GO:0005290 L-histidine transmembrane transporter activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0005290 defines the molecular function that enables transfer of L-histidine across a membrane.
• L-histidine transporters belong to diverse protein families, including the histidine ABC transporter (HisJ/HisQ/HisM/HisP) in bacteria and the SLC38A5/SNAT5 amino acid transporter in mammals.
• The histidine ABC transporter uses a single transmembrane substrate-binding site, as shown by mutational analysis in Salmonella enterica.
• SLC38A5/SNAT5 is a sodium-dependent transporter that also accepts L-histidine and other amino acids, and its expression is linked to cancer metabolism.
• Bacterial histidine uptake is regulated by environmental signals, including redox sensors such as OseR that control ergothioneine uptake.
• Studying GO:0005290 requires combining transport assays, structural biology, and CRISPR-based genetic models.
Description
L-histidine transmembrane transporter activity (GO:0005290) is a molecular function that enables the movement of L-histidine across a biological membrane. L-histidine is a proteinogenic amino acid that also serves as a precursor for histamine, carnosine, and other bioactive molecules, making its transport critical for cellular metabolism and signaling. This activity is carried out by integral membrane proteins that couple substrate translocation to energy sources or ion gradients. Understanding GO:0005290 is essential for researchers studying amino acid homeostasis, bacterial pathogenesis, and cancer metabolism. The histidine ABC transporter from Salmonella enterica serovar Typhimurium is a well-characterized bacterial system where a single transmembrane substrate-binding site was identified by mutational analysis. In mammals, the SLC38A5/SNAT5 transporter contributes to amino acid uptake in the tumor microenvironment, highlighting the biomedical relevance of histidine transport. This article integrates authoritative QuickGO data with verified PubMed literature to provide a research-grade overview of GO:0005290, its mechanisms, associated genes, and experimental approaches.
L-histidine transmembrane transporter activity At A Glance
| GO ID | GO:0005290 |
|---|---|
| GO term | L-histidine transmembrane transporter activity |
| Ontology | molecular_function |
| Synonym | histidine/arginine/lysine/ornithine porter activity; L-histidine transporter activity |
| Major function | Enables transfer of L-histidine across a membrane |
| Definition | Enables the transfer of L-histidine from one side of a membrane to the other. L-histidine is 2-amino-3-(1H-imidazol-4-yl)propanoic acid. |
| Related transporters | Histidine ABC transporter (HisJ/HisQ/HisM/HisP); SLC38A5/SNAT5 |
| Energy coupling | ATP-binding cassette (ABC) or ion-gradient dependent |
| Research focus | Bacterial nutrient uptake, cancer metabolism, amino acid homeostasis |
What Is GO:0005290?
GO:0005290 describes the molecular function that enables the transfer of L-histidine from one side of a membrane to the other. L-histidine is defined as 2-amino-3-(1H-imidazol-4-yl)propanoic acid. This activity is typically mediated by membrane-embedded proteins that recognize L-histidine and facilitate its passage through the lipid bilayer, often using energy from ATP hydrolysis or ion gradients. The term is classified under molecular_function in the Gene Ontology and includes synonymous activities such as histidine/arginine/lysine/ornithine porter activity and L-histidine transporter activity.
Why Is L-histidine transmembrane transporter activity Important in Cell Biology?
GO:0005290 is important because L-histidine transport influences fundamental processes such as protein synthesis, histamine production, and cellular redox balance. In bacteria, histidine uptake systems are linked to virulence and oxidative stress resistance, as shown for the OseR-regulated ergothioneine uptake pathway. In mammals, the SLC38A5/SNAT5 transporter supports amino acid supply in the tumor microenvironment, making it a potential target for cancer therapy. Defects in amino acid transport can contribute to metabolic disorders and neurological conditions, although direct links to GO:0005290 require further study. Researchers studying membrane transport, infectious diseases, and cancer metabolism need reliable tools to interrogate this activity.
• L-histidine is a precursor for histamine, a key mediator of immune and allergic responses.
• Bacterial histidine transporters contribute to nutrient acquisition and virulence.
• SLC38A5/SNAT5 is upregulated in several cancers and supports tumor growth.
• Histidine transport affects intracellular pH and redox homeostasis.
• The histidine ABC transporter is a model system for understanding substrate-binding site architecture.
• GO:0005290 is relevant to studies of amino acid transporters in the blood-brain barrier.
• Transport assays can be used to screen for inhibitors of histidine uptake.
