期刊
AUTOPHAGY
卷 9, 期 11, 页码 1818-1827出版社
TAYLOR & FRANCIS INC
DOI: 10.4161/auto.26057
关键词
MoAtg24; conidiation; foot cell; mitophagy; Magnaporthe oryzae; reactive oxygen species; redox; sorting nexin
类别
资金
- Temasek Life Sciences Laboratory
- Temasek Foundation
Macroautophagy-mediated glycogen catabolism is required for asexual differentiation in the blast fungus, Magnaporthe oryzae. However, the function(s) of selective subtypes of autophagy has not been studied therein. Here, we report that mitophagy, selective autophagic delivery of mitochondria to the vacuoles for degradation, occurs during early stages of Magnaporthe conidiation. Specifically, mitophagy was evident in the foot cells while being undetectable in aerial hyphae and/or conidiophores. We show that loss of MoAtg24, a sorting nexin related to yeast Snx4, disrupts mitophagy and consequently leads to highly reduced conidiation, suggesting that mitophagy in the foot cells plays an important role during asexual development in Magnaporthe. Ectopic expression of yeast ScATG32 partially suppressed the conidiation initiation defects associated with MoATG24 deletion. MoAtg24 was neither required for pexophagy nor for macroautophagy, or for MoAtg8 localization per se, but directly associated with and likely recruited mitochondria to the autophagic structures during mitophagy. Lastly, MoAtg24 was also required for oxidative stress response in Magnaporthe.
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