Molecular analysis of the yeast SER1 gene encoding 3-phosphoserine aminotransferase: regulation by general control and serine repression (original) (raw)

Abstract

Although serine and glycine are ubiquitous amino acids the genetic and biochemical regulation of their synthesis has not been studied in detail. The SER1 gene encodes 3-phosphoserine aminotransferase which catalyzes the formation of phosphoserine from 3-phosphohydroxypyruvate, which is obtained by oxidation of 3-phosphoglycerate, an intermediate of glycolysis. Saccharomyces cerevisiae cells provided with fermentable carbon sources mainly use this pathway (glycolytic pathway) to synthesize serine and glycine. We report the isolation of the SER1 gene by complementation and the disruption of the chromosomal locus. Sequence analysis revealed an open reading frame encoding a protein with a predicted molecular weight of 43 401 Da. A previously described mammalian progesterone-induced protein shares 47% similarity with SER1 over the entire protein, indicating a common function for both proteins. We demonstrate that SER1 transcription is regulated by the general control of amino-acid biosynthesis mediated by GCN4. Additionally, DNaseI protection experiments proved the binding of GCN4 protein to the SER1 promoter in vitro and three GCN4 recognition elements (GCREs) were identified. Furthermore, there is evidence for an additional regulation by serine end product repression.

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Author notes

1. Karsten Melcher
   Present address: University of Texas Southwestern Medical School, 75235, Dallas, Tx, USA

Authors and Affiliations

1. Institute for Microbiology, University of Frankfurt, Marie-Curie-Strasse 9, D-60439, Frankfurt/M, Germany
   Karsten Melcher, Matthias Rose & Karl-Dieter Entian
2. Institut für Biochemie, Staudtstrasse 5, D-91058, Erlangen, Germany
   Markus Künzler & Gerhard H. Braus

Authors

1. Karsten Melcher
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2. Matthias Rose
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3. Markus Künzler
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4. Gerhard H. Braus
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5. Karl-Dieter Entian
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Melcher, K., Rose, M., Künzler, M. et al. Molecular analysis of the yeast SER1 gene encoding 3-phosphoserine aminotransferase: regulation by general control and serine repression.Curr Genet 27, 501–508 (1995). https://doi.org/10.1007/BF00314439

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• Received: 02 December 1994
• Issue Date: May 1995
• DOI: https://doi.org/10.1007/BF00314439

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