Autophagy deficiency promotes beta-lactam production in Penicillium chrysogenum

Area of Science:

• Molecular Biology
• Mycology
• Biotechnology

Background:

• Penicillin (PEN) production in Penicillium chrysogenum is a key biotechnological process.
• PEN biosynthesis occurs in both the cytosol and peroxisomes.
• Autophagy, a cellular degradation process, is active under PEN-producing conditions.

Purpose of the Study:

• To investigate the role of autophagy in penicillin production.
• To understand the impact of autophagy on Penicillium chrysogenum cell physiology.
• To explore the relationship between autophagy, cell degeneration, and antibiotic yield.

Main Methods:

• Utilized electron and fluorescence microscopy for morphological analysis.
• Generated a knockout mutant of the atg1 gene in P. chrysogenum.
• Quantified protein degradation, cell degeneration rates, and penicillin levels.

Main Results:

• Significant degradation of cytosolic and peroxisomal proteins via autophagy was observed.
• Autophagy contributes to the deterioration of late subapical cells.
• Deletion of atg1 impaired autophagy, delayed cell degeneration, and increased penicillin production.

Conclusions:

• Autophagy plays a regulatory role in penicillin production.
• Inhibition of autophagy can enhance antibiotic yields by delaying cell death and increasing enzyme levels.
• Targeting autophagy presents a potential strategy for improving penicillin biosynthesis.