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ECM17-dependent methionine/cysteine biosynthesis contributes to biofilm formation in Candida albicans

De-Dong Li1, Yan Wang, Bao-Di Dai

  • 1School of Pharmacy, Second Military Medical University, Shanghai 200433, China.

Fungal Genetics and Biology : FG & B
|December 19, 2012
PubMed

Insights

Disrupting the ECM17 gene in Candida albicans impairs methionine/cysteine biosynthesis and significantly reduces biofilm formation and adhesion. This highlights the crucial role of this pathway in fungal virulence.

Area of Science:

  • Medical Mycology
  • Molecular Biology
  • Biochemistry

Background:

  • Candida albicans is a leading cause of nosocomial infections, often forming biofilms on medical devices.
  • Methionine/cysteine biosynthesis genes are upregulated during C. albicans biofilm formation.

Purpose of the Study:

  • To investigate the role of the methionine/cysteine biosynthesis pathway, specifically the ECM17 gene, in C. albicans biofilm formation and virulence.
  • To elucidate the relationship between ECM17, methionine/cysteine metabolism, and the cAMP-protein kinase A (PKA) pathway.

Main Methods:

  • Gene disruption of ECM17 in C. albicans to create an ecm17Δ/Δ mutant.
  • Assessing mutant growth in media with varying methionine/cysteine and H2S (NaSH) concentrations.
  • Evaluating biofilm formation, adhesion, and filamentation of the mutant.
  • Analyzing the expression of virulence genes (ALS3, CSH1, HWP1, ECE1) and the cAMP-PKA pathway.

Main Results:

  • The ecm17Δ/Δ mutant failed to produce H2S and exhibited poor growth without methionine/cysteine, which was rescued by NaSH.
  • ECM17 expression was downregulated by methionine/cysteine supply.
  • The ecm17Δ/Δ mutant showed reduced biofilm formation, adhesion, and filamentation, particularly under nutrient-limited conditions.
  • ECM17 disruption affected the expression of ALS3, CSH1, HWP1, and ECE1, and was linked to the cAMP-PKA pathway.

Conclusions:

  • ECM17 is essential for methionine/cysteine biosynthesis in C. albicans.
  • The methionine/cysteine biosynthesis pathway, regulated by ECM17, plays a significant role in C. albicans biofilm formation, adhesion, and filamentation.
  • ECM17 and methionine/cysteine metabolism are connected to the cAMP-PKA pathway, influencing fungal virulence.

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