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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Cell+Biol
2016 ; 215
(6
): 857-874
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Atg8 family LC3/GABARAP proteins are crucial for autophagosome-lysosome fusion
but not autophagosome formation during PINK1/Parkin mitophagy and starvation
#MMPMID27864321
Nguyen TN
; Padman BS
; Usher J
; Oorschot V
; Ramm G
; Lazarou M
J Cell Biol
2016[Dec]; 215
(6
): 857-874
PMID27864321
show ga
Members of the Atg8 family of proteins are conjugated to autophagosomal
membranes, where they have been proposed to drive autophagosome formation and
selective sequestration of cargo. In mammals, the Atg8 family consists of six
members divided into the LC3 and GABARAP subfamilies. To define Atg8 function, we
used genome editing to generate knockouts of the LC3 and GABARAP subfamilies as
well as all six Atg8 family members in HeLa cells. We show that Atg8s are
dispensable for autophagosome formation and selective engulfment of mitochondria,
but essential for autophagosome-lysosome fusion. We find that the GABARAP
subfamily promotes PLEKHM1 recruitment and governs autophagosome-lysosome fusion,
whereas the LC3 subfamily plays a less prominent role in these processes.
Although neither GABARAPs nor LC3s are required for autophagosome biogenesis,
loss of all Atg8s yields smaller autophagosomes and a slowed initial rate of
autophagosome formation. Our results clarify the essential function of the Atg8
family and identify GABARAP subfamily members as primary contributors to
PINK1/Parkin mitophagy and starvation autophagy.
|*Membrane Fusion
[MESH]
|*Mitophagy
[MESH]
|Acids/metabolism
[MESH]
|Adaptor Proteins, Signal Transducing/*metabolism
[MESH]
|Apoptosis Regulatory Proteins
[MESH]
|Autophagosomes/*metabolism/ultrastructure
[MESH]
|Autophagy-Related Protein 8 Family/*metabolism
[MESH]