GO:0005521 lamin binding: Mechanism, Genes and Research Methods
Research-grade guide for scientists and biopharma professionals
Key Takeaways
• GO:0005521 lamin binding describes the molecular function of binding to lamin, any intermediate-filament protein forming the fibrous matrix on the inner surface of the nuclear envelope.
• Lamin-binding proteins (LBPs) are central to nuclear architecture, chromatin organization, and mechanotransduction.
• The lamin-binding interactome includes well-characterized proteins such as LAP2, emerin, MAN1, SUN1, SUN2, nesprin-1, nesprin-2, and BAF.
• Lamin binding is conserved across metazoans, with Caenorhabditis elegans providing a powerful genetic model for dissecting LBP function.
• Disrupted lamin binding underlies laminopathies, including muscular dystrophy, cardiomyopathy, and premature aging syndromes.
• CRISPR-based knockout, point-mutation, knock-in, and overexpression models enable causal testing of lamin-binding proteins in human cells.
Description
Lamin binding (GO:0005521) is a molecular function defined as binding to lamin, any of a group of intermediate-filament proteins that form the fibrous matrix on the inner surface of the nuclear envelope. Lamins are the major structural components of the nuclear lamina, a dense protein meshwork underlying the inner nuclear membrane, and they interact with a diverse set of lamin-binding proteins (LBPs) that mediate nuclear envelope integrity, chromatin tethering, and mechanosignaling. The functional importance of lamin binding is underscored by its evolutionary conservation and by the broad range of cellular processes it influences, from chromatin organization to nuclear positioning. Researchers study lamin binding to understand how the nuclear periphery regulates gene expression, genome stability, and cellular responses to mechanical force. Because mutations in lamins and LBPs cause human diseases collectively known as laminopathies, the lamin-binding interface is a compelling target for mechanistic and therapeutic investigation.
lamin binding At A Glance
| GO ID | GO:0005521 |
|---|---|
| GO term | lamin binding |
| Ontology | molecular_function |
| Synonym | lamin/chromatin binding |
| Definition | Binding to lamin; any of a group of intermediate-filament proteins that form the fibrous matrix on the inner surface of the nuclear envelope. |
| Major function | Anchoring proteins to the nuclear lamina and mediating chromatin organization, nuclear envelope integrity, and mechanotransduction. |
| Representative binders | LAP2, emerin, MAN1, SUN1, SUN2, nesprin-1, nesprin-2, BAF, lamin A/C, lamin B. |
| Conservation | Present across metazoans; extensively studied in C. elegans and human cells. |
| Disease relevance | Laminopathies including Emery-Dreifuss muscular dystrophy, dilated cardiomyopathy, and Hutchinson-Gilford progeria syndrome. |
What Is GO:0005521?
GO:0005521 lamin binding is the molecular function of selectively interacting with lamin proteins, which are intermediate-filament proteins that polymerize into the fibrous nuclear lamina on the inner surface of the nuclear envelope. This binding activity is exhibited by a wide array of nuclear envelope and chromatin-associated proteins, collectively termed lamin-binding proteins, and it serves to anchor them to the lamina or to modulate lamin assembly and function. The synonym lamin/chromatin binding reflects the frequent coupling of lamin binding with chromatin association, as many LBPs also bind DNA or histones.
Why Is lamin binding Important in Cell Biology?
Lamin binding is fundamental to nuclear architecture and genome function because it physically couples the nuclear lamina to chromatin, nuclear pore complexes, and the cytoskeleton. This coupling is essential for maintaining nuclear shape, organizing heterochromatin at the nuclear periphery, and transmitting mechanical signals from the cell surface to the nucleus. Defects in lamin-binding proteins disrupt these processes and cause a spectrum of human diseases, making lamin binding a critical area of biomedical research.
• Maintains nuclear envelope integrity and mechanical stability.
• Tethers chromatin to the nuclear periphery, influencing gene expression.
• Mediates mechanotransduction from the cytoskeleton to the nucleus.
• Coordinates nuclear positioning and genome folding.
• Mutations in lamin-binding proteins cause muscular dystrophies and cardiomyopathies.
• Implicated in premature aging syndromes such as Hutchinson-Gilford progeria.
• Provides a model for studying evolutionarily conserved nuclear organization.
• Serves as a target for CRISPR-based disease modeling and therapeutic screening.
Molecular Mechanism of lamin binding
Lamin polymerization and the nuclear lamina scaffold
In simple terms: Lamins first assemble into a mesh-like scaffold that other proteins can bind to.
