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Nitrogen regulation in Saccharomyces cerevisiae
Boris Magasanik1, Chris A Kaiser
1Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. bmag@mit.edu
Gene
|June 14, 2002
Summary
Yeast nitrogen regulation involves specific transcription factors and permease activity. This review details the regulatory networks controlling gene expression and amino acid uptake in response to nitrogen availability.
Area of Science:
- Molecular Biology
- Cell Biology
- Biochemistry
Background:
- Yeast cells adapt to poor nitrogen sources by upregulating enzymes for glutamate/glutamine synthesis and amino acid permease activity.
- These adaptive responses are collectively known as nitrogen regulation, crucial for nutrient utilization.
Purpose of the Study:
- To review the historical and current understanding of yeast nitrogen regulation.
- To elucidate the regulatory networks governing gene expression and nutrient uptake.
Main Methods:
- Focus on the roles of four GATA transcription factors (Gln3p, Nil1p, Nil2p, Dal80p) in regulating nitrogen-responsive genes.
- Examine the DNA elements targeted by these transcription factors and their nuclear translocation.
- Investigate the ubiquitin-mediated regulation of amino acid permeases (Gap1p, Put4p) via intracellular sorting pathways.
Main Results:
- Identified four GATA transcription factors (Gln3p, Nil1p, Nil2p, Dal80p) as key regulators of nitrogen-controlled genes.
- Described the DNA targets and regulated cytoplasmic-to-nuclear translocation of Gln3p and Nil1p.
- Detailed the ubiquitin-mediated sorting of Gap1p and Put4p in the secretory and endosomal pathways as a mechanism for nitrogen regulation.
Conclusions:
- Yeast nitrogen regulation is a complex process involving intricate transcription factor networks and protein sorting mechanisms.
- Understanding these pathways provides insights into cellular adaptation to nutrient availability and metabolic control.