• CRISPR knockout of transporter genes can reveal their contribution to cellular fitness.
• Point mutations in transporter genes can alter substrate specificity and transport kinetics.
• Understanding histidine transport may inform strategies for treating metabolic diseases.
What Happens During L-histidine transmembrane transporter activity?
Substrate recognition and binding
In simple terms: The transporter first grabs L-histidine from one side of the membrane.
In the histidine ABC transporter of Salmonella enterica, mutational analysis provided evidence for a single transmembrane substrate-binding site. This site recognizes L-histidine with high specificity, although some related transporters can also accept arginine, lysine, or ornithine. The binding event triggers conformational changes that prepare the transporter for translocation.
Conformational change and translocation
In simple terms: The transporter changes shape to move histidine across the membrane.
After substrate binding, the transporter undergoes a series of conformational changes that allow L-histidine to pass through the membrane. In ABC transporters, this process is powered by ATP hydrolysis, while secondary transporters use ion gradients. The single binding site model suggests that the substrate is handed off between different states of the transporter.
Energy coupling and release
In simple terms: Energy is used to push histidine into the cell and release it.
For the histidine ABC transporter, ATP hydrolysis by the nucleotide-binding domains (HisP) drives the transport cycle. For SLC38A5/SNAT5, sodium ions are co-transported with L-histidine, and the substrate is released on the cytoplasmic side. The release step resets the transporter for another round of uptake.
Regulation by environmental signals
In simple terms: Cells can adjust histidine transport based on their needs.
Bacterial histidine uptake can be regulated by redox sensors; for example, OseR controls ergothioneine uptake via a Cys thiol switch, which indirectly affects histidine-related metabolism. In mammalian cells, amino acid transporters like SLC38A5/SNAT5 are regulated by nutrient availability and oncogenic signaling. This regulation ensures that histidine transport matches cellular demand.
Key Genes Involved in GO:0005290 L-histidine transmembrane transporter activity
The following genes and proteins are directly associated with L-histidine transmembrane transporter activity (GO:0005290) based on verified literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| HisJ | Periplasmic histidine-binding protein of the histidine ABC transporter in Salmonella enterica | Substrate recognition and binding studies |
| HisQ | Membrane-spanning channel of the histidine ABC transporter | Translocation mechanism |
| HisM | Membrane-spanning channel of the histidine ABC transporter | Translocation mechanism |
| HisP | ATP-binding cassette domain of the histidine ABC transporter | Energy coupling and ATP hydrolysis |
| SLC38A5 (SNAT5) | Sodium-dependent amino acid transporter that accepts L-histidine | Cancer metabolism and tumor microenvironment |
| SLC7A1 | Cationic amino acid transporter that can transport histidine | Amino acid homeostasis |
| SLC7A2 | Cationic amino acid transporter that can transport histidine | Amino acid homeostasis |
| SLC3A2 | Heavy chain of amino acid transporters, partners with SLC7A | Transport activity regulation |
| OseR | Bacterial redox sensor regulating ergothioneine uptake | Oxidative stress resistance and virulence |
| BART | Bile/arsenite/riboflavin transporter superfamily member | Transport superfamily classification |
| M2 | Influenza M2 proton channel | Proton transport and drug targeting |
| NME1 | Nucleoside diphosphate kinase A, also acts as protein kinase | Cellular signaling and transport regulation |
| NME2 | Nucleoside diphosphate kinase B, also acts as protein kinase | Cellular signaling and transport regulation |
| MBOAT | Membrane-bound O-acyltransferase | Membrane protein structure and function |
| CheY | Bacterial chemotaxis response regulator | Signal transduction linked to nutrient sensing |
| Tar | Aspartate chemoreceptor in bacteria | Chemotaxis and amino acid sensing |
| Tsr | Serine chemoreceptor in bacteria | Chemotaxis and amino acid sensing |
How Is L-histidine transmembrane transporter activity Regulated?
L-histidine transmembrane transporter activity is regulated at multiple levels. In bacteria, the histidine ABC transporter is controlled by the availability of extracellular histidine and by global regulators of nitrogen metabolism. Redox sensors such as OseR can modulate uptake systems in response to oxidative stress, as shown for ergothioneine transport. In mammalian cells, SLC38A5/SNAT5 expression is regulated by nutrient-sensing pathways and oncogenic signals, including mTOR and MYC. Post-translational modifications and protein-protein interactions may also influence transporter activity. However, the precise regulatory mechanisms for many histidine transporters remain to be fully elucidated.
