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A New Endogenous Overexpression System of Multidrug Transporters of Candida albicans Suitable for Structural and

Atanu Banerjee1, Nitesh K Khandelwal1, Dominique Sanglard2

  • 1Membrane Biology Laboratory, School of Life Sciences, Jawaharlal Nehru University New Delhi, India.

Frontiers in Microbiology
|March 15, 2016
PubMed

Insights

Researchers developed a new system in Candida albicans to study fungal multidrug transporters, overcoming limitations of previous methods. This system enhances understanding of drug resistance mechanisms in fungal pathogens.

Area of Science:

  • Mycology
  • Molecular Biology
  • Drug Discovery

Background:

  • Fungal pathogens utilize multidrug transporters to resist antifungal chemotherapy, posing a significant clinical challenge.
  • Previous overexpression systems using Saccharomyces cerevisiae for studying Candida albicans multidrug transporters had potential artifacts.
  • The need for an endogenous and artifact-free system for studying fungal drug transporters is critical.

Purpose of the Study:

  • To develop and validate a novel endogenous overexpression system in a clinical isolate of Candida albicans.
  • To facilitate the functional characterization of major multidrug transporters, Cdr1p and Mdr1p, in C. albicans.
  • To overcome limitations associated with heterologous expression systems for studying fungal drug efflux pumps.

Main Methods:

  • Developed a new C. albicans strain lacking major multidrug transporters (Cdr1p, Cdr2p, Mdr1p).
  • Utilized a hyperactive native CDR1 promoter with a TAC1 gain-of-function mutation for enhanced transporter expression.
  • Confirmed protein expression via confocal microscopy and immunodetection; assessed drug resistance to transporter substrates.

Main Results:

  • Successfully established an endogenous overexpression system in C. albicans devoid of major efflux pumps.
  • Overexpression of native Cdr1p and Mdr1p resulted in significantly increased resistance to their known substrates.
  • Validated the system's utility by successfully overexpressing and characterizing mutant variants of Cdr1p and Mdr1p.

Conclusions:

  • The newly developed endogenous system is highly effective for the functional characterization of C. albicans multidrug transporters.
  • This artifact-free system provides a more accurate platform for studying drug resistance mechanisms and transporter function.
  • The system is suitable for investigating native transporter proteins and their mutants, aiding in the development of new antifungal strategies.
Keywords:
Candida albicansCdr1pMdr1pTAC1 GOFendogenous overexpression systemmultidrug transporters

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