| 1999 |
SEPTIN5 (CDCrel-1) directly binds syntaxin-1A via the SNARE interaction domain, associates with synaptic vesicle membrane fractions, and co-immunoprecipitates with syntaxin and Nedd5. Overexpression of wild-type CDCrel-1 inhibited secretion in HIT-T15 cells, whereas GTPase dominant-negative mutants enhanced secretion, establishing SEPTIN5 as an inhibitor of exocytosis acting through syntaxin. |
Subcellular fractionation, co-immunoprecipitation, direct binding assay, transfection with wild-type and dominant-negative GTPase mutants in HIT-T15 cells |
Nature neuroscience |
High |
10321247
|
| 2000 |
Parkin acts as an E3 ubiquitin-protein ligase (through its C-terminal RING-finger domains, with E2 enzyme UbcH8) that ubiquitinates and promotes proteasomal degradation of SEPTIN5 (CDCrel-1). Parkin binds SEPTIN5 through its RING-finger domains. Familial Parkinson's disease-linked parkin mutations disrupt this ubiquitin ligase function and impair SEPTIN5 degradation. |
In vitro ubiquitination assay, co-immunoprecipitation, cell-based degradation assay, site-directed mutagenesis of Parkin RING domains |
Proceedings of the National Academy of Sciences of the United States of America |
High |
11078524
|
| 2002 |
SEPTIN5 (CDCrel-1) forms a heteromeric complex with septins Nedd5 and CDC10 in neurons. CDCrel-1 null mice show altered expression of other septins, suggesting functional redundancy within the septin complex. CDCrel-1 expression rises at synaptic maturation. Homozygous CDCrel-1 knockout mice display normal synaptic properties and hippocampal neuron growth in vitro. |
Co-immunoprecipitation, generation of CDCrel-1 knockout mice, electrophysiological and morphological analysis |
Molecular and cellular biology |
High |
11739749
|
| 2002 |
SEPTIN5 (CDCrel-1) physically interacts with KIAA0202 (another human septin), as demonstrated by yeast two-hybrid and confirmed by GST pull-down and co-immunoprecipitation from the K-562 human leukemia cell line. |
Yeast two-hybrid, GST pull-down, co-immunoprecipitation |
FEBS letters |
Medium |
12023038
|
| 2003 |
SEPT5_v2, a splice variant of SEPTIN5, is a parkin-binding protein. It binds parkin at the amino terminus and ring finger domains. Parkin ubiquitinates SEPT5_v2 in vitro, and both SEPT5_v1 and SEPT5_v2 accumulate in brains of autosomal-recessive juvenile parkinsonism patients, indicating parkin is essential for their normal turnover. |
Yeast two-hybrid screen, co-immunoprecipitation from human substantia nigra lysates, in vitro ubiquitination assay, post-mortem brain protein analysis |
Brain research. Molecular brain research |
High |
14559152
|
| 2003 |
Overexpression of SEPTIN5 (CDCrel-1) in the substantia nigra via AAV-mediated gene transfer causes progressive loss of dopaminergic neurons in a dopamine-dependent manner. SEPTIN5 inhibits dopamine release from PC12 cells, and pharmacological inhibition of dopamine synthesis prevents CDCrel-1-induced neurodegeneration in vivo. |
AAV-mediated in vivo gene transfer to rat substantia nigra, dopaminergic neuron counting, striatal dopamine measurement, PC12 cell dopamine release assay, pharmacological inhibition |
Proceedings of the National Academy of Sciences of the United States of America |
High |
14530399
|
| 2005 |
SEPTIN5 (Sept5) binds syntaxin within the assembled SNARE complex (7S complex), but cannot bind an nSec1-syntaxin complex. Alpha-SNAP binding to the SNARE complex occludes Sept5 binding, indicating Sept5 and alpha-SNAP compete for binding to the syntaxin-containing 7S complex, suggesting a regulatory role for Sept5 in SNARE availability. |
In vitro binding assays mapping Sept5 domains required for syntaxin binding, competitive binding assays with purified SNARE complexes and alpha-SNAP |
The Biochemical journal |
High |
15355307
|
| 2006 |
SEPTIN5 (SEPT5) interacts with SEPT11 in human endothelial cells. The interaction requires the GTP-binding domain and C-terminal extension of SEPT11, confirmed by yeast two-hybrid, co-precipitation from JURKAT cell lysates, and FRET. Both proteins are co-expressed in HUVECs. |
Yeast two-hybrid, co-immunoprecipitation, FRET, domain deletion analysis |
The Journal of pathology |
Medium |
16767699
|
| 2007 |
Cyclin-dependent kinase 5 (Cdk5)/p35 phosphorylates SEPTIN5 (Sept5_v1) at Ser17 in vitro and in mouse brain. Phosphorylation at Ser17 decreases binding of Sept5_v1 to syntaxin-1, as shown by co-immunoprecipitation from synaptosomal fractions and GST-syntaxin-1A pull-down assays. |
Mass spectrometry identification of Cdk5 substrates, in vitro kinase assay, site-directed mutagenesis (Ser17), GST pull-down, co-immunoprecipitation from synaptosomal fractions |
