| 2020 |
Granzyme A (GZMA) from cytotoxic lymphocytes directly cleaves GSDMB, unleashing its pore-forming activity and triggering pyroptosis in target cells. NK cells and cytotoxic T lymphocytes kill GSDMB-positive cells through this mechanism. IFN-γ upregulates GSDMB expression and promotes pyroptosis. Introducing GZMA-cleavable GSDMB into mouse cancer cells promotes tumor clearance in vivo. |
In vitro cleavage assays, cell death assays, NK/CTL co-culture killing assays, mouse tumor models, IFN-γ treatment experiments |
Science |
High |
32299851
|
| 2023 |
Crystal structure of IpaH7.8-GSDMB complex reveals how the Shigella flexneri ubiquitin-ligase effector IpaH7.8 recognizes the GSDMB pore-forming domain and ubiquitinates it for proteasomal degradation. Full-length GSDMB crystal structure shows stronger autoinhibition than other gasdermins. Presence of exon 6 in GSDMB isoforms dictates pore-forming/pyroptotic activity. Cryo-EM structure of the 27-fold-symmetric GSDMB pore reveals conformational changes driving pore formation and an essential role for exon-6-derived elements in pore assembly. |
X-ray crystallography (IpaH7.8-GSDMB complex and full-length GSDMB), cryo-EM (GSDMB pore), biochemical ubiquitination assays, isoform pyroptosis assays, mutagenesis |
Nature |
High |
36991125
|
| 2021 |
The Shigella flexneri effector IpaH7.8 ubiquitinates GSDMB and targets it for 26S proteasome-dependent destruction, protecting Shigella from NK cell bactericidal killing. GSDMB exhibits direct microbiocidal activity through recognition of phospholipids found on Gram-negative bacterial membranes, killing bacteria directly rather than by lysing host cells. |
Co-immunoprecipitation, ubiquitination assays, proteasome inhibitor experiments, NK cell killing assays, bacterial membrane lipid-binding assays, GSDMB knockdown/overexpression |
Cell |
High |
34022140
|
| 2022 |
GSDMB promotes epithelial restitution and repair independent of pyroptosis in inflamed colonocytes. GSDMB-deficient epithelial cells show hyper-adhesiveness, enhanced formation of vinculin-based focal adhesions, and arrest in wound closure. This is dependent on PDGF-A-mediated FAK phosphorylation. Disease-associated GSDMB SNPs disrupt epithelial restitution/repair. |
GSDMB knockout/knockdown in epithelial cells and organoids, in vitro wound closure assays, transcriptome profiling, focal adhesion analysis, FAK phosphorylation assays, single-cell analysis |
Cell |
High |
35021065
|
| 2019 |
GSDMB directly binds the CARD domain of caspase-4, promoting caspase-4 activity, which is required for cleavage of GSDMD in non-canonical pyroptosis. Downregulation of GSDMB alleviates GSDMD cleavage and cell death; overexpression promotes GSDMD cleavage and LDH release. |
Co-immunoprecipitation (GSDMB-caspase-4 CARD domain binding), caspase activity assays, GSDMB knockdown/overexpression, LDH release assays, Western blot for GSDMD cleavage |
Journal of molecular cell biology |
Medium |
30321352
|
| 2016 |
GSDMB overexpression in primary human bronchial epithelium increases expression of TGF-β1 and 5-lipoxygenase (5-LO). GSDMB induces TGF-β1 expression via induction of 5-LO, as knockdown of 5-LO in GSDMB-overexpressing cells inhibited TGF-β1 expression. Transgenic mice expressing human GSDMB show spontaneous airway hyperresponsiveness and remodeling without inflammation. |
Overexpression in primary human bronchial epithelium, siRNA knockdown of 5-LO, transgenic mouse model (hGSDMBZp3-Cre), gene expression assays |
PNAS |
Medium |
27799535
|
| 2023 |
