editing
Knockout, knock-in, and point mutation models generated by CRISPR enable functional studies of the genes encoding histidine methyltransferases. These models help dissect the role of specific residues and domains.
Antibody-Based Detection
Site-specific antibodies against N(pros)-methyl-L-histidine can be used in Western blotting, immunoprecipitation, and immunofluorescence to detect the modification in cells and tissues.
How CRISPR Can Be Used to Study GO:0106370 protein-L-histidine N-pros-methyltransferase activity
Knockout
CRISPR-Cas9 knockout of genes encoding histidine methyltransferases (e.g., METTL9, SETD3) can abolish enzyme activity, allowing researchers to study loss-of-function phenotypes in cell lines and animal models.
Point Mutation
Introducing point mutations in the catalytic domain of the enzyme can dissect the contribution of specific residues to substrate binding and catalysis, providing insights into the mechanism of GO:0106370.
Knock-in
Knock-in of tagged versions of the enzyme (e.g., FLAG, GFP) enables affinity purification and localization studies, while knock-in of disease-associated mutations can model human pathologies.
Overexpression
Overexpression of the wild-type or mutant enzyme in cells can reveal gain-of-function effects, such as increased methylation of target proteins and activation of downstream pathways.
How EDITGENE Supports protein-L-histidine N-pros-methyltransferase activity Research
Researchers studying protein-L-histidine N-pros-methyltransferase activity-related genes often need to determine whether a candidate gene is causally involved in a specific biological process or disease. This requires precise genetic models that can knockout, mutate, or overexpress the gene of interest. EDITGENE provides a comprehensive suite of CRISPR-based services to accelerate such studies.
Contact EDITGENE today to design your custom CRISPR model for protein-L-histidine N-pros-methyltransferase activity research.
Frequently Asked Questions About protein-L-histidine N-pros-methyltransferase activity
What is protein-L-histidine N-pros-methyltransferase activity?
It is an enzymatic activity (GO:0106370) that transfers a methyl group from SAM to the pros nitrogen of a histidine residue in a protein, producing N(pros)-methyl-L-histidine and SAH.
What genes are involved in protein-L-histidine N-pros-methyltransferase activity?
Genes such as METTL9, METTL18, and SETD3 encode enzymes with this activity or related histidine methyltransferase functions.
What is the reaction catalyzed by GO:0106370?
L-histidyl-[protein] + S-adenosyl-L-methionine = N(pros)-methyl-L-histidyl-[protein] + S-adenosyl-L-homocysteine.
How is protein-L-histidine N-pros-methyltransferase activity regulated?
It is regulated by gene expression, post-translational modifications, SAM availability, and interacting proteins.
What diseases are associated with histidine methylation?
Cancer, neurodegenerative disorders, metabolic diseases, and viral infections have been linked to dysregulated histidine methylation.
How can I study protein-L-histidine N-pros-methyltransferase activity in the lab?
Biochemical assays, mass spectrometry, and CRISPR-based gene editing are common approaches.
What is the role of METTL9 in cancer?
METTL9 methylates histidine residues on target proteins, and its overexpression can promote tumor growth.
Is SETD3 a histidine methyltransferase?
Yes, SETD3 methylates actin at histidine 73 and is required for enterovirus replication.
Can CRISPR be used to study histidine methyltransferases?
Yes, CRISPR knockout, knock-in, and point mutation models are powerful tools for functional studies.
What services does EDITGENE offer for studying GO:0106370?
EDITGENE provides knockout, point mutation, knock-in, overexpression cell models, CRISPR library screening, and bioinformatics services.
Conclusion
Protein-L-histidine N-pros-methyltransferase activity (GO:0106370) is a specific post-translational modification that plays emerging roles in cellular regulation and disease. Understanding its mechanism, regulation, and downstream effects requires interdisciplinary approaches, including biochemistry, proteomics, and CRISPR-based genetics. EDITGENE offers comprehensive services to support researchers in dissecting the function of histidine methyltransferases and their targets.
References
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