| 1996 |
Yeast Nup188p was identified as a major constituent of the NPC, localizing to both cytoplasmic and nucleoplasmic faces of the NPC core. It physically interacts with the pore membrane protein Pom152p and the nucleoporin Nic96p. Null mutants appear normal, but certain dominant alleles cause NPC-associated nuclear envelope herniations and growth inhibition at 37°C. Depletion of Pom152p in nup188 null cells causes severe nuclear envelope deformations, establishing Nup188p as part of the octagonal core structure involved in NPC structural organization. |
Immunoelectron microscopy, immunofluorescence, co-fractionation with isolated NPCs, genetic interaction analysis (synthetic lethality), dominant allele phenotypic analysis |
The Journal of cell biology |
High |
8682855
|
| 1996 |
The C-terminal domain of Nic96p functionally interacts with Nup188p in an allele-specific fashion; affinity purification of ProtA-Nup188p co-precipitated a fraction of Nic96p, establishing a physical interaction. Thermosensitive Nic96p mutations in its central domain inhibit NPC formation, and null mutants of NUP188 exhibit striking abnormalities in nuclear envelope and NPC morphology, placing Nup188p in the Nic96p-anchored structural network of the NPC. |
Allele-specific genetic interaction analysis, affinity purification (ProtA-Nup188p), electron microscopy of nuclear envelope morphology |
The Journal of cell biology |
High |
8682854
|
| 1995 |
Genetic interaction screens in yeast revealed that deletion of NUP188 alone is not lethal, but pairwise deletion combinations with POM152 or NUP170 are synthetically lethal, and NUP188 was identified as a major component comprising over one-fifth of the mass of the isolated yeast NPC together with Nup170p, Nup157p, Pom152p, and Nic96p. |
Synthetic lethal screen, direct microsequencing of NPC-enriched fractions, genetic complementation analysis |
The Journal of cell biology |
High |
8522578
|
| 2000 |
Deletion of NUP188 (nup188-Δ) in yeast significantly increases passive nuclear envelope permeability: passive export rates of NLS-GFP reporters are faster, and equilibrium sieving limits for the NPC diffusion channel are larger than wild-type. This establishes Nup188p (together with Nup170p) as a determinant of the functional resting diameter of the NPC's central transport channel. |
In vivo fluorescence microscopy using NLS-GFP and NES-GFP reporters of varying sizes in nup188-Δ cells, passive diffusion measurements |
The Journal of cell biology |
High |
10831607
|
| 1999 |
Elevated levels of Ssa1p (but not Ssb1p) suppress the NLS-GFP nuclear localization defects of nup188-Δ cells, placing Nup188p functionally upstream of Hsp70-assisted NLS-directed import. The differential suppression mapped to the nuclear export signal (NES) of Ssb1p, not to ATPase or peptide-binding domain differences, demonstrating a specific functional connection between Nup188p and cytosolic Hsp70 in nuclear transport. |
Genetic suppression analysis in nup188-Δ yeast, GFP reporter localization, chimeric Hsp70 constructs |
The Journal of biological chemistry |
Medium |
10347213
|
| 1997 |
N-Nup145p (the GLFG-containing N-terminal cleavage product of Nup145p) becomes essential in a nup188 mutant background, demonstrating a synthetic lethal genetic interaction. Generation of the free N-domain by in vivo cleavage is required to complement this interaction, placing Nup188p in a functional network with GLFG-nucleoporins at the NPC. |
Synthetic lethality analysis in nup188 mutant background, domain complementation assays |
The EMBO journal |
Medium |
9305650
|
| 2000 |
Vertebrate Nup188 was identified using an organelle trap assay in Xenopus egg extracts. Xenopus Nup188 exists in a stable complex with xNup93 and xNup205, does not bind WGA directly but associates indirectly via N-acetylglucosamine-modified nucleoporins, and can assemble into annulate lamellae (a cytoplasmic NPC mimic). Human NUP188 was also identified as an ortholog. |
Organelle trap assay (affinity selection on WGA-Sepharose + in vitro annulate lamellae assembly), co-immunoprecipitation, biotinylation tagging |
