| 2018 |
Synaptotagmin-11 (Syt11) is a physiological substrate of parkin (E3 ubiquitin ligase). Overexpression of full-length, but not C2B-truncated, Syt11 in dopaminergic neurons of the substantia nigra pars compacta impairs striatal dopamine release by inhibiting endocytosis and vesicle pool replenishment, causing dopaminergic neuron degeneration. Parkin deficiency leads to Syt11 accumulation and PD-like neurotoxicity, which is reversed by SYT11 knockdown or knockout in dopaminergic neurons. |
In vivo unilateral overexpression, conditional knockout, parkin-deficient mouse models, dopamine release measurements, motor behavior assays, immunoprecipitation |
Nature communications |
High |
29311685
|
| 2016 |
ATP13A2 depletion negatively regulates SYT11 at both transcriptional and post-translational levels. Decreased SYT11 transcription is controlled by MYCBP2-induced ubiquitination of TSC2, leading to mTORC1 activation and decreased TFEB-mediated transcription of SYT11. Increased SYT11 protein turnover is regulated by its ubiquitination and degradation. Decreased SYT11 levels induce lysosomal dysfunction and impaired autophagosome degradation. |
siRNA knockdown, transcriptional assays, ubiquitination assays, lysosomal function assays, mTORC1/TFEB pathway analysis |
Nature communications |
High |
27278822
|
| 2019 |
Syt11 resides on abundant vesicles resembling trafficking endosomes (distinct from synaptic vesicles) in neurons. These vesicles recycle via the plasma membrane in an activity-dependent manner with slow, desynchronized exocytosis. Constitutive Syt11 knockout mice die shortly after birth. Conditional knockout in excitatory forebrain neurons impairs synaptic plasticity and memory without affecting fast neurotransmitter or peptide secretion, but reduces long-term synaptic potentiation. |
Conditional and constitutive knockout mice, live imaging, mass spectrometry (Syt11 interactome), electrophysiology, behavioral assays |
Genes & development |
High |
30808661
|
| 2017 |
Syt11 inhibits cytokine secretion (IL-6, TNF-α) and phagocytosis in microglia. Syt11 localizes to the trans-Golgi network and recycling endosomes, and is recruited to phagosomes. Syt11 knockdown increases NF-κB activation and cytokine synthesis/secretion capacity, and enhances phagocytosis including of α-synuclein fibrils. Overexpression of Syt11 suppresses these functions. |
siRNA knockdown, overexpression rescue, immunofluorescence localization, cytokine ELISA, phagocytosis assays, NF-κB activation assays |
Glia |
High |
28686317
|
| 2023 |
Syt11 is palmitoylated at Cys39 and Cys40 (adjacent to its transmembrane domain) in mouse and human brain tissue and cultured cortical neurons. This palmitoylation localizes Syt11 to digitonin-insoluble intracellular membranes and protects it from endolysosomal degradation. Palmitoylation-mediated increase in Syt11 abundance enhances α-synuclein binding to intracellular membranes, decreasing physiologic tetrameric α-synuclein and increasing aggregation-prone monomeric α-synuclein. A palmitoylation-deficient mutant does not replicate these effects. |
Palmitoylation assays (acyl-RAC), site-directed mutagenesis, biochemical fractionation, α-synuclein tetramer/monomer quantification in neurons, overexpression of WT vs palmitoylation-deficient mutant |
Science signaling |
High |
36787382
|
| 2021 |
Syt11 inhibits spontaneous neurotransmitter release by directly interacting with vti1a (a non-canonical SNARE protein that maintains spontaneous release). The C2A domain of Syt11 binds vti1a with high affinity. Syt11-KO hippocampal neurons show increased miniature EPSC frequency; vti1a knockdown reverses this phenotype, identifying vti1a as the main target. |
GST pull-down, co-immunoprecipitation, affinity purification, Syt11 knockout neurons, electrophysiology (mEPSC recording), vti1a knockdown epistasis |
Journal of neurochemistry |
High |
34599505
|
| 2023 |
Syt11 inhibits synaptic vesicle (SV) endocytosis through direct, Ca2+-independent binding to endophilin A1 (EndoA1) via the C2B domain of Syt11 and the N-terminus of EndoA1. Syt11-KO accelerates SV endocytosis and vesicle recycling. A peptide (aa 314-336) from Syt11 C2B blocks Syt11-EndoA1 binding in vitro and in vivo, inhibiting SV endocytosis. EndoA1 knockdown reverses the Syt11-KO phenotype, establishing EndoA1 as the main inhibitory target of Syt11 in SV endocytosis. |
