| 1996 |
Mammalian Sly1 (SCFD1) forms a native complex with syntaxin 5 on ER-Golgi membranes, and overexpression of rat Sly1 neutralizes the dominant-negative effects of excess syntaxin 5 on ER-to-Golgi transport, establishing that Sly1 positively regulates syntaxin 5 function in the early secretory pathway. |
Co-immunoprecipitation from rat liver membranes; transient overexpression rescue assay |
The Journal of biological chemistry |
High |
8663406
|
| 1996 |
Rat Sly1 (SCFD1/RA410) is a member of the Sec1/Munc18 family and is expressed ubiquitously in all rat tissues examined, consistent with a general role in vesicular transport. |
cDNA cloning, sequence analysis, Northern blotting |
Gene |
Medium |
8647468
|
| 1997 |
RA410 (rat Sly1/SCFD1) protein localizes predominantly to the plasma membrane fraction and to large vesicles associated with the Golgi (but not in the Golgi itself) by sucrose gradient fractionation and immunoelectron microscopy, consistent with a role in post-Golgi vesicular transport; it is also induced as an immediate-early gene in astrocytes upon reoxygenation. |
Sucrose gradient fractionation, immunoelectron microscopy, Western blotting |
The Journal of biological chemistry |
Medium |
9195952
|
| 2002 |
Sly1 binds to a short, evolutionarily conserved N-terminal peptide motif of syntaxins 5 and 18 (vertebrates) and their yeast orthologues Sed5p and Ufe1p, a binding mode distinct from the closed-conformation interaction of Munc18 with syntaxin 1, suggesting a general peptide-based SM–syntaxin interaction mechanism. |
Biochemical pulldown with purified proteins; sequence analysis; binding assays with truncation mutants |
Developmental cell |
High |
11879635
|
| 2002 |
Sly1p bound to the Golgi syntaxin Sed5p permits assembly of ER-to-Golgi SNARE fusion complexes (Sed5p-Bos1p-Sec22p-Bet1p) in vitro; Sly1p also joins preassembled SNARE complexes and is present in SNARE complexes immunoprecipitated from yeast lysates. Crucially, Sly1p-bound Sed5p suppresses formation of non-physiological SNARE complexes, demonstrating that the SM protein contributes to SNARE pairing specificity. |
In vitro SNARE complex assembly with purified proteins; co-immunoprecipitation from yeast lysates |
The Journal of cell biology |
High |
11994317
|
| 2002 |
In yeast, Sly1p binding to Sed5p enhances formation of the trans-SNARE complex (Sed5p–Bet1p) in vitro in yeast lysates; a temperature-sensitive Sly1p mutant with reduced Sed5p binding shows reduced complex formation, and recombinant Sly1p added back rescues complex assembly. |
Co-immunoprecipitation; in vitro SNARE complex formation in yeast lysates; temperature-sensitive mutant analysis |
Journal of cell science |
High |
12186954
|
| 2003 |
Sly1p cooperates with Sec18/NSF in disassembly of cis-SNARE complexes: a Sly1p temperature-sensitive mutant defective in Sed5p binding shows retarded cis-SNARE complex disassembly, and sec18-1/sly1-ts double mutants are synthetically lethal, placing Sly1 upstream of NSF-mediated SNARE recycling. |
Temperature-sensitive mutant analysis; synthetic lethality genetic epistasis; in vitro SNARE disassembly assay |
Bioscience, biotechnology, and biochemistry |
Medium |
12729020
|
| 2005 |
In yeast, the Sly1-20 gain-of-function allele bypasses GTPase requirements for ER-Golgi vesicle tethering by allowing an alternative Rab (Ypt6) to substitute for Ypt1p; Uso1p-dependent vesicle tethering is not bypassed, establishing that Sly1-20 does not circumvent the requirement for tethering per se but shifts Rab dependency. |
Co-immunoprecipitation; in vitro tethering and fusion assays with ypt1Δ/SLY1-20 membranes; Rab GDP dissociation inhibitor sensitivity assay |
Molecular biology of the cell |
High |
15689495
|
| 2005 |