Lamins are intermediate-filament proteins that assemble into higher-order polymers forming the nuclear lamina, a fibrous matrix on the inner surface of the nuclear envelope. This lamina provides the docking surface for lamin-binding proteins and is essential for nuclear envelope structure. The assembly state of lamins influences which partners can bind, as some LBPs preferentially associate with polymerized lamins.
Recognition and binding of lamin partners
In simple terms: Specific proteins recognize and attach to lamins through dedicated interaction domains.
Lamin-binding proteins contain defined domains, such as the LEM domain, that mediate binding to lamins and associated factors. For example, LAP2, emerin, and MAN1 bind lamin A/C and lamin B through their LEM domains and adjacent regions. The binding is selective and can be regulated by post-translational modifications and cell-cycle state.
Chromatin tethering at the nuclear periphery
In simple terms: Lamin-binding proteins also grab onto DNA and histones, pulling chromatin to the nuclear edge.
Many lamin-binding proteins simultaneously bind chromatin, either directly or through partners such as BAF, thereby tethering specific genomic regions to the nuclear lamina. This tethering contributes to the formation of lamina-associated domains (LADs) and influences transcriptional repression. The dual binding activity is reflected in the synonym lamin/chromatin binding.
Mechanical coupling via LINC complexes
In simple terms: Lamin-binding proteins connect the nucleus to the cytoskeleton, allowing forces to be transmitted.
SUN-domain proteins in the inner nuclear membrane bind lamins and interact with nesprins in the outer nuclear membrane to form LINC complexes. These complexes mechanically couple the nuclear lamina to the cytoskeleton, enabling force transmission and nuclear mechanotransduction. Disruption of this coupling leads to nuclear deformation and disease.
Regulation by post-translational modifications
In simple terms: Chemical tags on lamins or their partners can strengthen or weaken binding.
Phosphorylation, farnesylation, and proteolytic processing of lamins modulate their interactions with binding partners. For instance, the processing of prelamin A to mature lamin A affects its ability to bind partners, and defects in this pathway cause progeroid syndromes. These modifications provide dynamic control over lamin-binding interactions during the cell cycle and in response to stress.
Key Genes Involved in GO:0005521 lamin binding
The following genes encode proteins with demonstrated lamin-binding activity or that are core components of the lamin-binding machinery, based on published literature.
| Gene | Major Role | Research Relevance |
|---|---|---|
| LMNA | Encodes lamin A/C, a major intermediate filament protein of the nuclear lamina | Mutations cause laminopathies; central to lamin-binding studies |
| LMNB1 | Encodes lamin B1, a constitutive lamina component | Key binding partner; implicated in nuclear organization and disease |
| LMNB2 | Encodes lamin B2 | Less studied lamin; contributes to lamina structure |
| LAP2 (TMPO) | LEM-domain protein that binds lamin A/C and chromatin | Model for lamin-chromatin coupling |
| EMD | Emerin, inner nuclear membrane protein binding lamin A/C | Mutations cause Emery-Dreifuss muscular dystrophy |
| MAN1 (LEMD3) | LEM-domain protein binding lamin A and chromatin | Regulates TGF-beta signaling; disease relevance |
| SUN1 | Inner nuclear membrane protein binding lamins; LINC component | Mechanotransduction and nuclear positioning |
| SUN2 | Inner nuclear membrane protein binding lamins; LINC component | Nuclear envelope integrity |
| SYNE1 | Nesprin-1, outer nuclear membrane protein linking to cytoskeleton | Muscular dystrophy and mechanotransduction |
| SYNE2 | Nesprin-2, outer nuclear membrane protein | Nuclear positioning and disease |
| BAF (BANF1) | DNA-binding protein that bridges lamin partners to chromatin | Chromatin tethering and nuclear assembly |
| LBR | Lamin B receptor, binds lamin B and chromatin | Nuclear envelope and chromatin organization |
| NUP153 | Nuclear pore protein that interacts with lamins | Nuclear pore-lamina coupling |
| PRPF8 | Splicing factor with reported lamin-binding activity | Potential link to RNA processing |
| ZMPSTE24 | Protease processing prelamin A | Defects cause progeroid syndromes |
| LMNA variants | Disease-associated mutations in lamin A/C | Modeled by CRISPR for laminopathy research |
How Is lamin binding Regulated?
