GO:0051032 nucleic acid transmembrane transporter activity: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0051032 (nucleic acid transmembrane transporter activity) is a molecular function that enables the transfer of single- or double-stranded polynucleotides across a membrane.
• This activity is distinct from nucleic acid binding or nuclease activity; it specifically requires membrane translocation of the nucleic acid substrate.
• Nucleobase transporters, which move free nucleobases rather than polynucleotides, are functionally related but represent a separate transport class.
• Aberrant phase separation of nucleic acid-binding proteins can remodel membranous organelles and drive tumorigenesis, highlighting the importance of nucleic acid transport and localization.
• Innate immune DNA sensing pathways depend on the delivery of foreign or mislocalized DNA across membranes, a process that can involve nucleic acid transmembrane transport.
• CRISPR-based knockout, knock-in, and overexpression models are essential to causally test candidate nucleic acid transmembrane transporter genes [1,2].
Description
Nucleic acid transmembrane transporter activity (GO:0051032) is a molecular function that enables the movement of nucleic acids, defined as single- or double-stranded polynucleotides involved in the storage, transmission, and transfer of genetic information, from one side of a membrane to the other. This activity is fundamental to processes such as genetic exchange, immune surveillance, and organelle remodeling, where polynucleotides must cross lipid bilayers that are otherwise impermeable to charged macromolecules [1,6]. Researchers studying this term are often interested in how cells import or export DNA and RNA, how pathogens deliver genetic material, and how mislocalized nucleic acids trigger disease [2,6]. The function is mechanistically distinct from nucleic acid binding, nuclease activity, or nucleobase transport. Nucleobase transporters, for example, move free bases such as adenine or guanine, not polynucleotides, and are classified under a different transport activity. In contrast, GO:0051032 specifically requires the translocation of a nucleic acid polymer across a membrane, a process that can be coupled to ATP hydrolysis, ion gradients, or conformational changes in a transmembrane channel. Understanding GO:0051032 is critical because defects in nucleic acid transport can lead to failed immune sensing, aberrant organelle remodeling, and tumorigenesis [2,6]. Moreover, the activity is a potential therapeutic target in conditions ranging from cystic fibrosis, where membrane protein misfolding alters transport functions, to diarrhea, where RNA therapeutics are being developed to modulate transport and secretion. This article synthesizes the current knowledge of GO:0051032, its gene players, regulatory context, and experimental models for functional dissection.
nucleic acid transmembrane transporter activity At A Glance
| GO ID | GO:0051032 |
|---|---|
| GO term | nucleic acid transmembrane transporter activity |
| Ontology | molecular_function |
| Synonym | none |
| Major function | Transfer of single- or double-stranded polynucleotides across a membrane |
| Substrate | Nucleic acids (DNA or RNA, single- or double-stranded) |
| Directionality | Can be import into or export out of a membrane-bound compartment |
| Cellular context | Plasma membrane, organelle membranes, and pathogen-containing vacuoles |
| Related activity | Nucleobase transporters (distinct substrate class) |
What Is GO:0051032?
GO:0051032, nucleic acid transmembrane transporter activity, is defined as enabling the transfer of nucleic acids from one side of a membrane to the other. Nucleic acids are single- or double-stranded polynucleotides involved in the storage, transmission, and transfer of genetic information. This activity is a molecular function that requires a membrane-spanning transport machinery and results in the net movement of a nucleic acid substrate across a lipid bilayer.
Why Is nucleic acid transmembrane transporter activity Important in Cell Biology?
GO:0051032 is important because nucleic acid transport across membranes is a prerequisite for genetic exchange, innate immune DNA sensing, and organelle homeostasis [1,6]. Dysregulation of this activity can lead to the accumulation of nucleic acids in inappropriate compartments, triggering inflammation or oncogenic transformation [2,6]. In addition, membrane protein misfolding diseases such as cystic fibrosis illustrate how defects in membrane transport machinery can have systemic consequences. As RNA therapeutics advance, understanding nucleic acid transmembrane transport will be essential for delivering oligonucleotides to the correct cellular compartments.
• Enables genetic exchange and horizontal gene transfer across membranes.
• Required for innate immune sensing of foreign or mislocalized DNA.
• Contributes to membranous organelle remodeling and tumorigenesis when aberrant.
• Distinct from nucleobase transport, which moves free bases rather than polynucleotides.
• Relevant to cystic fibrosis, where membrane protein misfolding alters transport functions.
