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Microarray Analysis for Saccharomyces cerevisiae
Published on: April 7, 2011
Analysis of the yeast transcriptome with structural and functional categories: characterizing highly expressed
1Department of Molecular Biophysics and Biochemistry, 266 Whitney Avenue, Yale University, PO Box 208114, New Haven, CT 06520, USA.
Nucleic Acids Research
|February 24, 2000
Summary
This study reveals that highly expressed yeast proteins are enriched in specific amino acids and structural folds, particularly the TIM barrel, and linked to energy production and protein synthesis functions. These findings highlight key features of the yeast transcriptome compared to its genome.
Area of Science:
- * Genomics
- * Proteomics
- * Bioinformatics
Background:
- * The yeast transcriptome represents the set of all yeast genes, weighted by transcript abundance.
- * Different techniques like SAGE and gene chips generate diverse transcriptome data.
- * Understanding transcriptome features relative to the genome is crucial for biological insights.
Purpose of the Study:
- * To identify features prevalent in the yeast transcriptome compared to the genome.
- * To correlate protein expression levels with structural and functional categories.
- * To determine which protein folds and functional categories are enriched or depleted in the transcriptome.
Main Methods:
- * Analyzed 10 genome expression datasets using large-scale cross-referencing.
- * Compared transcriptome data against structural and functional categories.
- * Assigned transmembrane helices and known folds (using PSI-blast) to yeast proteins.
- * Utilized the MIPS (Munich Information center for Protein Sequence) system for functional categorization.
Main Results:
- * The transcriptome is enriched in Alanine (Ala) and Glycine (Gly), and depleted in Asparagine (Asn) and very long proteins.
- * Protein length shows an inverse relationship with maximum expression level.
- * Mixed alpha-beta structures are enriched, while membrane proteins are depleted in the transcriptome.
- * Enzymatic folds like TIM barrel and G3P dehydrogenase are more prevalent in the transcriptome; protein-kinase and leucine-zipper folds are depleted.
- * Functional categories like energy production and protein synthesis are highly enriched, while transcription, transport, and signaling are depleted.
- * Transcriptome enrichment for functional categories shows significant variation across different expression datasets.
Conclusions:
- * The yeast transcriptome exhibits distinct characteristics in terms of amino acid composition, protein structure, and functional roles compared to the genome.
- * The TIM barrel fold is a dominant feature of the highly expressed yeast proteome.
- * Functional enrichments in the transcriptome, such as energy production, are directly linked to the prevalence of specific protein folds.
- * Variations in transcriptome data highlight the complexity of gene expression analysis.
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