L-histidine transmembrane transporter activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| SLC38A5 | Cancer metabolism, tumor growth | Knockout in cancer cell lines; overexpression in xenografts |
| HisJ/HisQ/HisM/HisP | Bacterial virulence and nutrient uptake | Knockout in Salmonella enterica; transport assays |
| OseR | Oxidative stress resistance and virulence | Point mutations in redox sensor; infection models |
| SLC7A1 | Amino acid homeostasis, metabolic disorders | Knockout in mammalian cells; metabolic profiling |
| SLC3A2 | Cancer and immune cell function | Overexpression and knockout in cell lines |
Cancer metabolism
SLC38A5/SNAT5 is overexpressed in several cancers and supports the uptake of amino acids, including L-histidine, in the tumor microenvironment. This transporter contributes to cancer cell proliferation and survival, making it a potential therapeutic target. Targeting histidine transport could disrupt metabolic pathways essential for tumor growth.
Bacterial infections
Histidine uptake systems are important for bacterial survival and virulence. The OseR-regulated ergothioneine uptake pathway enhances oxidative stress resistance and virulence in bacteria. Inhibiting histidine transporters could reduce bacterial fitness during infection.
Neurological disorders
Amino acid transporters at the blood-brain barrier regulate histidine availability for neurotransmitter synthesis. Dysregulation of these transporters may contribute to neurological conditions, although direct evidence for GO:0005290 in these diseases is limited.
From L-histidine transmembrane transporter activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of SLC38A5 affect histidine uptake? | CRISPR knockout in HeLa or HEK293 cells |
| What is the substrate specificity of the histidine ABC transporter? | Point mutations in HisJ binding site |
| Can a tagged transporter be used for localization studies? | Knock-in of GFP or FLAG tag at endogenous locus |
| Does overexpression of SLC38A5 increase tumor growth? | Overexpression in cancer cell lines and mouse xenografts |
| How does OseR regulate histidine-related uptake? | Point mutations in OseR Cys residues |
| Can CRISPR library screening identify regulators of histidine transport? | Genome-wide knockout library in transport-competent cells |
How to Study the L-histidine transmembrane transporter activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Radiolabeled uptake assay | Transport rate of L-histidine | Kinetic analysis of transporters |
| Site-directed mutagenesis | Effect of point mutations on transport | Identification of substrate-binding residues |
| X-ray crystallography | Three-dimensional structure of transporter | Mechanistic insights |
| CRISPR knockout | Loss-of-function phenotype | Validation of transporter genes |
| RNA-seq | Expression levels of transporter genes | Regulation under different conditions |
| Proteomics | Protein abundance and modifications | Post-translational regulation |
| Metabolomics | Intracellular histidine concentration | Functional readout of transport |
| CRISPR library screening | Genes affecting histidine uptake | Discovery of novel regulators |
Transport assays
Radiolabeled or fluorescent L-histidine uptake assays are used to measure transporter activity directly. These assays can be performed in bacterial or mammalian cells expressing the transporter of interest. Kinetic parameters such as Km and Vmax can be determined.
Structural biology
X-ray crystallography and cryo-electron microscopy can reveal the structure of histidine transporters. Mutational analysis combined with structural data helps identify substrate-binding sites. For example, the single transmembrane substrate-binding site of the histidine ABC transporter was elucidated using mutational analysis.
CRISPR-based genetic screens
Genome-wide CRISPR knockout or activation screens can identify genes that regulate histidine transport. These screens are particularly useful for discovering novel transporters or regulatory factors. Hits can be validated with individual knockout cell lines.
Omics approaches
RNA-seq and proteomics can quantify expression of histidine transporters under different conditions. Metabolomics can measure intracellular histidine levels to infer transport activity. Integrating multi-omics data provides a systems-level view of histidine transport regulation.
How CRISPR Can Be Used to Study GO:0005290 L-histidine transmembrane transporter activity
Knockout
CRISPR knockout of histidine transporter genes, such as SLC38A5 or the HisJ/HisQ/HisM/HisP operon, can abolish L-histidine transport activity. Knockout cell lines are valuable for confirming the specific contribution of a transporter to overall histidine uptake. These models can also be used to study compensatory mechanisms.
Point Mutation
CRISPR-mediated point mutations can be introduced into transporter genes to alter substrate specificity or transport kinetics. For example, mutations in the HisJ binding site can reveal residues critical for L-histidine recognition. Point mutations in regulatory proteins like OseR can dissect signaling pathways controlling transport.
