Interaction of the HOPS complex with Syntaxin 17 mediates autophagosome clearance in Drosophila
(2014) In Molecular Biology of the Cell 25(8). p.54-1338- Abstract
Homotypic fusion and vacuole protein sorting (HOPS) is a tethering complex required for trafficking to the vacuole/lysosome in yeast. Specific interaction of HOPS with certain SNARE (soluble NSF attachment protein receptor) proteins ensures the fusion of appropriate vesicles. HOPS function is less well characterized in metazoans. We show that all six HOPS subunits (Vps11 [vacuolar protein sorting 11]/CG32350, Vps18/Dor, Vps16A, Vps33A/Car, Vps39/CG7146, and Vps41/Lt) are required for fusion of autophagosomes with lysosomes in Drosophila. Loss of these genes results in large-scale accumulation of autophagosomes and blocks autophagic degradation under basal, starvation-induced, and developmental conditions. We find that HOPS colocalizes... (More)
Homotypic fusion and vacuole protein sorting (HOPS) is a tethering complex required for trafficking to the vacuole/lysosome in yeast. Specific interaction of HOPS with certain SNARE (soluble NSF attachment protein receptor) proteins ensures the fusion of appropriate vesicles. HOPS function is less well characterized in metazoans. We show that all six HOPS subunits (Vps11 [vacuolar protein sorting 11]/CG32350, Vps18/Dor, Vps16A, Vps33A/Car, Vps39/CG7146, and Vps41/Lt) are required for fusion of autophagosomes with lysosomes in Drosophila. Loss of these genes results in large-scale accumulation of autophagosomes and blocks autophagic degradation under basal, starvation-induced, and developmental conditions. We find that HOPS colocalizes and interacts with Syntaxin 17 (Syx17), the recently identified autophagosomal SNARE required for fusion in Drosophila and mammals, suggesting their association is critical during tethering and fusion of autophagosomes with lysosomes. HOPS, but not Syx17, is also required for endocytic down-regulation of Notch and Boss in developing eyes and for proper trafficking to lysosomes and eye pigment granules. We also show that the formation of autophagosomes and their fusion with lysosomes is largely unaffected in null mutants of Vps38/UVRAG (UV radiation resistance associated), a suggested binding partner of HOPS in mammals, while endocytic breakdown and lysosome biogenesis is perturbed. Our results establish the role of HOPS and its likely mechanism of action during autophagy in metazoans.
(Less)
- author
- Takáts, Szabolcs ; Pircs, Karolina LU ; Nagy, Péter ; Varga, Ágnes ; Kárpáti, Manuéla ; Hegedűs, Krisztina ; Kramer, Helmut ; Kovács, Attila L ; Sass, Miklós and Juhász, Gábor
- publishing date
- 2014-04
- type
- Contribution to journal
- publication status
- published
- keywords
- Animals, Autophagy, Cell Line, Down-Regulation, Drosophila, Drosophila Proteins, Eye, Eye Proteins, Lysosomal-Associated Membrane Protein 1, Lysosomes, Membrane Fusion, Membrane Glycoproteins, Mutation, Phagosomes, Pigment Epithelium of Eye, Qa-SNARE Proteins, R-SNARE Proteins, RNA Interference, RNA, Small Interfering, Receptors, Notch, Receptors, Peptide, Tumor Suppressor Proteins, Vesicular Transport Proteins, Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't
- in
- Molecular Biology of the Cell
- volume
- 25
- issue
- 8
- pages
- 17 pages
- publisher
- American Society for Cell Biology
- external identifiers
-
- scopus:84901308155
- pmid:24554766
- ISSN
- 1939-4586
- DOI
- 10.1091/mbc.E13-08-0449
- language
- English
- LU publication?
- no
- id
- 7185df88-52ba-4276-88be-8f31025ecf8e
- date added to LUP
- 2017-03-16 15:25:52
- date last changed
- 2024-09-15 22:13:06
@article{7185df88-52ba-4276-88be-8f31025ecf8e, abstract = {{<p>Homotypic fusion and vacuole protein sorting (HOPS) is a tethering complex required for trafficking to the vacuole/lysosome in yeast. Specific interaction of HOPS with certain SNARE (soluble NSF attachment protein receptor) proteins ensures the fusion of appropriate vesicles. HOPS function is less well characterized in metazoans. We show that all six HOPS subunits (Vps11 [vacuolar protein sorting 11]/CG32350, Vps18/Dor, Vps16A, Vps33A/Car, Vps39/CG7146, and Vps41/Lt) are required for fusion of autophagosomes with lysosomes in Drosophila. Loss of these genes results in large-scale accumulation of autophagosomes and blocks autophagic degradation under basal, starvation-induced, and developmental conditions. We find that HOPS colocalizes and interacts with Syntaxin 17 (Syx17), the recently identified autophagosomal SNARE required for fusion in Drosophila and mammals, suggesting their association is critical during tethering and fusion of autophagosomes with lysosomes. HOPS, but not Syx17, is also required for endocytic down-regulation of Notch and Boss in developing eyes and for proper trafficking to lysosomes and eye pigment granules. We also show that the formation of autophagosomes and their fusion with lysosomes is largely unaffected in null mutants of Vps38/UVRAG (UV radiation resistance associated), a suggested binding partner of HOPS in mammals, while endocytic breakdown and lysosome biogenesis is perturbed. Our results establish the role of HOPS and its likely mechanism of action during autophagy in metazoans.</p>}}, author = {{Takáts, Szabolcs and Pircs, Karolina and Nagy, Péter and Varga, Ágnes and Kárpáti, Manuéla and Hegedűs, Krisztina and Kramer, Helmut and Kovács, Attila L and Sass, Miklós and Juhász, Gábor}}, issn = {{1939-4586}}, keywords = {{Animals; Autophagy; Cell Line; Down-Regulation; Drosophila; Drosophila Proteins; Eye; Eye Proteins; Lysosomal-Associated Membrane Protein 1; Lysosomes; Membrane Fusion; Membrane Glycoproteins; Mutation; Phagosomes; Pigment Epithelium of Eye; Qa-SNARE Proteins; R-SNARE Proteins; RNA Interference; RNA, Small Interfering; Receptors, Notch; Receptors, Peptide; Tumor Suppressor Proteins; Vesicular Transport Proteins; Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't}}, language = {{eng}}, number = {{8}}, pages = {{54--1338}}, publisher = {{American Society for Cell Biology}}, series = {{Molecular Biology of the Cell}}, title = {{Interaction of the HOPS complex with Syntaxin 17 mediates autophagosome clearance in Drosophila}}, url = {{http://dx.doi.org/10.1091/mbc.E13-08-0449}}, doi = {{10.1091/mbc.E13-08-0449}}, volume = {{25}}, year = {{2014}}, }