Lamin binding is regulated at multiple levels. Post-translational modifications of lamins, including phosphorylation and farnesylation, control their assembly state and partner accessibility. The processing of prelamin A by ZMPSTE24 is critical for generating mature lamin A capable of normal interactions, and its disruption leads to progeroid phenotypes. Cell-cycle-dependent phosphorylation of lamins during mitosis weakens lamin-binding interactions and promotes nuclear envelope disassembly. Additionally, mechanical cues from the cytoskeleton can modulate LINC complex formation and lamin binding, providing a feedback mechanism for mechanotransduction.
lamin binding and Human Disease
| Gene | Disease / Biology | Potential Experimental Model |
|---|---|---|
| LMNA | Emery-Dreifuss muscular dystrophy, dilated cardiomyopathy, progeria | CRISPR knock-in of patient mutations in iPSCs or HEK293 |
| EMD | Emery-Dreifuss muscular dystrophy | Knockout in muscle cell lines; rescue with wild-type emerin |
| ZMPSTE24 | Restrictive dermopathy, progeroid syndromes | Point mutation knock-in to model processing defects |
| SYNE1 | Autosomal recessive cerebellar ataxia, muscular dystrophy | Knockout in neuronal or muscle cells |
| LMNB1 | Adult-onset autosomal dominant leukodystrophy | Overexpression and knockout in oligodendrocyte models |
Laminopathies and muscular dystrophy
Mutations in LMNA and genes encoding lamin-binding proteins such as EMD cause Emery-Dreifuss muscular dystrophy and related disorders. These mutations disrupt lamin binding and nuclear envelope integrity, leading to muscle weakness and cardiac conduction defects. Research using patient-derived cells and CRISPR models has linked defective lamin binding to impaired mechanotransduction and gene regulation.
Premature aging syndromes
Hutchinson-Gilford progeria syndrome is caused by mutations that produce progerin, a permanently farnesylated form of prelamin A that alters lamin-binding interactions. Progerin accumulation disrupts the nuclear lamina and its associated proteins, leading to accelerated aging phenotypes. Lamin-binding partners are therefore studied as modifiers of progeroid disease.
Cancer and genome organization
Altered lamin binding and nuclear lamina organization are observed in cancer cells, where they contribute to genome instability and changes in gene expression. Lamin-binding proteins help position chromatin domains, and their disruption can lead to aberrant genome folding. These findings suggest that lamin-binding pathways may be relevant to cancer biology.
From lamin binding-Related Genes to Experimental Models
| Research Question | Suitable Model |
|---|---|
| Does loss of a candidate LBP disrupt nuclear envelope integrity? | CRISPR knockout in HEK293 or HeLa cells |
| Does a disease-associated point mutation alter lamin binding affinity? | Point-mutation knock-in in iPSCs or U2OS cells |
| Can a tagged LBP be used to map lamin interactions? | Knock-in of GFP or HA tag at endogenous locus |
| Does overexpression of a LBP rescue laminopathy phenotypes? | Doxycycline-inducible overexpression in patient fibroblasts |
| Which genomic regions are tethered by a specific LBP? | Knockout followed by DamID or ChIP-seq |
| Is a LBP required for mechanotransduction? | Knockout in mesenchymal stem cells under mechanical strain |
How to Study the lamin binding Process
| Method | What It Measures | Typical Application |
|---|---|---|
| AP-MS | Protein-protein interactions with lamin baits | Identifying novel lamin-binding proteins |
| BioID proximity labeling | Proteins in close proximity to lamin in live cells | Mapping dynamic lamin interactome |
| DamID | Genomic regions contacting the nuclear lamina | Defining lamina-associated domains |
| ChIP-seq | Chromatin binding sites of LBPs | Linking lamin binding to gene regulation |
| Super-resolution microscopy | Nanoscale localization of LBPs and lamins | Assessing nuclear envelope structure |
| Micropipette aspiration | Nuclear deformability and stiffness | Mechanotransduction studies |
| CRISPR knockout screening | Phenotypes of LBP loss | Identifying essential lamin-binding genes |
Proteomic mapping of lamin interactions
Affinity purification coupled with mass spectrometry (AP-MS) using lamin baits or proximity labeling (BioID) can identify lamin-binding proteins in living cells. These approaches have expanded the known lamin interactome and revealed dynamic interactions.
Imaging nuclear envelope and chromatin organization
Fluorescence microscopy, including super-resolution and live-cell imaging, visualizes the localization of lamin-binding proteins and their impact on nuclear shape and chromatin distribution. These methods are essential for assessing phenotypes caused by lamin-binding perturbations.
Genomic mapping of lamina-associated domains
DamID and ChIP-seq techniques map genomic regions that contact the nuclear lamina, revealing how lamin-binding proteins contribute to chromatin organization. Combining these with CRISPR knockouts allows causal testing of specific LBPs.
Mechanical assays for mechanotransduction
Micropipette aspiration, traction force microscopy, and stretchable substrates measure nuclear mechanics and mechanosignaling in cells with altered lamin binding. These assays link molecular interactions to cellular force responses.
