GO:0044613 nuclear pore central transport channel: Components, Assembly and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0044613 describes the central transport channel of the nuclear pore complex (NPC), a specialized substructure filled with FG-nucleoporins that mediates nucleocytoplasmic transport of RNAs, proteins and small molecules.
• The channel is not a passive pore: its FG-nucleoporin meshwork forms a selective barrier and provides docking sites for karyopherin transport receptors.
• Conformational dynamics of the central channel are increasingly resolved by structural biology, revealing how the channel dilates and constricts during cargo passage.
• Pathogens exploit the central channel: HIV capsid passage can crack the nuclear pore, and HIV-1 nuclear import depends on channel-associated nucleoporins [2,5].
• Dysfunction or mutation of central-channel nucleoporins is linked to neurological disease and is a target for antiviral and cancer research [2,5].
• CRISPR knockout, knock-in and overexpression models of FG-nucleoporins enable causal testing of channel function in transport, infection and disease.
Description
The nuclear pore central transport channel (GO:0044613) is the central substructure of the nuclear pore complex (NPC), the sole gateway for nucleocytoplasmic exchange in eukaryotic cells. It is defined as the region through which RNAs, proteins and small molecules transit, and it is filled with phenylalanine-glycine (FG)-repeat nucleoporins that create a selective permeability barrier and a series of binding sites for transport receptors [1,3]. Because essentially all nuclear import and export must pass through this channel, its composition and dynamics are central to gene expression, cell cycle control and viral infection. Recent work has begun to resolve how the channel changes shape during cargo transit, showing that it is a highly dynamic, regulated structure rather than a static pore. Karyopherins, the transport receptors that ferry cargo, actively remodel the organization of the transport barrier, indicating that the channel is tuned to the cell's transport demands. Pathogens such as HIV-1 also engage the channel directly, and capsid passage can physically crack the nuclear pore, highlighting the channel as a point of vulnerability and therapeutic interest [2,5]. For researchers, GO:0044613 provides a precise annotation target for studying nucleoporin function, transport selectivity and disease mechanisms.
nuclear pore central transport channel At A Glance
| GO ID | GO:0044613 |
|---|---|
| GO term | nuclear pore central transport channel |
| Ontology | cellular_component |
| Synonym | karyopherin docking complex; nuclear pore central channel; nuclear pore central plug; nuclear pore transport channel |
| Major function | Mediates nucleocytoplasmic transport of RNAs, proteins and small molecules; forms a selective FG-nucleoporin barrier and docking site for transport receptors |
| Characterized yeast FG-nucleoporins | Nup159p, Nup145Np, Nup116p, Nup100p, Nsp1p, Nup57p, Nup49p, Nup42p, Nup53p, Nup59p/Asm4p, Nup60p, Nup1 |
| Characterized vertebrate FG-nucleoporins | Nup214, Nup98, Nup62, Nup54, Nup58/45, NLP1, Nup153 |
| Related transport receptors | Karyopherins (importins/exportins) that dock at FG-repeat sites and remodel the barrier |
| Dynamic property | Conformational changes during cargo passage; channel dilation and constriction |
What Is GO:0044613?
In our own words, GO:0044613 refers to the central substructure of the nuclear pore complex through which nucleocytoplasmic transport of RNAs, proteins and small molecules occurs. This channel is filled with FG-nucleoporins that form a selective barrier and provide binding sites for transporter proteins. In S. cerevisiae, characterized FG-nucleoporins include Nup159p, Nup145Np, Nup116p, Nup100p, Nsp1p, Nup57p, Nup49p, Nup42p, Nup53p, Nup59p/Asm4p, Nup60p and Nup1. In vertebrates, characterized FG-nucleoporins include Nup214, Nup98, Nup62, Nup54, Nup58/45, NLP1 and Nup153.
Why Is nuclear pore central transport channel Important in Cell Biology?
The nuclear pore central transport channel is essential because it controls all nucleocytoplasmic trafficking, thereby regulating gene expression, cell cycle progression, and antiviral responses. Its FG-nucleoporin barrier determines which molecules can enter or leave the nucleus, and its dynamic remodeling by karyopherins adjusts transport capacity to cellular state [1,3]. Because pathogens such as HIV-1 exploit the channel for nuclear entry, and because nucleoporin mutations are linked to neurological disease, the channel is a high-value target for both basic and translational research [2,5].
• Controls all nucleocytoplasmic transport, including mRNA export and protein import, which are fundamental to gene expression.
• FG-nucleoporins form a selective barrier that excludes non-transported macromolecules while allowing receptor-mediated cargo passage.
• Karyopherins dynamically remodel the transport barrier, linking transport to cellular signaling and stress.
• HIV-1 capsid passage can crack the nuclear pore, revealing a physical mechanism of viral nuclear entry.
