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Nat Commun. 2015 Jul 30;6:7888. doi: 10.1038/ncomms8888.

Actin nucleation by WH2 domains at the autophagosome.

Author information

1
Laboratory of Cancer Biology, Department of Oncology, Medical Sciences Division, University of Oxford, Old Road Campus Research Building, Old Road Campus, off Roosevelt Drive, Oxford OX3 7DQ, UK.

Abstract

Autophagy is a catabolic process whereby cytosolic components and organelles are degraded to recycle key cellular materials. It is a constitutive process required for proper tissue homoeostasis but can be rapidly regulated by a variety of stimuli (for example, nutrient starvation and chemotherapeutic agents). JMY is a DNA damage-responsive p53 cofactor and actin nucleator important for cell survival and motility. Here we show that JMY regulates autophagy through its actin nucleation activity. JMY contains an LC3-interacting region, which is necessary to target JMY to the autophagosome where it enhances the autophagy maturation process. In autophagosomes, the integrity of the WH2 domains allows JMY to promote actin nucleation, which is required for efficient autophagosome formation. Thus our results establish a direct role for actin nucleation mediated by WH2 domain proteins that reside at the autophagosome.

PMID:
26223951
PMCID:
PMC4532831
DOI:
10.1038/ncomms8888
[Indexed for MEDLINE]
Free PMC Article

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