GSDMB splicing isoforms are functionally distinct: isoforms 3 and 4 (containing exon 6) cause pyroptosis after GZMA cleavage, while isoforms 1, 2, and 5 (lacking intact exon 6) do not. Non-cytotoxic GSDMB N-terminal fragments block pyroptosis caused by cytotoxic isoforms in a dominant-negative manner. Upon NK cell attack, different isoforms lead to distinct cell death modes (pyroptosis, mixed pyroptosis/apoptosis, or apoptosis only). |
Isoform expression and GZMA cleavage assays, NK cell killing assays, cell death phenotype analysis (pyroptosis vs apoptosis markers), dominant-negative experiments, structural analysis of belt motif |
Science immunology |
High |
37115914
|
| 2023 |
Exon 6 translation is essential for GSDMB-mediated pyroptosis; GSDMB isoforms lacking exon 6 (GSDMB1-2) cannot cause cancer cell death. GSDMB N-terminal constructs containing exon 6 provoke cell membrane lysis and concomitant mitochondrial damage. Specific residues within exon 6 and other N-terminal domain regions are important for GSDMB-triggered cell death and mitochondrial impairment. Neutrophil elastase and caspase cleavage of GSDMB produces short N-terminal fragments with no cytotoxic activity, suggesting these proteases act as inhibitory mechanisms of pyroptosis. |
Isoform expression and cell death assays, mutagenesis of specific residues, mitochondrial damage assays, protease cleavage assays (GZMA, neutrophil elastase, caspases), cell membrane lysis assays |
Cell death and differentiation |
High |
36899106
|
| 2023 |
Crystal structure of GSDMB in complex with IpaH7.8 identifies membrane engagement sites of GSDMB. Structural analysis reveals how IpaH7.8 interacts with GSDMB and ubiquitinates it. Two residues in the α1-α2 loop of mouse GSDMD make it invulnerable to IpaH7.8-mediated degradation (non-identical to human). |
X-ray crystallography (GSDMB-IpaH7.8 complex), biochemical ubiquitination assays, mutagenesis of α1-α2 loop residues, functional degradation assays |
Nature communications |
High |
36599845
|
| 2023 |
Caspase-7 cleaves GSDMB at the D91 site during apoptosis, generating a C-terminal fragment (92–417 aa) that binds back to the GSDMB N-terminus (1–91 aa) to block GSDMB's pro-pyroptotic function, thereby inhibiting non-canonical pyroptosis. The GSDMB N-domain (1–91 aa) is important for binding caspase-4 and promoting non-canonical pyroptosis. During bacterial infection (E. coli, S. Typhimurium) and in a septic mouse model, inhibition of caspase-7/GSDMB axis increased pyroptotic cell death. |
Caspase-7 cleavage assays, co-immunoprecipitation (GSDMB-C binding GSDMB-N, GSDMB binding caspase-4), cell death assays with bacterial infection models, caspase-7 inhibitor and knockout mouse experiments |
Cell death and differentiation |
Medium |
37591921
|
| 2021 |
GSDMB interacts with STAT3 to increase STAT3 phosphorylation and modulate glucose metabolism in bladder cancer cells. USP24 (a deubiquitinase) stabilizes GSDMB by preventing its degradation, activating downstream STAT3 signaling. This USP24/GSDMB/STAT3 axis promotes bladder cancer growth. |
Mass spectrometry and co-immunoprecipitation (GSDMB-STAT3 and GSDMB-USP24 interactions), GSDMB overexpression/knockdown, STAT3 phosphorylation assays, USP24 inhibitor treatment, xenograft tumor models |
International journal of biological sciences |
Medium |
34326684
|
| 2024 |
GSDMB interacts with the C-terminus of STING and promotes translocation of STING to the Golgi, leading to phosphorylation of IRF3 and induction of interferons and interferon-stimulated genes (ISGs) via the cGAS-STING pathway in bronchial epithelial cells. |
Co-immunoprecipitation (GSDMB-STING interaction), immunofluorescence (STING Golgi translocation), IRF3 phosphorylation assays, GSDMB overexpression and knockout in BEAS-2B and primary bronchial epithelial cells, qPCR/ELISA for IFN/ISG expression |
