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Metabolic stress regulates basic transcription through acetyl-coenzyme A
1Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts, 02215, USA.
Cellular and Molecular Life Sciences : CMLS
|March 17, 2005
Summary
Metabolic stress, like fasting and aging, alters transcription factor IIB (TFIIB) acetylation. This suggests acetyl-coenzyme A availability directly regulates gene transcription in eukaryotes.
Area of Science:
- Molecular Biology
- Metabolic Regulation
- Gene Transcription
Background:
- Acetylation of general transcription factors is known, but its functional role remains unclear.
- Acetyl-coenzyme A activates basal transcription, and TFIIB acetylation enhances this process.
- Metabolic states, such as fasting and aging, impact acetyl-coenzyme A levels.
Purpose of the Study:
- To investigate the functional significance of transcription factor acetylation in response to metabolic stress.
- To explore the link between acetyl-coenzyme A, transcription factor modifications, and gene regulation.
Main Methods:
- Analysis of tissue-specific acetylated TFIIB levels in mice under fasting conditions.
- Comparison of acetyl-TFIIB levels in young versus aged mice.
- Consideration of Sir2 family deacetylases' role in acetyl-coenzyme A synthesis and longevity.
Main Results:
- Tissue-specific acetylated TFIIB levels significantly changed in response to fasting in mice.
- A notable increase in acetyl-TFIIB was observed in aged mice compared to younger mice.
- These findings suggest a direct role for metabolism in regulating transcription.
Conclusions:
- Metabolic status, influenced by factors like fasting and aging, directly impacts transcription factor acetylation.
- The availability of acetyl-coenzyme A is a key regulator of transcription through its action on transcription factors.
- Protein acetylation and Sir2-mediated deacetylation may be integral to the metabolic control of gene expression.