RA410/Sly1 (SCFD1) protects dopaminergic SH-SY5Y cells from MPP+- and 6-OHDA-induced cell death; antisense knockdown accelerates ER disruption and increases caspase-2, -3, and -9 activation, while sense overexpression suppresses caspase activation, indicating a cytoprotective role linked to ER integrity. |
Antisense/sense RNA stable transfection; electron microscopy of ER morphology; caspase activity assays; cell viability assay |
Neurobiology of disease |
Medium |
15649705
|
| 2007 |
All gain-of-function SLY1-20-type mutations in yeast Sly1p that bypass Ypt/Rab GTPase requirements map to or cause deletion of a conserved short α-helix (α-20); deletion of α-20 alone is sufficient for GTPase bypass, identifying this helix as a regulatory element mediating Ypt/Rab-controlled Sly1 function in membrane fusion. |
Site-directed mutagenesis; yeast genetic suppressor analysis; complementation assays with fungal and mammalian Sly1 homologues |
FEBS letters |
Medium |
18036347
|
| 2009 |
The SM protein Sly1 interacts directly with the COG tethering complex via the Cog4 subunit; Cog4 binds Syntaxin 5 through a different site. Disruption of the Cog4–Sly1 interaction impairs SNARE pairing for intra-Golgi transport and markedly attenuates Golgi-to-ER retrograde transport, linking tethering to SNAREpin assembly. |
Co-immunoprecipitation; GST pulldown with purified proteins; siRNA knockdown with retrograde transport assays |
The EMBO journal |
High |
19536132
|
| 2014 |
Sly1 binds both the closed conformation and the N-peptide of Sed5 simultaneously (in contrast to Munc18, which only engages the closed conformation of syntaxin 1); unlike Munc18, Sly1 facilitates SNARE complex formation by loosening the closed conformation of Sed5 rather than locking it. |
Fluorescence anisotropy binding assays; analytical ultracentrifugation; in vitro SNARE complex assembly kinetics with purified proteins |
Proceedings of the National Academy of Sciences of the United States of America |
High |
25189771
|
| 2014 |
SLY1 (SCFD1) interacts with the cytoplasmic domain of TANGO1 at ER exit sites and is required specifically for procollagen VII export from the ER; siRNA knockdown of SLY1 arrests procollagen VII in the ER without affecting COPII recruitment, general secretion, or retrograde KDEL-receptor transport. Of the two ER SNAREs that interact with SLY1 (syntaxins 17 and 18), only syntaxin 18 is required for this cargo. |
siRNA knockdown; co-immunoprecipitation; fluorescence microscopy of ER cargo retention; COPII/retrograde transport controls |
eLife |
High |
24842878
|
| 2016 |
Loss of Scfd1 in zebrafish impairs ER-to-Golgi transport of ECM proteins (type II collagen) in chondrocytes and activates the unfolded protein response; knockdown of either SCFD1 or its partner STX18 in mammalian chondrocytes severely impairs type II collagen transport, establishing a conserved SCFD1–STX18 pathway for secretion of large ECM proteins during chondrogenesis. |
Zebrafish forward genetic screen; morpholino/CRISPR knockdown; immunofluorescence of collagen trafficking; UPR reporter assays; mammalian chondrocyte siRNA knockdown |
Developmental biology |
High |
27851892
|
| 2021 |
mTORC1 inhibits autophagosome–lysosome fusion by phosphorylating VAMP8, which blocks SCFD1 recruitment to autolysosomes; dephosphorylated VAMP8 promotes SCFD1 localization to autolysosomes where SCFD1 is required for STX17–SNAP29–VAMP8 SNARE complex formation and autophagosome–lysosome fusion. A phosphomimetic VAMP8 mutant fails to support fusion in vitro and causes lipid droplet accumulation in mouse liver. |
In vitro autophagosome–lysosome fusion assay; siRNA knockdown; phosphomimetic/phosphoresistant mutant overexpression; live-cell imaging of SCFD1 localization; hepatocyte lipid droplet assay in vivo |