Molecular biology of the cell |
High |
11029043
|
| 2013 |
Crystal structure of yeast Nup188 was determined, revealing an extended stack of helices where the N-terminal ~130 kDa segment forms an intricate closed ring and the C-terminal region is a superhelical structure with distant similarity to S-shaped nuclear transport receptors (NTRs). Both Nup188 and Nup192 specifically bind FG-repeats and can translocate through NPCs by facilitated diffusion, blurring the distinction between stationary scaffold nucleoporins and soluble NTRs. |
X-ray crystallography (structure determination), FG-repeat binding assays, in vivo NPC translocation assays |
eLife |
High |
23795296
|
| 2013 |
Human Nup188 localizes to spindle poles during mitosis through its C-terminal region. Depletion of Nup188 causes failure of chromosome alignment at the metaphase plate, mitotic arrest via the spindle assembly checkpoint, and loss of robust K-fiber formation. Nup188 physically interacts with NuMA, and NuMA localization to spindle poles is perturbed in Nup188-depleted cells, establishing a mitotic function for Nup188 in chromosome segregation via K-fiber formation and NuMA recruitment. |
RNAi knockdown with live-cell imaging, immunofluorescence for spindle pole localization, co-immunoprecipitation (Nup188-NuMA interaction), spindle assembly checkpoint analysis |
Cancer science |
High |
23551833
|
| 2016 |
Nup188 (together with Nup205) assists Nup93 in mediating repression of the HOXA gene cluster at the nuclear periphery. Depletion of the Nup93 sub-complex (Nup93/Nup188/Nup205) significantly upregulates HOXA gene expression, disengages the HOXA locus from the nuclear periphery (by 3D-FISH), increases active histone marks (H3K9ac), decreases repressive marks (H3K27me3), and increases transcription elongation marks (H3K36me3) on HOXA1. |
siRNA knockdown, ChIP, 3D-FISH, histone mark analysis by ChIP, RT-qPCR for gene expression |
Epigenetics & chromatin |
Medium |
27980680
|
| 2017 |
GLFG repeats of Nup116 function redundantly with Nup188, a nonessential scaffold nucleoporin, to stabilize critical interactions within the NPC scaffold needed for late steps of NPC assembly. Direct in vitro binding between GLFG-containing FG repeats and multiple scaffold Nups including Nup188 was demonstrated, revealing a structural 'Velcro' role for natively unfolded FG repeats in linking NPC subcomplexes. |
In vitro binding assays (FG-repeat/scaffold interaction), genetic epistasis (nup116Δ nup188 double mutants), in vivo NPC assembly assays |
Cell |
High |
29033133
|
| 2018 |
In budding yeast, Brl1 interacts with Nup188 by co-immunoprecipitation and with NPC components by split-YFP analysis. Brr6/Brl1 associate transiently with NPC assembly sites and promote NPC biogenesis; depletion causes NPC biogenesis defects while assembled NPCs remain intact, placing Nup188 within the Brl1-dependent NPC assembly pathway. |
Co-immunoprecipitation, split-YFP interaction analysis, conditional degron depletion, fluorescence microscopy of NPC assembly |
The Journal of cell biology |
Medium |
29439116
|
| 2018 |
Quantitative fluorescence microscopy (NuRIM) revealed that Nup188 and its paralog Nup192 form a paralog pair whose altered expression leads to significant changes in NPC stoichiometry: overexpression of one leads to substitution for the other, revealing compositional plasticity at the NPC inner ring. |
Quantitative fluorescence microscopy (NuRIM), genetic manipulation of Nup188/Nup192 expression levels |
Proceedings of the National Academy of Sciences of the United States of America |
Medium |
29632211
|
| 2019 |
TDP-43 controls mRNA splicing of NUP188; complete knockout of TDP-43 in human cells results in aberrant Nup188 mRNA splicing, and this is accompanied by nuclear envelope morphological defects, establishing TDP-43 as a trans-acting splicing regulator of NUP188. |
TDP-43 knockout cell lines, transcriptomic analysis, RT-PCR validation of splicing defects, cell biological analysis of nuclear envelope morphology |
Life science alliance |
Medium |
31527135
|
| 2020 |
