| 2004 |
BAG5 directly interacts with parkin and Hsp70. Within this complex, BAG5 inhibits parkin E3 ubiquitin ligase activity and Hsp70-mediated refolding of misfolded proteins. BAG5 enhances parkin sequestration within protein aggregates and mitigates parkin-dependent preservation of proteasome function, enhancing dopamine neuron death in an in vivo PD model. |
Co-immunoprecipitation, in vitro ubiquitin ligase assay, in vivo dopamine neuron loss model, dominant-negative BAG5 mutant rescue |
Neuron |
High |
15603737
|
| 2010 |
The fifth BAG domain (BD5) of BAG5 is responsible for interaction with the Hsp70 nucleotide-binding domain (NBD). Crystal structures of the BD5-NBD complex reveal that BD5 binding causes conformational changes in the NBD that disrupt the nucleotide-binding groove, reducing NBD affinity for ADP. BD5 and full-length BAG5 accelerate Hsp70-mediated refolding in vitro, establishing BAG5 as a nucleotide exchange factor (NEF) for Hsp70. |
Crystal structure determination, in vitro ADP-binding affinity assay, in vitro protein refolding assay |
Structure |
High |
20223214
|
| 2011 |
BAG5 forms a protein complex with CHIP (E3 ubiquitin ligase) and alpha-synuclein in brain, mediated by Hsp70 binding to CHIP's TPR domain and BAG5's BAG domains. BAG5 inhibits CHIP E3 ubiquitin ligase activity toward alpha-synuclein, reducing alpha-synuclein ubiquitinylation and thereby increasing alpha-synuclein oligomerization. |
Co-immunoprecipitation from brain tissue, in vitro ubiquitinylation assay, luciferase protein-fragment complementation assay of alpha-synuclein oligomerization |
PloS one |
High |
21358815
|
| 2013 |
BAG5 interacts with the ER-resident chaperone GRP78/BiP and enhances its ATPase activity. During ER stress, BAG5 relocates from the cytoplasm to the ER and inhibits ER-stress-induced apoptosis by suppressing the PERK-eIF2-ATF4 axis while enhancing the IRE1-Xbp1 axis of the unfolded protein response. |
Co-immunoprecipitation, ATPase activity assay, subcellular fractionation/relocalization, siRNA knockdown and overexpression with apoptosis readouts |
BMC cancer |
Medium |
23448667
|
| 2014 |
BAG5 directly interacts with PINK1, stabilizes PINK1 by decreasing its ubiquitination, and thereby protects against mitochondrial dysfunction induced by MPP+ and rotenone. |
Yeast two-hybrid, GST pulldown, co-immunoprecipitation, ubiquitination assay, cell viability assay with mitochondrial toxins |
PloS one |
Medium |
24475098
|
| 2013 |
BAG5, as an inhibitor of CHIP E3 ubiquitin ligase activity, reduces CHIP-mediated ubiquitination and degradation of PTEN, thereby maintaining PTEN protein levels via a ubiquitylation-dependent pathway. |
Co-immunoprecipitation, ubiquitination assay, western blot |
BMB reports |
Low |
24148769
|
| 2014 |
BAG2 and BAG5 stabilize pathogenic ataxin3-80Q by inhibiting its ubiquitination, as shown by co-immunofluorescence and western blotting experiments. |
Co-immunofluorescence, western blotting, ubiquitination assay |
The International journal of neuroscience |
Low |
25006867
|
| 2016 |
BAG5 interacts with mutant p53 (mutp53) proteins and protects mutp53 from ubiquitination and degradation by E3 ubiquitin ligases MDM2 and CHIP, leading to mutp53 accumulation and gain-of-function activities including increased cell proliferation, tumor growth, cell migration, and chemoresistance. |
Co-immunoprecipitation, ubiquitination assay, siRNA knockdown and overexpression with proliferation/migration/tumor growth assays |
Cell discovery |
Medium |
27807478
|
| 2017 |
BAG5 interacts with DJ-1 in mammalian cells, decreases DJ-1 stability, and weakens DJ-1's role in mitochondrial protection, possibly by influencing DJ-1 dimerization under stress conditions. |
Co-immunoprecipitation, immunofluorescence, western blot |
Oxidative medicine and cellular longevity |
Low |
28348719
|
| 2019 |
BAG5 impairs Parkin-dependent mitophagy by suppressing Parkin recruitment to damaged mitochondria and reducing movement of damaged mitochondria into lysosomes. BAG5 also enhances Parkin-mediated Mcl-1 degradation and cell death following severe mitochondrial insult, suggesting BAG5 regulates the bi-modal activity of Parkin. |
Live-cell imaging of mitochondrial recruitment, lysosomal colocalization assay, cell death assays, Mcl-1 degradation assay |
Cell death & disease |
Medium |
31787745
|
| 2020 |
BAG5 interacts with p62/SQSTM1, enhances formation of pathogenic alpha-synuclein oligomers, and regulates the levels and subcellular distribution of p62, bridging the chaperone network to autophagy-mediated protein degradation. |
Co-immunoprecipitation, alpha-synuclein oligomerization assay, subcellular fractionation/immunofluorescence |
Frontiers in cell and developmental biology |
Medium |