How CRISPR Can Be Used to Study GO:0005521 lamin binding
Knockout
CRISPR knockout of genes encoding lamin-binding proteins enables loss-of-function studies to determine their roles in nuclear envelope integrity, chromatin organization, and mechanotransduction. For example, knocking out EMD or LMNA in human cell lines reveals consequences for nuclear shape and gene expression.
Point Mutation
Introducing disease-associated point mutations into endogenous lamin or LBP genes via CRISPR base editing or homology-directed repair allows precise modeling of laminopathies. Such models help distinguish pathogenic mutations from benign variants and test binding affinity changes.
Knock-in
Knock-in of epitope tags (e.g., GFP, HA) or fluorescent reporters at endogenous loci facilitates live-cell imaging and proteomic mapping of lamin-binding proteins without overexpression artifacts. This approach preserves native regulation and interaction stoichiometry.
Overexpression
CRISPR-mediated overexpression or inducible expression of lamin-binding proteins can rescue loss-of-function phenotypes or model gain-of-function diseases. Overexpression studies are useful for testing sufficiency of a LBP in maintaining nuclear architecture.
How EDITGENE Supports lamin binding Research
Researchers studying lamin binding-related genes often need to determine whether a candidate gene is causally involved in nuclear envelope function, chromatin organization, or disease phenotypes. EDITGENE provides comprehensive CRISPR-based services to generate precisely engineered cell models for such investigations.
Contact EDITGENE today to design your custom CRISPR model for lamin binding research.
Frequently Asked Questions About lamin binding
What is lamin binding?
Lamin binding (GO:0005521) is the molecular function of binding to lamin proteins, which are intermediate-filament proteins forming the fibrous nuclear lamina on the inner surface of the nuclear envelope.
What genes are involved in lamin binding?
Key genes include LMNA, LMNB1, LMNB2, EMD, TMPO (LAP2), LEMD3 (MAN1), SUN1, SUN2, SYNE1, SYNE2, and BANF1 (BAF), among others.
What is the GO term for lamin binding?
The Gene Ontology term is GO:0005521, with the official name lamin binding and synonym lamin/chromatin binding.
Why is lamin binding important?
It maintains nuclear envelope integrity, tethers chromatin, mediates mechanotransduction, and its disruption causes laminopathies such as muscular dystrophy and progeria.
What proteins bind to lamin A?
Proteins such as emerin, LAP2, MAN1, SUN1, SUN2, and BAF bind lamin A/C and contribute to nuclear envelope and chromatin functions.
How is lamin binding studied?
Common methods include AP-MS, BioID, DamID, ChIP-seq, super-resolution imaging, and mechanical assays, often combined with CRISPR knockouts.
What diseases are associated with lamin binding defects?
Laminopathies including Emery-Dreifuss muscular dystrophy, dilated cardiomyopathy, Hutchinson-Gilford progeria syndrome, and certain leukodystrophies.
Is lamin binding conserved in evolution?
Yes, lamin-binding proteins are conserved across metazoans, with C. elegans serving as a key genetic model.
What is the role of lamin binding in chromatin organization?
Lamin-binding proteins tether chromatin to the nuclear periphery, forming lamina-associated domains that influence gene expression.
Can CRISPR be used to study lamin binding?
Yes, CRISPR knockout, point mutation, knock-in, and overexpression models enable causal testing of lamin-binding proteins in human cells.
Conclusion
Lamin binding (GO:0005521) is a fundamental molecular function that anchors diverse proteins to the nuclear lamina, shaping nuclear architecture, chromatin organization, and mechanotransduction. Its evolutionary conservation and link to human laminopathies make it a rich area for mechanistic and translational research. Advances in CRISPR-based modeling and proteomic mapping continue to expand our understanding of the lamin-binding interactome and its roles in health and disease.
References
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- 3. Gotzmann J et al.. 1999. Lamins and lamin-binding proteins in functional chromatin organization.. Crit Rev Eukaryot Gene Expr 9(3-4):257-65 PMID: 10651242
- 4. Dobrzynska A et al.. 2016. Lamin-Binding Proteins in Caenorhabditis elegans.. Methods Enzymol 569:455-83 PMID: 26778571
- 5. Yuan J et al.. 1991. Binding of lamin A to polynucleosomes.. J Biol Chem 266(14):9211-5 PMID: 2026620
- 6. Wang B et al.. 2025. The molecular basis of lamin-specific chromatin interactions.. Nat Struct Mol Biol 32(10):1999-2011 PMID: 40750945
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- 8. Wang Z et al.. 2025. Nuclear-lamin-guided plastic positioning and folding of the human genome.. Cell Rep 44(11):116529 PMID: 41205174
