| 1998 |
Mouse GBP3 (mGBP3) is a 71-kDa guanylate-binding protein with intrinsic GTPase activity (Km 77 µM, Vmax 21 pmol/min/µg), binds agarose-immobilized guanine nucleotides (GTP, GDP, GMP), lacks the CAAX isoprenylation motif present in other GBPs, and localizes to the cytosol by immunofluorescence. Its transcript peaks transiently during erythroid progenitor cell differentiation. |
Baculovirus recombinant protein expression, GTPase activity assay, guanine nucleotide-agarose pulldown, immunofluorescence microscopy, Northern blot |
Biochimica et biophysica acta |
High |
9659399
|
| 1994 |
GBP3 was identified as a novel gene on human chromosome 1 with high sequence homology to GBP1 and GBP2, establishing it as a third member of the interferon-inducible GBP gene family. |
Genomic library cloning, hybrid rodent-human cell line chromosome mapping, sequence homology analysis |
Gene |
Medium |
7518790
|
| 2020 |
In IFN-γ-stimulated human cells, GBP3 governs caspase-4 activation on the surface of cytosol-invading Gram-negative bacteria. GBP1 initiates assembly of the GBP signaling platform on bacteria, GBP2 and GBP4 control caspase-4 recruitment, and GBP3 specifically controls caspase-4 activation, which is required for gasdermin-D cleavage, pyroptosis, and IL-18 processing. |
Genetic epistasis (GBP knockout/knockdown cells), bacterial infection assays, caspase-4 activation readout, gasdermin-D cleavage assay, IL-18 processing assay, immunofluorescence colocalization |
Nature immunology |
High |
32541830
|
| 2017 |
Human GBP1 recruits GBP3 (along with GBP2, GBP4, and GBP6) to the surface of cytosolic Gram-negative bacteria (Shigella flexneri and Burkholderia thailandensis) via GBP1's C-terminal triple-arginine motif, establishing GBP3 as a secondary recruiter dependent on GBP1 for bacterial targeting. |
Immunofluorescence colocalization, GBP1 triple-arginine mutant (loss-of-function), bacterial infection assays, siRNA knockdown |
mBio |
High |
29233899
|
| 2019 |
GBP3 is resistant to ubiquitination and proteasomal degradation by the Shigella E3 ligase IpaH9.8. Structural analysis revealed that differences in the Switch II and α3 helix regions of the GTPase domain between GBP1 and GBP3/GBP7 prevent IpaH9.8 LRR domain engagement, making GBP3 refractory to this bacterial immune evasion strategy. |
Crystal structure of GBP1–IpaH9.8 LRR complex, structure-guided sequence comparison, ubiquitination and degradation assays |
PLoS pathogens |
High |
31216343
|
| 2022 |
Mouse GBP3 (together with mouse GBP1) is specifically required for inflammasome activation during infection with the cytosolic bacterium Francisella novicida. A charged/hydrophobic region within the N-terminal domain of mouse GBP1 and GBP3 directly binds and kills F. novicida and Neisseria meningitidis but not other bacteria or mammalian cells, causing pathogen membrane rupture and release of intracellular content for inflammasome sensing. |
GBP1/GBP3 knockout macrophages, bacterial infection assays, direct bacterial killing assay, membrane rupture/permeability assay, domain mapping by mutagenesis |
Nature communications |
High |
35906252
|
| 2022 |
Human GBP3 physically interacts with STING via its N-terminal GTPase domain, stabilizing STING protein levels; this interaction promotes expression of p62/SQSTM1, NRF2, and MGMT, thereby enhancing DNA damage repair and conferring temozolomide resistance in glioblastoma cells. |
Co-immunoprecipitation, domain deletion constructs, RNA interference knockdown, murine glioblastoma xenograft model, western blot for STING/p62/NRF2/MGMT |
Oncogene |
Medium |
35780181
|
| 2017 |
GBP3 promotes glioma cell proliferation by inducing SQSTM1/p62 expression and activating ERK1/2; depletion of SQSTM1 abolished GBP3-driven ERK1/2 phosphorylation and cell growth, and MEK inhibition blocked GBP3-induced proliferation, placing GBP3 upstream of the SQSTM1–ERK1/2 axis. |
GBP3 overexpression and siRNA knockdown, ERK1/2 phosphorylation western blot, SQSTM1 siRNA epistasis, MEK inhibitor treatment, in vivo tumor xenograft |