The Journal of biological chemistry |
High |
17224448
|
| 2007 |
Sept3 directly binds Sept5 and Sept7 and forms a heteromeric complex at nerve terminals in mature neurons, adjacent to synaptophysin-positive synaptic vesicle regions, as demonstrated by direct binding assays and co-localization in hippocampal neurons. |
Direct binding assay, co-localization by immunofluorescence in primary neurons, Sept3 knockout mouse generation |
Journal of neurochemistry |
Medium |
17564677
|
| 2008 |
Cdk5/p35 phosphorylates human SEPTIN5 (hCDCrel-1) at Ser327. Phosphorylation at S327 decreases SEPTIN5 binding to syntaxin-1 (shown by Co-IP from synaptic vesicle fractions and Cdk5 knockout lysates). A non-phosphorylatable S327A mutant binds syntaxin more efficiently than wild-type and potentiates regulated exocytosis more than wild-type when expressed in PC12 cells. |
Yeast two-hybrid screen, GST pull-down, co-immunoprecipitation, in vitro and in vivo phosphorylation assay, site-directed mutagenesis (S327A), PC12 cell exocytosis assay |
The Journal of neuroscience |
High |
18385322
|
| 2010 |
ARMS/Kidins220 interacts with SEPTIN5 (Sept5) through the N-terminal region of Sept5. The interaction was confirmed by co-immunoprecipitation from HEK-293 cells. Endogenous proteins co-localize at the plasma membrane and neurite tips in hippocampal neurons and NGF-treated PC12 cells. |
Yeast two-hybrid, co-immunoprecipitation from transfected HEK-293 cells, domain mapping, co-localization in primary neurons and PC12 cells |
Molecules and cells |
Medium |
20680483
|
| 2020 |
Downregulation of SEPTIN5 reduces levels of APP C-terminal fragments (APP CTFs) and Aβ in neuronal cells and in Septin5 knockout mouse cortex. Mechanistically, SEPTIN5 knockdown increases degradation of APP CTFs via the autophagosomal pathway, without affecting APP secretory trafficking or endocytosis, and enhances autophagosomal activity as indicated by altered autophagosomal marker levels. |
shRNA knockdown, Septin5 knockout mice, APP CTF and Aβ measurement by ELISA/Western blot, autophagy marker analysis, APP trafficking assay |
Cells |
High |
33203136
|
| 2021 |
SEPTIN5 S327 phosphorylation status affects APP processing and autophagy markers in primary cortical neurons (assessed using lentiviral phosphomutants S327A and S327D). S327 phosphorylation status also influences short-term synaptic plasticity at the CA3-CA1 synapse ex vivo, linking this post-translational modification to synaptic function. |
Lentiviral transduction of primary mouse cortical neurons with wild-type SEPTIN5 and phosphomutants (S327A, S327D), APP processing assays, autophagy marker quantification, ex vivo electrophysiology (CA3-CA1) |
Neurobiology of disease |
Medium |
34954322
|
| 2024 |
SEPTIN5 (CDCrel-1) interacts with VMAT2 in rat striatum, and binge methamphetamine alters this interaction as well as the subcellular localization of SEPTIN5. |
Co-immunoprecipitation from rat striatal tissue, subcellular fractionation, in vivo METH treatment model |
International journal of molecular sciences |
Medium |
39684782
|
| 2024 |
Co-expression of Sept8-204 with SEPT5 induces formation of small vesicle-like structures that co-localize with synaptophysin. This vesicle-like structure and co-localization require palmitoylation of Sept8-204 (controlled by ZDHHC17/PPT1); loss of palmitoylation causes Sept8-204/SEPT5 to form large puncta that do not co-localize with synaptophysin. |
Fluorescence microscopy of co-expressed septins, palmitoylation inhibition (2-BP), ZDHHC17 and PPT1 knockouts, co-localization with synaptophysin marker |
Journal of cellular biochemistry |
Medium |
38308620
|
| 2025 |
In pancreatic β-cells, SEPTIN5 is preferentially assembled at microtubule-plasma membrane contact sites in a microtubule-dependent manner, where it anchors secretory granules. Septin5 deletion destabilizes the cortical microtubule meshwork, increases insulin granule dynamics and access to the plasma membrane, increases releasable granule pool clustering on L-type Ca2+ channels, and dramatically enhances glucose-stimulated insulin secretion including in type 2 diabetes. |
Super-resolution imaging, Septin5 knockout rodent model, live-cell imaging of granule dynamics, Ca2+ channel co-localization analysis, insulin secretion assay in rodent and human islets |
Nature communications |
High |
40108136
|
| 1998 |
SEPTIN5 (hCDCrel-1) protein localizes to neurons in adult human brain and co-purifies with synaptosomes marked by SNAP-25 and synaptophysin, indicating a presynaptic localization. |
Immunohistochemistry, subcellular fractionation/co-purification with synaptosomal markers |
Neuroreport |
Medium |
9760144
|