GST pull-down, co-immunoprecipitation, Syt11-KO mouse neurons, EndoA1 knockdown epistasis, peptide competition assays, electrophysiology at calyx of Held, live imaging |
The Journal of neuroscience |
High |
37474308
|
| 2024 |
Syt11 binds both the auxiliary GABAB receptor (GBR) subunit KCTD16 and Cav2.2 Ca2+ channels. Through these dual interactions, Syt11 recruits GBRs and Cav2.2 channels to post-Golgi vesicles, facilitating assembly of GBR/Cav2.2 signaling complexes. Syt11 also stabilizes GBRs and Cav2.2 at the neuronal plasma membrane by inhibiting constitutive internalization. Syt11-KO mice show deficits in presynaptic GBRs and Cav2.2, reduced neurotransmitter release, and decreased GBR-mediated presynaptic inhibition. |
Co-immunoprecipitation, proximity ligation, Syt11 KO mouse analysis, electrophysiology, live imaging, biochemical fractionation |
EMBO reports |
High |
38698221
|
| 2019 |
Syt11 regulates caveolae-mediated endocytosis and caveolar response to mechanical stimuli in astrocytes. Syt11-KO accelerates caveolae-mediated endocytosis, reduces caveolar structures on the cell surface, and impairs caveolar disassembly and astrocyte swelling during hypoosmotic stimuli. Syt11 directly interacts with cavin1 and EHD2 (but not caveolin-1), and its absence increases turnover of cavin1 and EHD2 and compromises membrane integrity. Live imaging showed Syt11 leaves caveolar structures before cavin1 during hypoosmotic stress. |
Syt11 KO astrocytes, live imaging, co-immunoprecipitation/pulldown, electron microscopy, osmotic stress assays, endocytosis assays |
FASEB journal |
High |
31908017
|
| 2023 |
Syt11 inhibits microglial immune responses in vivo. Inducible microglia-specific Syt11-cKO results in microglial activation and elevated cytokine mRNA. In a PD model, Syt11-cKO microglia show reduced migration to injection sites but enhanced phagocytosis of α-synuclein fibrils. Syt11 directly binds vti1a and vti1b via its linker domain; a competitive peptide derived from this domain induces cytokine secretion in WT microglia, phenocopying Syt11 KD. |
Inducible microglia-specific conditional KO, LPS and PD model in vivo, co-immunoprecipitation, peptide competition assay, cytokine measurements, phagocytosis assay |
Journal of neurochemistry |
High |
37924268
|
| 2022 |
SYT11 functions as a scaffold protein in gastric cancer cells, binding both MKK7 and JNK1 to promote JNK1 phosphorylation. JNK activation leads to cJun activation and downstream expression of EMT-related genes (ANGPTL2, THBS4, Vimentin, JAM3). SYT11 knockdown reduces spheroid formation, tumor formation, and liver metastasis. |
Phospho-kinase array, co-immunoprecipitation, western blot, shRNA knockdown, mouse xenograft, liver metastasis model |
Journal of experimental & clinical cancer research |
Medium |
35768842
|
| 2022 |
Impad1 interacts directly with Syt11 (a vesicle trafficking protein) to modulate Golgi apparatus morphology and vesicular trafficking. This interaction alters the extracellular matrix and tumor microenvironment to promote lung cancer invasion and metastasis. Inhibiting either Impad1 or Syt11 disrupts the cancer cell secretome and reverses invasive/metastatic phenotype. |
Co-immunoprecipitation/interaction assays, in vitro and in vivo shRNA screens, Golgi morphology imaging, secretome analysis, invasion and metastasis assays |
Cell reports |
Medium |
36170810
|
| 2014 |
Syt11 interacts with components of the RNA-induced silencing complex (RISC) in pancreatic β-cells. The C2A domain of Syt11 interacts with the Q-SNARE Vti1a, while the C2B domain interacts with SND1, Ago2, and FMRP (RISC components). Binding of C2B to SND1 was shown to be direct via SND1's N-terminal tandem repeats. |
Affinity purification/mass spectrometry, co-immunoprecipitation, domain-specific pulldowns, direct binding assay |
FEBS letters |
Medium |
24882364
|
| 2012 |