• HIV-1 nuclear import depends on central-channel nucleoporins, making them potential antiviral targets.
• Nucleoporin dysfunction is implicated in neurological disease and developmental disorders.
• The channel is a model system for studying intrinsically disordered protein assemblies and phase separation.
• CRISPR screens targeting nucleoporins can identify host factors for viral infection and cancer.
• Structural dynamics of the channel inform drug design for transport inhibitors.
• Understanding the channel aids interpretation of nuclear transport in stem cells and differentiation.
Structure and Composition of nuclear pore central transport channel
FG-nucleoporin meshwork
In simple terms: The channel is filled with a mesh of proteins that act like a selective sieve.
The central transport channel is filled with FG-nucleoporins, which are proteins containing phenylalanine-glycine repeats. These FG repeats form a cohesive meshwork that creates a selective permeability barrier and provides binding sites for transport receptors. In vertebrates, characterized FG-nucleoporins include Nup214, Nup98, Nup62, Nup54, Nup58/45, NLP1 and Nup153; in S. cerevisiae, they include Nup159p, Nup145Np, Nup116p, Nup100p, Nsp1p, Nup57p, Nup49p, Nup42p, Nup53p, Nup59p/Asm4p, Nup60p and Nup1.
Karyopherin docking sites
In simple terms: Transport receptors dock onto the mesh to carry cargo through.
The FG-repeat meshwork provides a series of binding sites for karyopherins (importins and exportins). Karyopherins bind FG repeats, which allows them to traverse the channel with cargo. Recent work shows that karyopherins actively remodel the dynamic organization of the transport barrier, indicating that the channel is not static but adapts to transport demand.
Conformational dynamics
In simple terms: The channel changes shape as cargo moves through.
The central channel undergoes conformational changes during cargo passage. Structural studies reveal that the channel can dilate and constrict, and these dynamics are essential for efficient transport. The dynamic organization of the barrier is influenced by karyopherin binding, which can alter FG-nucleoporin interactions.
Pathogen interactions
In simple terms: Viruses can physically disrupt the channel to enter the nucleus.
HIV-1 capsid passage through the nuclear pore can crack the pore, indicating that the central channel is a site of physical stress during viral infection. HIV-1 nuclear import requires interactions with nucleoporins, and the central channel is a key interface for viral entry.
Key Genes Involved in GO:0044613 nuclear pore central transport channel
The following genes encode FG-nucleoporins and associated factors that localize to or function in the nuclear pore central transport channel.
| Gene | Major Role | Research Relevance |
|---|---|---|
| NUP214 | Vertebrate FG-nucleoporin; component of central channel | Implicated in leukemia; target for transport studies |
| NUP98 | Vertebrate FG-nucleoporin; central channel | Fusion proteins in leukemia; nuclear import research |
| NUP62 | Vertebrate FG-nucleoporin; central channel | Core component; studied in transport and infection |
| NUP54 | Vertebrate FG-nucleoporin; central channel | Structural component; dynamics studies |
| NUP58 | Vertebrate FG-nucleoporin; central channel | Also known as Nup58/45; involved in channel gating |
| NLP1 | Vertebrate FG-nucleoporin; central channel | Less characterized; potential transport role |
| NUP153 | Vertebrate FG-nucleoporin; nuclear basket and central channel | HIV-1 integration and transport |
| NUP159 | Yeast FG-nucleoporin; central channel | mRNA export studies |
| NUP145 | Yeast FG-nucleoporin; central channel | Nup145Np fragment; transport research |
| NUP116 | Yeast FG-nucleoporin; central channel | mRNA export and NPC assembly |
| NUP100 | Yeast FG-nucleoporin; central channel | Transport and NPC integrity |
| NSP1 | Yeast FG-nucleoporin; central channel | Essential for NPC function |
| NUP57 | Yeast FG-nucleoporin; central channel | Core channel component |
| NUP49 | Yeast FG-nucleoporin; central channel | mRNA export |
| NUP42 | Yeast FG-nucleoporin; central channel | Transport studies |
| NUP53 | Yeast FG-nucleoporin; central channel | NPC assembly |
| NUP59 | Yeast FG-nucleoporin; central channel | Also known as Asm4p; transport |
| NUP60 | Yeast FG-nucleoporin; central channel | Nuclear basket and transport |
| NUP1 | Yeast FG-nucleoporin; central channel | mRNA export |
How Is nuclear pore central transport channel Regulated?
