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Over-expression of Candida albicans mitochondrial ribosomal protein S9 (MrpS9p) disturbs mitochondrial function in
C Wiltshire1, S Black, A J Brown
1Department of Molecular and Cell Biology, University of Aberdeen, U.K.
Abstract:
A Candida albicans mitochondrial ribosomal protein S9 (MRPS9) cDNA was identified in a screen for sequences whose expression induce galactose lethality in Saccharomyces cerevisiae. MRPS9 appears to encode a protein of 346 amino acids with an N-terminal mitochondrial targeting sequence and an internal S9 signature that is conserved amongst eukaryotic mitochondrial and prokaryotic ribosomal protein S9 sequences. Expression of a GAL1-CaMRPS9 fusion in S. cerevisiae caused the slow development of a galactose-negative phenotype upon repeated subculturing, and this correlated with an increased frequency of petite mutant formation. Therefore, over-expression of CaMRPS9 interferes with S. cerevisiae mitochondrial function, which accounts for the inhibition of growth on galactose.
Insights
Overexpressing Candida albicans mitochondrial ribosomal protein S9 (MRPS9) in yeast disrupts mitochondrial function, leading to growth inhibition on galactose medium. This suggests MRPS9 plays a critical role in maintaining yeast mitochondrial health.
Area of Science:
- * Molecular Biology
- * Genetics
- * Biochemistry
Background:
- * The study investigates the function of Candida albicans mitochondrial ribosomal protein S9 (CaMRPS9).
- * Mitochondrial ribosomal proteins are essential for protein synthesis within mitochondria.
- * Understanding CaMRPS9 function can shed light on mitochondrial biogenesis and cellular respiration.
Purpose of the Study:
- * To identify genes that cause galactose lethality when overexpressed in Saccharomyces cerevisiae.
- * To characterize the function of the identified Candida albicans mitochondrial ribosomal protein S9 (CaMRPS9).
- * To investigate the impact of CaMRPS9 overexpression on yeast mitochondrial function and growth.
Main Methods:
- * Screening for genes inducing galactose lethality in Saccharomyces cerevisiae.
- * Cloning and expression of Candida albicans MRPS9 (CaMRPS9) in S. cerevisiae.
- * Assessing growth phenotypes on galactose medium and monitoring petite mutant formation.
Main Results:
- * Overexpression of CaMRPS9 induced a slow galactose-negative phenotype in S. cerevisiae.
- * CaMRPS9 overexpression correlated with an increased frequency of petite mutant formation.
- * The CaMRPS9 protein contains a conserved S9 signature and a mitochondrial targeting sequence.
Conclusions:
- * Overexpression of CaMRPS9 interferes with Saccharomyces cerevisiae mitochondrial function.
- * This interference leads to the inhibition of growth on galactose-containing media.
- * CaMRPS9 is implicated in maintaining mitochondrial integrity and function in yeast.