A method for the re-isolation of an autonomously replicating plasmid from Aspergillus transformants

Area of Science:

• Molecular Biology
• Mycology
• Genetic Engineering

Background:

• Autonomously replicating plasmids are crucial for enhancing transformation efficiency in Aspergillus species.
• Efficient recovery of these plasmids from transformants is essential for their construction and application.

Purpose of the Study:

• To develop a rapid and efficient method for re-isolating autonomously replicating plasmids from Aspergillus transformants.
• To facilitate the construction of improved plasmids for Aspergillus transformation.

Main Methods:

• Aspergillus transformants were cultured in MM medium under selective pressure.
• Cell wall lytic enzyme (Yatalase) was used to generate protoplasts.
• Protoplasts were lysed, and DNA was purified using phenol/chloroform and ethanol precipitation.
• RNaseA treatment, PEG precipitation, and transformation of E. coli were employed for plasmid re-isolation.

Main Results:

• A rapid method for re-isolating autonomously replicating plasmids was successfully established.
• The re-isolated plasmids were predominantly in their monomeric form.
• This method enables the recovery and potential reuse of functional plasmids.

Conclusions:

• The developed method provides a quick way to obtain autonomously replicating plasmids from Aspergillus transformants.
• This technique is valuable for improving Aspergillus transformation protocols and genetic manipulation.
• The ability to re-isolate plasmids supports further research and application in fungal biotechnology.