The nuclear pore central transport channel is regulated by karyopherin availability and cargo load. Karyopherins remodel the dynamic organization of the transport barrier, meaning that changes in importin/exportin levels can alter channel permeability and selectivity. Conformational dynamics of the channel are also regulated by interactions with FG-nucleoporins and possibly by post-translational modifications, though specific pathways remain under investigation. Viral infection can perturb channel integrity, as HIV-1 capsid passage can crack the nuclear pore, indicating that the channel is subject to physical regulation during infection.
nuclear pore central transport channel and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| NUP153 | HIV-1 nuclear import and integration | Knockout in T cells or macrophages |
| NUP98 | Leukemia (fusion proteins) | Knock-in of fusion in hematopoietic cells |
| NUP214 | Leukemia | Overexpression of fusion in cell lines |
| NUP62 | Viral infection and transport | Knockout in epithelial cells |
| NUP54 | Transport dysfunction | Point mutation in channel domain |
HIV-1 infection and nuclear import
HIV-1 must enter the nucleus to integrate into the host genome. The virus engages the nuclear pore central transport channel, and capsid passage can crack the nuclear pore, revealing a physical mechanism of entry. HIV-1 nuclear import depends on interactions with nucleoporins, making the central channel a target for antiviral strategies.
Neurological disease and nucleoporin dysfunction
Mutations in nucleoporins have been linked to neurological disease, although the specific mechanisms are still being defined. The central channel's role in transport means that its dysfunction can disrupt neuronal gene expression and homeostasis.
Cancer and nucleoporin fusions
Nucleoporins such as NUP98 and NUP214 are involved in chromosomal translocations in leukemia. These fusions can alter nuclear transport and gene regulation, highlighting the central channel's relevance to cancer biology.
From nuclear pore central transport channel-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of an FG-nucleoporin impair nuclear import? | CRISPR knockout cell line |
| Does a point mutation in an FG-repeat alter channel selectivity? | Point-mutation knock-in |
| How does a nucleoporin fusion affect transport? | Knock-in of fusion gene |
| Where does a nucleoporin localize in the channel? | Tagged knock-in (e.g., GFP) |
| Does overexpression of a nucleoporin remodel the barrier? | Overexpression cell line |
| Can a virus enter the nucleus without a specific nucleoporin? | Knockout plus infection assay [2,5] |
How to Study the nuclear pore central transport channel Process
| Method | What It Measures | Typical Application |
|---|---|---|
| Cryo-electron tomography | 3D structure of the central channel | Conformational dynamics |
| Single-molecule FRET | FG-nucleoporin conformational changes | Barrier dynamics |
| Fluorescent cargo import assay | Nuclear import rate | Karyopherin function |
| Affinity purification-mass spectrometry | Protein interactions | Nucleoporin interactome |
| Proximity labeling | Spatial interactome | Channel composition |
| Pseudotyped HIV-1 infection | Nuclear entry efficiency | Host factor requirement [2,5] |
| CRISPR knockout screen | Genes required for transport | Host factor discovery |
| Live-cell imaging | Channel dynamics in real time | Cargo passage |
Structural biology and dynamics
Conformational dynamics of the central channel can be studied using cryo-electron tomography, single-molecule FRET, and molecular dynamics simulations. These approaches reveal how the channel dilates and constricts during cargo passage.
Transport assays
Nuclear import and export can be measured using fluorescent cargo microinjection, permeabilized cell assays, and live-cell imaging. Karyopherin-dependent remodeling of the barrier can be assessed by tracking cargo flux after altering karyopherin levels.
Proteomics and interactomics
Affinity purification coupled to mass spectrometry can identify FG-nucleoporin interaction partners and post-translational modifications. Proximity labeling can map the channel's dynamic interactome.
Infection models
HIV-1 nuclear import can be studied using pseudotyped viruses, capsid mutants, and CRISPR knockout cells lacking specific nucleoporins. Capsid passage and pore cracking can be visualized by electron microscopy [2,5].
How CRISPR Can Be Used to Study GO:0044613 nuclear pore central transport channel
Knockout
CRISPR knockout of FG-nucleoporin genes (e.g., NUP62, NUP98, NUP153) can be used to test their requirement for nuclear import, mRNA export, and viral infection. Knockout cell lines are valuable for identifying which nucleoporins are essential for channel function.
Point Mutation
Point mutations in FG-repeat domains can be introduced to dissect the role of specific phenylalanine-glycine motifs in barrier formation and karyopherin binding. Such models help determine how single amino acid changes alter channel selectivity.
Knock-in
Knock-in of tagged nucleoporins (e.g., GFP or HaloTag) allows live-cell imaging of channel dynamics and localization. Knock-in of disease-associated fusions (e.g., NUP98 fusions) can model leukemia-associated transport defects.
Overexpression
Overexpression of FG-nucleoporins can be used to test whether excess channel components remodel the transport barrier or alter karyopherin dynamics. This approach is useful for studying gain-of-function effects in cancer and infection.
How EDITGENE Supports nuclear pore central transport channel Research
Researchers studying nuclear pore central transport channel-related genes often need to determine whether a candidate gene is causally involved in transport, infection, or disease. EDITGENE provides CRISPR-based cell models and screening services to enable such causal experiments.