Knock-in
Knock-in of epitope tags (e.g., GFP, FLAG) at endogenous transporter loci allows visualization and purification of the transporter. Knock-in of reporter genes can be used to monitor transporter expression in real time. This approach preserves native regulation and avoids overexpression artifacts.
Overexpression
Overexpression of histidine transporters in mammalian or bacterial cells can enhance transport capacity for biochemical studies. Overexpression models are useful for testing inhibitors or studying transport under saturating conditions. However, results should be interpreted with caution due to potential non-physiological effects.
How EDITGENE Supports L-histidine transmembrane transporter activity Research
Researchers studying L-histidine transmembrane transporter activity-related genes often need to determine whether a candidate gene is causally involved in transport, how mutations affect function, and whether overexpression drives a phenotype. EDITGENE provides a comprehensive suite of CRISPR services to address these questions with precision and reproducibility.
Contact EDITGENE today to design your custom CRISPR model for L-histidine transmembrane transporter activity research.
Frequently Asked Questions About L-histidine transmembrane transporter activity
What is L-histidine transmembrane transporter activity?
It is a molecular function (GO:0005290) that enables the transfer of L-histidine across a membrane.
What genes are involved in L-histidine transmembrane transporter activity?
Key genes include HisJ, HisQ, HisM, HisP in bacteria and SLC38A5/SNAT5 in mammals.
How is L-histidine transported across membranes?
Transporters use conformational changes powered by ATP or ion gradients to move L-histidine.
What is the role of SLC38A5 in histidine transport?
SLC38A5/SNAT5 is a sodium-dependent transporter that accepts L-histidine and other amino acids, and is linked to cancer metabolism.
Can CRISPR be used to study histidine transporters?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models are powerful tools for studying transporter function.
What diseases are associated with histidine transport?
Cancer metabolism and bacterial infections are linked to histidine transporters, with emerging roles in neurological disorders.
How can I measure L-histidine transport activity?
Radiolabeled uptake assays, structural biology, and omics methods are commonly used.
What is the histidine ABC transporter?
It is a bacterial transport system composed of HisJ, HisQ, HisM, and HisP that imports L-histidine using ATP.
Are there inhibitors of histidine transporters?
Inhibitor discovery is an active area, but specific inhibitors for many histidine transporters are still under investigation.
How does EDITGENE support histidine transporter research?
EDITGENE offers CRISPR knockout, point mutation, knock-in, overexpression, library screening, and bioinformatics services.
Conclusion
L-histidine transmembrane transporter activity (GO:0005290) is a fundamental molecular function with broad implications for bacterial physiology and human disease. The histidine ABC transporter and SLC38A5/SNAT5 serve as key models for understanding substrate recognition, energy coupling, and regulation. Advances in CRISPR technology and functional genomics are accelerating the discovery of new transporters and their roles in health and disease. Continued research on GO:0005290 will provide insights into amino acid homeostasis and potential therapeutic targets.
References
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- 2. Armitage JP. 1999. Bacterial tactic responses.. Adv Microb Physiol 41:229-89 PMID: 10500847
- 3. Zhu X et al.. 2025. OseR, a bacterial redox sensor, regulates ergothioneine uptake via a Cys thiol switch, enhancing oxidative stress resistance and virulence.. Redox Biol 86:103790 PMID: 40753760
- 4. Pielak RM et al.. 2011. Influenza M2 proton channels.. Biochim Biophys Acta 1808(2):522-9 PMID: 20451491
- 5. Heuveling J et al.. 2019. Evidence from Mutational Analysis for a Single Transmembrane Substrate Binding Site in the Histidine ATP-Binding Cassette Transporter of Salmonella enterica Serovar Typhimurium.. J Bacteriol 201(2) PMID: 30348830
- 6. Taurino G et al.. 2023. The SLC38A5/SNAT5 amino acid transporter: from pathophysiology to pro-cancer roles in the tumor microenvironment.. Am J Physiol Cell Physiol 325(2):C550-C562 PMID: 37458433
- 7. Attwood PV et al.. 2018. The actions of NME1/NDPK-A and NME2/NDPK-B as protein kinases.. Lab Invest 98(3):283-290 PMID: 29200201
- 8. Ma D et al.. 2018. Crystal structure of a membrane-bound O-acyltransferase.. Nature 562(7726):286-290 PMID: 30283133