Syt11 is expressed mainly in the brain and localizes to presynaptic neurotransmitter vesicles and plasma membrane (with some postsynaptic localization). Exogenously expressed Syt11 can form higher molecular weight complexes via its transmembrane domain. Syt11 is targeted to both dendrite and axon compartments, and is juxtaposed to postsynaptic markers in excitatory and inhibitory synapses. Both neuroligin-1 and neuroligin-2 recruit Syt11 in neuron co-culture. |
Immunocytochemistry, immunogold electron microscopy, subcellular fractionation, neuroligin recruitment assay, HEK293 expression |
Neuroscience |
Medium |
22960622
|
| 2007 |
Transcriptional activity of the Syt11 gene is affected by the number of 33-bp repeats in its promoter region (containing an Sp1 binding site), with excessive expression associated with schizophrenia. A SNP in the 5'UTR region where YY1 can bind also affects transcriptional activity of Syt11. |
Reporter/transient transcription assays, gel mobility shift assay, genetic association |
American journal of medical genetics. Part B, Neuropsychiatric genetics |
Medium |
17192956
|
| 2005 |
Non-CpG methylation in the promoter region of syt11 reduces the binding of an Sp family transcription factor, thereby reducing syt11 expression. Cytosine residues in the minus strand of the promoter are partially methylated, and artificial methylation of these sites reduces reporter gene expression. |
Gel mobility shift assay, transient transcription assay with artificially methylated promoter, sequence analysis |
Gene |
Medium |
15777718
|
| 2020 |
Syt11 is a short-lived protein degraded primarily by the ubiquitin-proteasome pathway (UPP) in neurons (half-life ~1.49 h). Degradation is accelerated under sustained neuronal activity in a parkin-dependent manner. In astrocytes, Syt11 has a faster turnover (half-life ~0.58 h) partially via UPP, but is degraded via a parkin-independent mechanism under both isoosmotic and hypoosmotic conditions. |
Cycloheximide chase, proteasome inhibitors, parkin overexpression/knockdown, neuronal activity manipulation, western blot |
Neuroscience letters |
Medium |
32976921
|
| 2024 |
Syt11 deficiency in dopamine neurons during early adolescence (but not in adults) leads to persistent social deficits and schizophrenia-like behaviors by mediating dopamine over-transmission. Dopamine neuron over-excitation before late adolescence induces persistent schizophrenia-associated behavioral deficits with structural and functional alterations in the mPFC. D2R-targeting interventions presynaptically or postsynaptically show therapeutic effects on social deficits. |
Conditional Syt11 knockout in dopamine neurons (developmental stage-specific), electrophysiology, dopamine measurements, behavioral assays, mPFC structural/functional analysis |
Nature communications |
High |
39632880
|
| 2022 |
Syt11 and Syt13 co-localize with insulin in insulin granules in β-cells. Downregulation of Syt11 in INS-1 832/13 cells increases basal and glucose-induced insulin secretion (suggesting an inhibitory role), without affecting exocytosis amplitude or Ca2+ currents. Downregulation of Syt13 decreases insulin secretion and abolishes forskolin-enhanced secretion. |
siRNA knockdown, ELISA, patch-clamp electrophysiology, confocal microscopy colocalization |
Acta physiologica |
Medium |
35753051
|
| 2025 |
VHL (an E3 ubiquitin ligase) binds SYT11 protein and promotes its proteasomal degradation by ubiquitination. VHL overexpression decreases SYT11 protein (not mRNA) and shortens its half-life; MG132 (proteasome inhibitor) reverses this. VHL-mediated SYT11 degradation downregulates SPINK1, which in turn inhibits gastric cancer cell growth and invasion. |
Co-immunoprecipitation, ubiquitination assay, MG132 rescue, cycloheximide chase, transcriptome sequencing, knockdown/overexpression functional assays |
Journal of cellular and molecular medicine |
Medium |
40576306
|
| 2025 |
Compensatory upregulation of Syt11 in parkin knockout mice during the suckling stage (but not in adults) conceals PD-associated phenotypes. Parkin knockdown in adult SNpc impairs dopamine release and causes motor deficits. Overexpression of Syt11 alone induces PD-like motor and non-motor impairments, impaired dopamine release and reuptake. |
Parkin KO and KD mouse models, Syt11 overexpression in SNpc, dopamine release measurements, motor behavior assays, western blot |
Cell communication and signaling |
Medium |
39901263
|