Coordination of autophagosome-lysosome fusion and transport by a Klp98A-Rab14 complex in Drosophila

Caroline C Mauvezin, Amanda L Neisch, Carlos I. Ayala, Jung Kim, Abigail Beltrame, Christopher R. Braden, Melissa K Gardner, Tom S Hays, Thomas P Neufeld

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Degradation of cellular material by autophagy is essential for cell survival and homeostasis, and requires intracellular transport of autophagosomes to encounter acidic lysosomes through unknown mechanisms. Here, we identify the PX-domain-containing kinesin Klp98A as a new regulator of autophagosome formation, transport and maturation in Drosophila. Depletion of Klp98A caused abnormal clustering of autophagosomes and lysosomes at the cell center and reduced the formation of starvation-induced autophagic vesicles. Reciprocally, overexpression of Klp98A redistributed autophagic vesicles towards the cell periphery. These effects were accompanied by reduced autophagosome-lysosome fusion and autophagic degradation. In contrast, depletion of the conventional kinesin heavy chain caused a similar mislocalization of autophagosomes without perturbing their fusion with lysosomes, indicating that vesicle fusion and localization are separable and independent events. Klp98Amediated fusion required the endolysosomal GTPase Rab14, which interacted and colocalized with Klp98A, and required Klp98A for normal localization. Thus, Klp98A coordinates the movement and fusion of autophagic vesicles by regulating their positioning and interaction with the endolysosomal compartment.

Original languageEnglish (US)
Pages (from-to)971-982
Number of pages12
JournalJournal of cell science
Volume129
Issue number5
DOIs
StatePublished - Jan 1 2016

Fingerprint

Lysosomes
Drosophila
Kinesin
GTP Phosphohydrolases
Autophagy
Starvation
Cluster Analysis
Cell Survival
Homeostasis
Autophagosomes

Keywords

  • Autophagy
  • Intracellular trafficking
  • Klp98A
  • Rab14

Cite this

Coordination of autophagosome-lysosome fusion and transport by a Klp98A-Rab14 complex in Drosophila. / Mauvezin, Caroline C; Neisch, Amanda L; Ayala, Carlos I.; Kim, Jung; Beltrame, Abigail; Braden, Christopher R.; Gardner, Melissa K; Hays, Tom S; Neufeld, Thomas P.

In: Journal of cell science, Vol. 129, No. 5, 01.01.2016, p. 971-982.

Research output: Contribution to journalArticle

Mauvezin, Caroline C ; Neisch, Amanda L ; Ayala, Carlos I. ; Kim, Jung ; Beltrame, Abigail ; Braden, Christopher R. ; Gardner, Melissa K ; Hays, Tom S ; Neufeld, Thomas P. / Coordination of autophagosome-lysosome fusion and transport by a Klp98A-Rab14 complex in Drosophila. In: Journal of cell science. 2016 ; Vol. 129, No. 5. pp. 971-982.
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