• Potential target for RNA therapeutics in diarrhea and other transport-related diseases.
• Involved in photopharmacological control of membrane transport processes.
• Provides a mechanistic entry point for CRISPR screens of membrane transporters [1,2].
• Links nucleic acid localization to cell volume regulation and amino acid transport.
• Essential for understanding how cells maintain compartmental identity.
What Happens During nucleic acid transmembrane transporter activity?
Substrate recognition and binding
In simple terms: The transporter first grabs the nucleic acid it needs to move.
The first step in nucleic acid transmembrane transporter activity is the recognition and binding of a single- or double-stranded polynucleotide substrate. This binding is typically mediated by electrostatic interactions between positively charged residues in the transporter and the negatively charged phosphate backbone of the nucleic acid. Specificity can be achieved through structural features such as groove-binding domains or sequence-independent electrostatic patches, as seen in membrane-associated nucleic acid sensors and transporters. In the context of innate immune DNA sensing, the transporter must distinguish foreign DNA from self-DNA to avoid autoimmunity.
Membrane translocation
In simple terms: The transporter moves the nucleic acid across the membrane.
Once bound, the nucleic acid is translocated across the lipid bilayer. This step may require ATP hydrolysis, ion gradients, or conformational changes in the transporter. For example, P-type ATPases such as ERMA (TMEM94) transport ions across the endoplasmic reticulum membrane and illustrate how membrane proteins can couple transport to conformational cycles. Although ERMA transports Mg2+, the principle of membrane-spanning transport is shared with nucleic acid transporters. In the case of nucleic acid transport, the large size and negative charge of the substrate necessitate a dedicated channel or pump mechanism.
Release and compartmentalization
In simple terms: The nucleic acid is released on the other side of the membrane.
After translocation, the nucleic acid is released into the target compartment, such as the cytoplasm, nucleus, or an endosome. This release may be triggered by a change in pH, ion concentration, or conformational state of the transporter. Proper release is critical for downstream functions such as immune signaling or gene expression. Aberrant release or failure to release can lead to nucleic acid accumulation in the wrong compartment, which has been linked to membranous organelle remodeling and tumorigenesis.
Coupling to cellular processes
In simple terms: The transport event is linked to larger cellular jobs.
Nucleic acid transmembrane transport is often coupled to other cellular processes. For instance, in innate immune DNA sensing, the transport of DNA into the cytoplasm activates cGAS-STING and other pathways. In cell volume regulation, the neutral amino acid transporter SNAT2 is linked to transport-related signaling, showing how membrane transport can be integrated with cellular homeostasis. Similarly, RNA therapeutics for diarrhea aim to modulate transport processes, highlighting the therapeutic relevance of understanding these coupled events.
Key Genes Involved in GO:0051032 nucleic acid transmembrane transporter activity
The following genes and proteins are experimentally or functionally associated with nucleic acid transmembrane transport or related membrane transport processes, based on the verified literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| CFTR | Chloride channel; membrane transport and misfolding in cystic fibrosis | Model for membrane protein misfolding and transport dysfunction |
| TMEM94 (ERMA) | P-type ATPase transporter for Mg2+ uptake in the endoplasmic reticulum | Example of membrane transporter mechanism and organelle homeostasis |
| SNAT2 (SLC38A2) | Neutral amino acid transporter involved in cell volume regulation | Links transport activity to cellular homeostasis |
| cGAS | Cytosolic DNA sensor in innate immunity | Requires DNA transport or mislocalization for activation |
| STING | Adaptor in innate immune DNA sensing | Downstream of nucleic acid transport events |
| Nucleobase transporters | Transport free nucleobases, not polynucleotides | Distinct from GO:0051032 but functionally related |
| Phase-separated proteins | Drive membranous organelle remodeling | Aberrant phase separation linked to tumorigenesis |
| Photopharmacology targets | Membrane proteins controllable by light | Tool for studying transport in vivo |
| RNA therapeutic targets | Modulate transport in diarrhea | Potential for RNA-based modulation |
| Membrane trafficking regulators | Control organelle remodeling | Implicated in cancer and organelle dynamics |
| Ion channels | Facilitate ion gradients for transport | Provide driving force for nucleic acid transport |
| ATPases | Hydrolyze ATP for transport | Provide energy for active transport |
| Lipid bilayer components | Form the membrane barrier | Determine permeability to nucleic acids |
| Endosomal proteins | Regulate vesicle transport | Involved in nucleic acid release |
| Nuclear pore components | Regulate nucleocytoplasmic transport | Related to nucleic acid transport across nuclear envelope |
| Viral delivery proteins | Mediate nucleic acid transfer | Model for transmembrane transport |
| Exosome components | Secrete nucleic acids | Extracellular nucleic acid transport |
How Is nucleic acid transmembrane transporter activity Regulated?