Biochemical and biophysical research communications |
Medium |
29128363
|
| 2023 |
GBP3 is not recruited to Francisella novicida (unlike Shigella flexneri) in human macrophages, demonstrating that the repertoire of GBPs assembled on bacteria is pathogen-selective and depends on GBP-intrinsic features and specific bacterial factors. Multiple GBP1 mutagenesis experiments showed that GBP1 targeting to F. novicida requires cooperative engagement of multiple GBP1 domains, whereas targeting to S. flexneri is more permissive. |
Immunofluorescence colocalization in human macrophages, GBP1 mutagenesis panel, bacterial infection assays |
Pathogens and disease |
Medium |
37012222
|
| 2023 |
Shigella effector IpaH9.8 promotes shedding of fewer GBPs from Shigella, and in the absence of IpaH9.8, GBP1-dependent LPS release from intracytosolic bacteria is increased, enhancing cytosolic LPS availability for caspase-4 activation. GBP3 (along with other GBPs degraded by IpaH9.8) contributes to caspase-4 activation even in the absence of GBP1. |
IpaH9.8 and OspC3 bacterial mutants, GBP knockdown/knockout epithelial cells, cytosolic LPS quantification, caspase-4 activation assay, pyroptosis readout |
Proceedings of the National Academy of Sciences of the United States of America |
Medium |
37014865
|
| 2017 |
STING (but not cGAS) is required for GBP3 (GBPchr3 locus in mice) expression in macrophages during Brucella abortus infection; GBPchr3 knockout mice are more susceptible to Brucella infection, and siRNA-mediated knockdown reduces IL-1β secretion and caspase-1 activation, placing GBP3 downstream of the STING–IFN axis and upstream of inflammasome activation. |
STING/cGAS knockout macrophages, GBPchr3 knockout mice (in vivo infection), siRNA knockdown, IL-1β ELISA, caspase-1 activation assay |
Journal of immunology (Baltimore, Md. : 1950) |
Medium |
29203515
|
| 2025 |
STAT1 directly binds the GBP3 promoter and drives GBP3 transcription in vascular smooth muscle cells stimulated with IFN-γ. GBP3 protein in the cytoplasm physically interacts with STING, forming a STAT1–GBP3–STING positive feedback loop that amplifies inflammation, oxidative stress, and DNA damage in acute aortic dissection. |
ChIP-PCR (STAT1 binding to GBP3 promoter), co-immunoprecipitation (GBP3–STING interaction), ATAC-seq/RNA-seq, single-cell RNA sequencing, mouse AAD model with STAT1 inhibitor treatment |
Cellular signalling |
Medium |
40714274
|
| 2024 |
CRISPR genome-wide knockout screen identified GBP3 as a gene that limits lentiviral vector production; knockout of GBP3 in HEK293T cells increased lentiviral titer, and triple knockout of GBP3, BPIFC, and LDAH achieved ~8.33-fold increase in LV titer, demonstrating GBP3 restricts lentivirus packaging. |
CRISPR-Cas9 high-throughput screen, single and multi-gene knockout in HEK293T cells, lentiviral titer quantification |
The CRISPR journal |
Medium |
39387256
|
| 2024 |
Gbp3 knockdown in BV2 microglia reduces expression of NLRP3, caspase-1, and GSDMD (pyroptosis pathway proteins) and decreases inflammatory cytokines after oxygen-glucose deprivation; Gbp3 overexpression has the opposite effect, placing Gbp3 as a positive regulator of the NLRP3/GSDMD pyroptotic pathway in ischemic conditions. |
siRNA knockdown and plasmid overexpression in BV2 cells, OGD/R model, western blot for NLRP3/GSDMD/caspase-1, ELISA for inflammatory cytokines, rat tMCAO in vivo model |
International immunopharmacology |
Medium |
39721455
|
| 2023 |
Gbp3 overexpression in a lupus nephritis cell model inhibits cell proliferation and increases levels of inflammatory factors (IL-1β, TNF-α, IL-8) and pyroptosis-related proteins (GSDMD, caspase-1, NLRP3); siRNA knockdown produces the opposite effects, indicating Gbp3 positively regulates inflammation and pyroptosis in renal cells. |
siRNA knockdown and overexpression, CCK-8 proliferation assay, ELISA for cytokines, western blot for pyroptosis proteins, LN mouse model (pristane injection) |
Autoimmunity |
Low |
37621179
|