32850835
|
| 2020 |
Stress-induced p53 binds directly to the BAG5 promoter to stimulate BAG5 expression. Induced BAG5 binds alpha-synuclein and Hsp70 in cell cultures and PD patient brain lysates, and BAG5 expression is required for alpha-synuclein aggregation in SH-SY5Y cells. |
ChIP assay (p53 binding to BAG5 promoter), co-immunoprecipitation from brain lysates, siRNA knockdown with aggregation readout |
Aging |
Medium |
33085644
|
| 2020 |
PRMT6 physically interacts with and methylates BAG5, and this methylation enhances degradation of BAG5's binding partner HSC70. PRMT6 deficiency leads to increased BAG5-associated HSC70 stability, promoting autophagy and tumorigenicity in hepatocellular carcinoma. |
Co-immunoprecipitation, methylation assay, genetic knockdown of BAG5 with in vivo tumor model |
Cancer letters |
Medium |
33186656
|
| 2022 |
Loss-of-function mutations in BAG5 cause inherited dilated cardiomyopathy. BAG5 acts as a nucleotide exchange factor for HSC70, promoting ADP release and activating HSC70-mediated protein folding. BAG5 localizes to junctional membrane complexes (JMCs) in cardiomyocytes; its loss disrupts JMC structure and calcium handling. AAV9-mediated wild-type BAG5 gene delivery fully rescues the DCM phenotype in knock-in mice. |
Human genetics (homozygous truncating mutations), knock-in mouse model, immunocytochemistry for JMC localization, calcium handling assays, AAV9 gene rescue |
Science translational medicine |
High |
35044787
|
| 2020 |
BAG5 modulates fibronectin 1 (FN1) expression at the translational level in papillary thyroid cancer cells, promoting invasion via suppression of miR-144-3p, which targets the 3' UTR of FN1 transcript. |
BAG5 overexpression/knockdown, western blot and polysome fractionation for translational regulation, invasion assay, miR-144-3p functional assay |
Biochimica et biophysica acta. Molecular cell research |
Low |
32275930
|
| 2024 |
BAG5 forms a complex with HSPA8 in spermatids and promotes folding of SPATA6 (a sperm head-tail coupling apparatus component) by enhancing HSPA8's affinity for substrate proteins. BAG5-deficient male mice show misfolded SPATA6, MYO5A, MYL6, DYNLT1, DCTN1, and DNAL1, leading to aberrant HTCA assembly, acephalic spermatozoa syndrome, and male infertility. |
BAG5 knockout mouse model, co-immunoprecipitation, in vitro chaperone substrate-affinity assay, immunofluorescence of spermatid assembly |
EMBO reports |
High |
38454159
|
| 2023 |
BAG5 interacts with Akt at the linker region between its first and second BAG domains, and Akt phosphorylates BAG5's first BAG domain. BAG5 switches Akt from monoubiquitination to polyubiquitination (together with Hsp70), promoting Akt degradation. The BAG5-Akt complex forms under serum-starved conditions and dissociates upon HGF stimulation, coincident with BAG5 phosphorylation. |
Co-immunoprecipitation, ubiquitination assay, BAG5 knockdown/overexpression with Akt stability readouts, deletion mapping of interaction domain |
International journal of molecular sciences |
Medium |
38139359
|
| 2010 |
BAG5 directly interacts with Parkin through all four BAG domains and stabilizes Parkin protein by interfering with its degradation via the ubiquitin-mediated proteasomal pathway. |
GST pulldown, co-immunoprecipitation, cycloheximide chase/ubiquitination assay |
Zhong nan da xue xue bao. Yi xue ban |
Low |
21131737
|
| 2025 |
BAG5 interacts with HSPA2 (testis-specific HSP70 family member) in spermatocytes. BAG5 deficiency reduces HSPA2 levels, leading to germ cell apoptosis, impaired transcription of transition proteins (TNPs) and protamines (PRMs), defective nuclear protein exchange, sperm head deformity, and male infertility. |
Bag5 knockout mouse model, IP-mass spectrometry, co-immunoprecipitation, RNA sequencing of knockout testis, western blot |
Cellular and molecular life sciences |
Medium |
39992433
|
| 2024 |
A novel BAG5 frameshift variant (c.444_445delGA) causes DCM by impairing the ER stress response. Bag5-/- knock-in mice show reduced cardiac function and increased apoptosis following tunicamycin (ER stress) challenge, demonstrating BAG5 is required for normal ER stress response in the heart. |
Human exome/Sanger sequencing, knock-in mouse model, tunicamycin challenge, echocardiography, apoptosis assay |
Scientific reports |
Medium |
38796549
|
| 2026 |
BAG5 interacts with HSPA1A (identified by immunoprecipitation-mass spectrometry). The HSPA1A-BAG5 complex promotes ubiquitination-mediated degradation of ATF2, subsequently downregulating apoptotic signaling in spermatogenic cells. |
Co-immunoprecipitation-mass spectrometry, co-immunoprecipitation validation, ubiquitination assay, overexpression/knockdown in spermatogonia/spermatocytes |
Tissue & cell |
Low |
41558067
|