Nucleic acid transmembrane transporter activity is regulated at multiple levels. Transcriptional control of transporter genes, post-translational modifications such as phosphorylation, and membrane trafficking determine the availability of transporters at the membrane. In innate immune DNA sensing, the activity is regulated by the availability of DNA in the cytoplasm and by negative regulators that prevent self-DNA recognition. Phase separation of nucleic acid-binding proteins can also regulate the formation of membranous organelles and indirectly influence transport. Additionally, cell volume regulation pathways involving SNAT2 can modulate transport activity in response to osmotic stress.
nucleic acid transmembrane transporter activity and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| CFTR | Cystic fibrosis | Knock-in of CFTR mutations in cell lines |
| TMEM94 | ER Mg2+ homeostasis | Knockout in HeLa or HEK293 cells |
| SNAT2 | Cell volume regulation | Overexpression and knockdown in epithelial cells |
| cGAS/STING | Innate immune DNA sensing | Knockout in macrophages or fibroblasts |
| Phase-separated proteins | Tumorigenesis | Overexpression of phase-separation mutants |
Cystic fibrosis and membrane transport dysfunction
Cystic fibrosis is caused by mutations in CFTR, a membrane protein whose misfolding leads to defective transport. Although CFTR is a chloride channel, the disease exemplifies how membrane transport dysfunction can cause systemic pathology. Understanding nucleic acid transmembrane transport in the context of CFTR biology may reveal new therapeutic strategies.
Cancer and aberrant organelle remodeling
Aberrant phase separation of nucleic acid-binding proteins drives membranous organelle remodeling and tumorigenesis. This suggests that dysregulated nucleic acid transport or localization can contribute to cancer. Targeting the transport machinery may offer a therapeutic avenue.
Innate immune DNA sensing and autoimmunity
Innate immune DNA sensing pathways depend on the delivery of DNA to the cytoplasm. Defects in nucleic acid transmembrane transport can lead to failed immune responses or autoimmunity due to mislocalized self-DNA.
Diarrhea and RNA therapeutics
RNA therapeutics are being developed for diarrhea, where modulation of transport processes is a key goal. Understanding nucleic acid transmembrane transport can aid in the design of RNA-based drugs that target transport pathways.
From nucleic acid transmembrane transporter activity-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Is the candidate gene required for nucleic acid transport? | CRISPR knockout in a relevant cell line |
| Does a specific mutation alter transport activity? | Point mutation knock-in |
| Can a tagged transporter be visualized? | Tagged knock-in (e.g., GFP) |
| Does overexpression drive organelle remodeling? | Overexpression of wild-type or mutant protein |
| Which genes regulate transport? | CRISPR library screening [1,2] |
| How does transport affect immune sensing? | Knockout of cGAS/STING in immune cells |
How to Study the nucleic acid transmembrane transporter activity Process
| Method | What It Measures | Typical Application |
|---|---|---|
| CRISPR knockout | Loss of gene function | Identify essential transporters |
| Point mutation knock-in | Effect of specific mutations | Structure-function studies |
| Overexpression | Gain of function | Organelle remodeling assays |
| Tagged knock-in | Protein localization | Live-cell imaging |
| CRISPR library screen | Genome-wide fitness | Discover novel regulators [1,2] |
| RNA-seq | Transcriptional changes | Pathway analysis |
| Proteomics | Protein interactions | Identify transport complexes |
| Bioinformatics | Network and pathway enrichment | Data mining |
CRISPR knockout and knock-in
CRISPR-Cas9 knockout is used to eliminate candidate transporter genes and assess loss-of-function phenotypes. Knock-in of point mutations allows structure-function studies, such as those performed for CFTR.
Overexpression and tagged knock-in
Overexpression of wild-type or mutant transporters can reveal gain-of-function effects, including organelle remodeling. Tagged knock-in enables live-cell imaging of transporter localization.
CRISPR library screening
Genome-wide CRISPR screens can identify genes required for nucleic acid transport or immune sensing [1,2]. This approach is powerful for discovering novel transporters and regulators.
Bioinformatics and pathway analysis
Bioinformatics analysis of transcriptomic and proteomic data can reveal co-expression networks and pathways associated with nucleic acid transmembrane transport [2,6].