Nup188 populates centrosomes (pericentriolar material, PCM) with newly synthesized protein that does not exchange with NPCs even after mitotic NPC breakdown. The PCM pool is subject to proteasomal degradation while the NPC pool is not, establishing differential turnover as a mechanism segregating Nup188 between the two compartments. Nup188 directly binds Cep152 and functions in centriole duplication at or upstream of Sas6 loading, linking its centrosomal role to congenital heart disease mechanisms. |
Pulse-chase fluorescent labeling, proximity-labeling (BioID), super-resolution microscopy, proteasome inhibitor experiments, direct binding assay (Nup188-Cep152), Nup188 depletion with Sas6 loading assay |
The Journal of cell biology |
High |
32211895
|
| 2022 |
Cryo-EM and crystal structures of intact Nup188 (and Nup192) scaffold hubs bound to linker nucleoporin binding regions (Nic96, Nup145N, Nup53) were determined, revealing Nup188 as a question mark-shaped keystone of two evolutionarily conserved hetero-octameric inner ring complexes. Linkers bind to scaffold surface pockets through short defined motifs. Quantitative docking into cryo-ET maps of constricted and dilated NPCs positioned Nup188 in the intact fungal and human NPC and revealed that the linker-scaffold network allows inner ring constriction/dilation while outer ring spokes are cross-link stapled and restricted from dilation. |
Single-particle cryo-EM, X-ray crystallography, biochemical reconstitution, cryo-ET docking, structure-guided mutagenesis in S. cerevisiae |
Science (New York, N.Y.) |
High |
35679425
|
| 2022 |
NUP188 was identified as a Nesprin-2-interacting partner of the LINC complex at the nuclear envelope. Cytosol-localized SV40 polyomavirus is targeted to the nuclear envelope via Nesprin-2, which positions NUP188/NPC to capture the virus and facilitate nuclear translocation. This defines NUP188 as a physical bridge between the LINC complex and NPC for cargo handoff. |
Co-immunoprecipitation (Nesprin-2/NUP188 interaction), siRNA knockdown with viral infection assays, fluorescence microscopy tracking of SV40 nuclear entry |
PLoS pathogens |
Medium |
36067270
|
| 2011 |
Morpholino knockdown of NUP188 in Xenopus strongly disrupts both morphological left-right (LR) development and expression of pitx2, a molecular marker of LR patterning, identifying NUP188 as a gene required for LR body patterning, likely through a cilia-related mechanism at the gastrocoel roof plate LR organizer. |
Morpholino knockdown in Xenopus, in situ hybridization for pitx2 expression, morphological scoring of LR defects |
Proceedings of the National Academy of Sciences of the United States of America |
Medium |
21282601
|
| 2018 |
A cold-sensitive nup188-brr7 allele causes defects in select protein import pathways as well as mRNA export in S. cerevisiae, linking Nup188 function specifically to nucleocytoplasmic transport through the Nic96 nucleoporin complex. |
Genetic screen (cold-sensitive mRNA export), dT50 in situ hybridization for poly-A RNA export, protein import assays in nup188 mutant |
G3 (Bethesda, Md.) |
Medium |
30021831
|
| 2025 |
A genome-wide screen in yeast identified Nup188 as required for break-induced replication (BIR) completion, acting later than Nup84. Nup188 functions after DNA synthesis to support BIR repair completion, placing it sequentially in the BIR pathway distinct from its NPC structural role. |
Genome-wide genetic screen for BIR deficiency, validation by epistasis analysis of nup188 deletion in BIR assay |
Nature communications |
Medium |
41398407
|
| 1999 |
Full-length Pom152p (including its lumenal C-terminal domain) is required to rescue nup188 mutations, while the N-terminal domain alone can rescue nic96 and nup59 mutants, demonstrating that Nup188p's functional interaction with Pom152p requires the lumenal structures of Pom152p and implicating the pore membrane-to-scaffold connection in NUP188 function. |
Domain complementation assays of Pom152p in nup188 and other nup mutant backgrounds, topology mapping by alkaline extraction and protease protection |
The Journal of biological chemistry |
Medium |
9988776
|