Journal of respiratory biology and translational medicine |
Medium |
38737375
|
| 2024 |
4-Octyl itaconate (4-OI) inhibits GSDMB-mediated pyroptosis by directly modifying Cys54, Cys148, and Ser212 on granzyme A (GZMA), thereby blocking GZMA-mediated cleavage of GSDMB rather than acting on GSDMB itself. |
Mass spectrometry-based identification of 4-OI modification sites on GZMA, GZMA cleavage assays, pyroptosis assays, transgenic mouse colitis model |
Cell proliferation |
Medium |
38982510
|
| 2024 |
GSDMB interacts with insulin-like growth factor 2 mRNA-binding protein 1 (IGF2BP1), which binds to and recognizes the 3'-UTR of DUSP6 mRNA, enhancing DUSP6 protein translation and inhibiting downstream ERK phosphorylation, thereby suppressing colorectal cancer cell proliferation. |
Co-immunoprecipitation (GSDMB-IGF2BP1), RNA-binding assays (IGF2BP1-DUSP6 3'-UTR), ERK phosphorylation assays, GSDMB transgenic mouse model, organoid experiments |
International immunopharmacology |
Medium |
39353395
|
| 2026 |
Human GZMA targets GSDMB via specific, high-affinity binding to the autoinhibitory GSDMB-C domain. GZMA dimerization is required for this interaction. A crystal structure of the GZMA-GSDMB-C complex shows 2:2 stoichiometry with an exosite at each of two symmetric dimer interfaces in GZMA; the exosite engages a two-loop-organized site in the GSDMB-C domain, enabling functional cleavage at Lys244. Mouse GZMA has a less efficient exosite; mutation of the mouse GZMA exosite enabled it to efficiently cleave and activate GSDMB. |
X-ray crystallography (GZMA-GSDMB-C complex), binding affinity measurements, GZMA dimerization analysis, mutagenesis of exosite residues, cleavage assays with mouse/human GZMA variants |
Immunity |
High |
41592574
|
| 2010 |
An Alu element in the 5' regulatory region upstream of GSDMB positively regulates GSDMB expression. A putative IKZF binding motif within this Alu element is crucial for upregulating GSDMB expression, as shown by reporter assays with intact, deleted, and mutated Alu elements. |
Reporter assays with intact, deleted, and mutated Alu element constructs; expression analysis in gastric cancer patient tissues |
Genes & genetic systems |
Medium |
20410667
|
| 2008 |
GSDMB (GSDML) protein is localized to the cytoplasm in most cell types, but shows a distinctive vesicular staining pattern in the apical region of gastric chief cells and colonic surface mucous cells, and the basal region of neuroendocrine cells, suggesting involvement in a secretory pathway. |
Immunohistochemistry and immunoblotting using anti-peptide antibodies developed against GSDML; in vitro transcription-translation for antibody specificity verification |
Pathology |
Low |
18038310
|
| 2008 |
GFP-GSDMB (GSDML1) fusion protein localizes predominantly to the nucleus in MCF7 and HeLa cells but exclusively to the cytoplasm in HepG2 cells, indicating cell-type-dependent subcellular localization. Ectopic expression of GSDMB1 enhanced cell growth, while inhibition of its endogenous expression decreased proliferation. |
GFP fusion protein live cell imaging, siRNA knockdown and overexpression, BrdU incorporation assay, MTT-equivalent proliferation assays |
Translational oncology |
Low |
18633457
|
| 2025 |
GATA1 binds to the promoter region of GSDMB and facilitates its expression. GSDMB overexpression upregulates mesenchymal markers and promotes epithelial-mesenchymal transition (EMT), as well as proliferation and migration in TGF-β1-treated bronchial epithelial cells. |
Chromatin immunoprecipitation (GATA1 binding to GSDMB promoter), GSDMB overexpression in Beas-2B cells with TGF-β1 treatment, EMT marker assays, proliferation and migration assays |
Molecular immunology |
Medium |
41092691
|