How CRISPR Can Be Used to Study GO:0051032 nucleic acid transmembrane transporter activity
Knockout
CRISPR knockout of candidate nucleic acid transporter genes is used to test whether they are required for transport, immune sensing, or organelle homeostasis [1,6]. For example, knocking out cGAS or STING abolishes DNA sensing.
Point Mutation
Point mutation knock-in models, such as those for CFTR, allow precise dissection of transport mechanisms and misfolding. This approach is valuable for studying disease-associated variants.
Knock-in
Tagged knock-in of transporters enables visualization and biochemical purification. This can reveal dynamic localization during transport events.
Overexpression
Overexpression of wild-type or mutant transporters can drive membranous organelle remodeling and tumorigenesis, providing a model for gain-of-function studies.
How EDITGENE Supports nucleic acid transmembrane transporter activity Research
Researchers studying nucleic acid transmembrane transporter activity-related genes often need to determine whether a candidate gene is causally involved in transport, immune sensing, or organelle remodeling. EDITGENE provides a comprehensive suite of CRISPR services to enable these investigations.
Contact EDITGENE today to design your custom CRISPR model for nucleic acid transmembrane transporter activity research.
Frequently Asked Questions About nucleic acid transmembrane transporter activity
What is nucleic acid transmembrane transporter activity?
It is a molecular function (GO:0051032) that enables the transfer of single- or double-stranded polynucleotides across a membrane.
What genes are involved in nucleic acid transmembrane transporter activity?
Genes such as CFTR, TMEM94, and cGAS/STING are functionally related to membrane transport and nucleic acid sensing [1,5,6].
How is GO:0051032 different from nucleobase transport?
Nucleobase transporters move free bases, not polynucleotides, and are classified separately.
What diseases are linked to nucleic acid transmembrane transport?
Cystic fibrosis, cancer, autoimmunity, and diarrhea have been linked to transport dysfunction [1,2,6,8].
What experimental models are used to study GO:0051032?
CRISPR knockout, knock-in, overexpression, and library screening are commonly used [1,2].
How can I study nucleic acid transmembrane transport in my lab?
You can use CRISPR knockout of candidate genes, followed by transport assays and imaging [1,5].
What is the role of phase separation in nucleic acid transport?
Aberrant phase separation can drive membranous organelle remodeling and tumorigenesis.
Can RNA therapeutics target nucleic acid transport?
Yes, RNA therapeutics are being developed for diarrhea and other conditions involving transport.
What is the connection between nucleic acid transport and innate immunity?
Innate immune DNA sensing requires DNA to be transported or mislocalized to the cytoplasm.
How does EDITGENE support research on GO:0051032?
EDITGENE offers knockout, knock-in, overexpression, library screening, and bioinformatics services [1,2,5].
Conclusion
Nucleic acid transmembrane transporter activity (GO:0051032) is a critical molecular function that enables the movement of polynucleotides across membranes, with far-reaching implications for immunity, organelle biology, and disease [1,6]. Understanding its mechanisms and regulation requires robust experimental models, including CRISPR-based knockout, knock-in, and overexpression systems [1,2]. EDITGENE provides the tools and expertise to accelerate research in this field.
References
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- 2. Wang X et al.. 2025. Aberrant phase separation drives membranous organelle remodeling and tumorigenesis.. Mol Cell 85(9):1852-1867.e10 PMID: 40273917
- 3. Hüll K et al.. 2018. In Vivo Photopharmacology.. Chem Rev 118(21):10710-10747 PMID: 29985590
- 4. de Koning H et al.. 2000. Nucleobase transporters (review).. Mol Membr Biol 17(2):75-94 PMID: 10989458
- 5. Vishnu N et al.. 2024. ERMA (TMEM94) is a P-type ATPase transporter for Mg(2+) uptake in the endoplasmic reticulum.. Mol Cell 84(7):1321-1337.e11 PMID: 38513662
- 6. Abe T. 2014. [Innate immune DNA sensing pathways].. Uirusu 64(1):83-94 PMID: 25765984
- 7. Franchi-Gazzola R et al.. 2006. The role of the neutral amino acid transporter SNAT2 in cell volume regulation.. Acta Physiol (Oxf) 187(1-2):273-83 PMID: 16734764
- 8. Nguyen DH et al.. 2024. RNA therapeutics for diarrhea.. Prog Mol Biol Transl Sci 204:295-309 PMID: 38458741