Nature communications |
High |
34785650
|
| 2022 |
SCFD1 is acetylated at K126 and K515 by the acetyltransferase KAT2B/PCAF, and deacetylated by SIRT4; acetylation of these residues inhibits autophagic flux by blocking STX17–SNAP29–VAMP8 SNARE complex formation. AMPK-mediated phosphorylation of SCFD1 disrupts its interaction with KAT2B, keeping acetylation levels low under autophagy-stimulating conditions. |
Mass spectrometry identification of acetylation sites; co-immunoprecipitation of SCFD1 with KAT2B and SIRT4; acetylation-site mutagenesis; SNARE complex pull-down; autophagic flux assays |
Autophagy |
High |
35465820
|
| 2023 |
Loss of scfd1 in zebrafish causes severe cardiac defects (reduced myofibril density, dilated cardiomyopathy) and craniofacial abnormalities accompanied by ER stress (upregulation of UPR and apoptosis markers) and Golgi fragmentation in cardiomyocytes, establishing that scfd1 is required for ER/Golgi membrane trafficking in cardiac development. |
CRISPR/Cas9 null mutant generation; electron microscopy of cardiomyocyte ultrastructure; qPCR for ER stress markers; echocardiography of adult heterozygotes |
Journal of cardiovascular development and disease |
High |
37887855
|
| 2023 |
Moderate knockdown of Slh (Drosophila orthologue of SCFD1) in adult flies causes climbing and flight defects; severe knockdown causes larval immobility, neuromuscular junction deficits, and lethality before metamorphosis; RNA-seq reveals downregulation of chaperone genes mediating protein folding downstream of Slh ablation. |
RNAi-mediated knockdown; climbing/flight behavioral assays; NMJ morphology analysis; RNA-seq transcriptomics |
Neurobiology of aging |
Medium |
36944290
|
| 2024 |
Sly1 contains an amphipathic lipid-packing sensor (ALPS)-like helix within its regulatory loop that directly binds high-curvature membranes; this binding both relieves autoinhibition of Sly1 and enables Sly1 to tether incoming vesicles to the Qa-SNARE on the target organelle at close range. The SLY1-20 gain-of-function mutation loses its bypass activity when tethering is additionally impaired, placing close-range tethering as an essential step before trans-SNARE assembly. |
Chemically defined in vitro ER-Golgi fusion reconstitution; membrane-binding assays with high-curvature liposomes; genetic epistasis (SLY1-20 combined with tethering loop mutations); SNARE mutant analysis |
The Journal of cell biology |
High |
38478018
|
| 2024 |
Sly1 promotes fusion through three parallel mechanisms: (i) opening the closed conformation of Sed5 (Qa-SNARE), (ii) close-range vesicle tethering via its regulatory loop, and (iii) nucleation of productive trans-SNARE complexes. The autoinhibitory Habc domain of Sed5 additionally promotes Sly1-dependent fusion by facilitating events leading to lipid mixing and is required for correct Sed5 localization. |
Chemically defined in vitro fusion assays with SNARE and Sly1 mutants; 'split Sed5' reconstitution in vitro and in vivo; lipid mixing assays |
The Journal of cell biology |
High |
38478017
|
| 2024 |
The Anaplasma phagocytophilum T4SS effector EgeA directly binds SCFD1 (by yeast two-hybrid), and both TANGO1 and SCFD1 are redistributed from ER-Golgi exit sites to pathogen-occupied inclusions during infection; knockdown of either TANGO1 or SCFD1 significantly reduces Anaplasma infection, establishing that the pathogen hijacks the TANGO1–SCFD1 ERES complex to acquire nutrients and reduce ER stress. |
Yeast two-hybrid (EgeA-C / SCFD1 direct binding); pulldown assay (EgeA-GFP / TANGO1); siRNA knockdown of TANGO1 and SCFD1; immunofluorescence localization to inclusion surface; ER stress marker qPCR |
Proceedings of the National Academy of Sciences of the United States of America |
High |
39106308
|