Identification and Characterization of an Autophagy-Related Gene Acatg12 in Acremonium chrysogenum
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Autophagy is a highly conserved mechanism to overcome various stresses and recycle cytoplasmic components and organelles. Ubiquitin-like (UBL) protein Atg12 is a key protein involved in autophagosome formation through stimulation of Atg8 conjugation to phosphatidylethanolamine. Here, we describe the identification of the autophagy-related gene Acatg12, encoding an Atg12 homologous protein in the cephalosporin C producing fungus Acremonium chrysogenum. Disruption of Acatg12 impaired the delivery and degradation of eGFP-Atg8, indicating that the autophagic process was blocked. Meanwhile, conidiation was dramatically reduced in the Acatg12 disruption mutant (∆Acatg12). In contrast, cephalosporin C production was increased twofold in ∆Acatg12, but fungal growth was reduced after 6 days fermentation. Consistent with these results, the transcriptional level of the cephalosporin biosynthetic genes was increased in ∆Acatg12. The results extend our understanding of autophagy in filamentous fungi.
We are grateful to Prof. Juan F. Martín (Universidad de León, Spain) for providing the plasmid pJL43-RNAi. We thank Prof. Seogchan Kang (Penn State University, USA) and Prof. Xingzhong Liu (Institute of Microbiology, CAS) for providing plasmid pAg1-H3. This work was supported by grants from the National Natural Science Foundation of China (31670091) and Construction of the Registry and Database of Bioparts for Synthetic Biology of the Chinese Academy of Sciences (ZSYS-016).
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Conflict of interest
The authors declare that they have no conflict of interest.
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