Contact EDITGENE today to design your custom CRISPR model for nuclear pore central transport channel research.
Related Products
| Product name | Cat.No. | Species | Gene ID | |
|---|---|---|---|---|
| NUP35 Knockout HEK293 Cell Line | EDJ-KQ9214 | Human | 129401 | Details Get a Quote |
| NXT2 Knockout HEK293 Cell Line | EDJ-KQ14536 | Human | 55916 | Details Get a Quote |
| NXT2 Knockout A-549 Cell Line | EDJ-KQ44817 | Human | 55916 | Details Get a Quote |
| NXT2 Knockout HeLa Cell Line | EDJ-KQ44819 | Human | 55916 | Details Get a Quote |
| NUP35 Knockout HCT 116 Cell Line | EDJ-KQ35778 | Human | 129401 | Details Get a Quote |
| NUP35 Knockout HeLa Cell Line | EDJ-KQ35779 | Human | 129401 | Details Get a Quote |
| NXT2 Knockout HCT 116 Cell Line | EDJ-KQ43566 | Human | 55916 | Details Get a Quote |
| NUP54 Knockout HEK293 Cell Line | EDJ-KQ51350 | Human | 53371 | Details Get a Quote |
| NUP54 Knockout HeLa Cell Line | EDJ-KQ56373 | Human | 53371 | Details Get a Quote |
| NUP54 Knockout A-549 Cell Line | EDJ-KQ64865 | Human | 53371 | Details Get a Quote |
| NUP35 Knockout A-549 Cell Line | EDJ-KQ66748 | Human | 129401 | Details Get a Quote |
| NUP54 Knockout HCT 116 Cell Line | EDJ-KQ73309 | Human | 53371 | Details Get a Quote |
Frequently Asked Questions About nuclear pore central transport channel
What is the nuclear pore central transport channel?
It is the central substructure of the nuclear pore complex through which RNAs, proteins and small molecules are transported, filled with FG-nucleoporins that form a selective barrier.
What genes are involved in the nuclear pore central transport channel?
Key genes include NUP214, NUP98, NUP62, NUP54, NUP58, NLP1, NUP153 in vertebrates, and NUP159, NUP145, NUP116, NUP100, NSP1, NUP57, NUP49, NUP42, NUP53, NUP59, NUP60, NUP1 in yeast.
What is GO:0044613?
GO:0044613 is the Gene Ontology identifier for the nuclear pore central transport channel, a cellular component.
How does the nuclear pore central transport channel work?
FG-nucleoporins form a meshwork that binds karyopherins, allowing receptor-cargo complexes to pass while excluding non-transported molecules; the channel dynamically changes shape during transport [1,3].
What is the role of FG-nucleoporins?
FG-nucleoporins create a selective permeability barrier and provide docking sites for transport receptors.
How do karyopherins interact with the central channel?
Karyopherins bind FG repeats and actively remodel the dynamic organization of the transport barrier.
Can viruses exploit the nuclear pore central transport channel?
Yes, HIV-1 capsid passage can crack the nuclear pore, and HIV-1 nuclear import depends on nucleoporins [2,5].
What diseases are linked to nuclear pore central transport channel dysfunction?
Nucleoporin mutations are linked to neurological disease, and NUP98/NUP214 fusions are associated with leukemia [1,2].
How can I study the nuclear pore central transport channel?
Use structural biology, transport assays, proteomics, and CRISPR knockout/knock-in models [1,3].
What CRISPR models are available for nuclear pore central transport channel research?
EDITGENE offers knockout, point mutation, knock-in, overexpression cell models and CRISPR library screening for nucleoporin genes.
Conclusion
The nuclear pore central transport channel (GO:0044613) is a dynamic, FG-nucleoporin-rich substructure that governs all nucleocytoplasmic trafficking. Its conformational dynamics, regulation by karyopherins, and exploitation by viruses make it a central topic in cell biology and infectious disease research [1,2,3,5]. CRISPR-based models are powerful tools to dissect its function and to identify therapeutic targets.
References
- 1. Chen Y et al.. 2025. Conformational dynamics of the nuclear pore complex central channel.. Biochem Soc Trans 53(1) PMID: 39927798
- 2. Kreysing JP et al.. 2025. Passage of the HIV capsid cracks the nuclear pore.. Cell 188(4):930-943.e21 PMID: 39826544
- 3. Kozai T et al.. 2025. Karyopherins remodel the dynamic organization of the nuclear pore complex transport barrier.. Nat Cell Biol 27(12):2089-2101 PMID: 41331088
- 5. Shen Q et al.. 2021. Nuclear Import of HIV-1.. Viruses 13(11) PMID: 34835048
