Expression plasmids for use in Candida glabrata

Area of Science:

• Microbiology
• Molecular Biology
• Yeast Genetics

Background:

• Candida glabrata is an important human pathogen requiring robust genetic tools for research.
• Existing expression vectors for C. glabrata have limitations in promoter diversity and selectable markers.
• Developing novel plasmids is crucial for advancing functional studies and therapeutic target identification in C. glabrata.

Purpose of the Study:

• To create and characterize a novel set of CEN/ARS episomal plasmids for Candida glabrata.
• To provide a range of constitutive, induced, and regulated promoters for controlled gene expression.
• To expand the available molecular toolkit for C. glabrata research.

Main Methods:

• Cloning of six distinct Candida glabrata promoters (EGD2pr, HHT2pr, PDC1pr, ACO2pr, LYS21pr, MET3pr) into two plasmid backbones.
• Utilizing two selectable markers: URA3 and NAT1 (nourseothricin resistance).
• Assessing expression levels using Green Fluorescent Protein (GFP) as a reporter via flow cytometry and quantitative reverse-transcription polymerase chain reaction (qRT-PCR).

Main Results:

• Successfully generated 12 unique CEN/ARS episomal plasmids with diverse promoter elements.
• Validated the functionality of each promoter-plasmid combination using GFP reporter assays.
• Demonstrated varying expression levels across different promoters and selectable markers, suitable for different research needs.

Conclusions:

• The developed set of plasmids offers a versatile platform for gene expression in Candida glabrata.
• These new tools significantly enhance the capabilities for studying gene function and regulation in C. glabrata.
• The expanded plasmid toolkit will facilitate further research into C. glabrata biology and pathogenesis.