Author: Yun Zheng
Publisher:
ISBN:
Category : Gene expression
Languages : en
Pages : 0
Book Description
The glycine cleavage system (GCS) is a multienzyme complex containing four proteins. The GCS, which is important for the growth and viability of organisms ranging from bacteria to humans, catalyses the oxidative cleavage of glycine into CO 2 and NH 3 . Concomitantly it generates the C1-donor 5,10-methylenetetrahydrofolate and the electron donor NADH. NH 3 is an important precursor for cellular nitrogen metabolism. The C1-donor 5,10-methylenetetrahydrofolate is a precursor for the biosynthesis of C1-end products such as adenine, thymidylate, serine and methionine. The goal of my research was to study the regulatory mechanisms controlling GCS activity. The expression of GCV3, a yeast gene that codes for one of the four GCS subunits, was analyzed in detail. This revealed that GCV3 expression is regulated by the availability of glycine, and cellular demand for the metabolic products of glycine cleavage. 10 mM glycine in minimal medium (SD) induced GCV3 expression about 4-fold. Supplementing with the C1-metabolic end products repressed GCV3 expression about 3-fold. Both glycine induction and repression by the C1-end products were found to be Bas1p-dependent. The upstream promoter elements required for regulation by Bas1p were localized. Expression of GCV3 is also subject to the general control system in a Gcn4p-dependent fashion. The elements utilized by Gcn4p have been characterized. A GATAA sequence located at -167bp upstream of the start codon is used by the nitrogen regulation system. Gcr1p, a transcription activator for glycolytic genes, is involved in regulating GCV3 in the presence of glucose. Evidences are also presented for an as yet unidentified regulator that represses expression in SD. Additional results presented in this thesis suggest that Rap1p, Nil1p, Ure2p and Deb1p also regulate GCV3.
Regulation of the GCV3 Gene in Saccharomyces Cerevisiae
Author: Yun Zheng
Publisher:
ISBN:
Category : Gene expression
Languages : en
Pages : 0
Book Description
The glycine cleavage system (GCS) is a multienzyme complex containing four proteins. The GCS, which is important for the growth and viability of organisms ranging from bacteria to humans, catalyses the oxidative cleavage of glycine into CO 2 and NH 3 . Concomitantly it generates the C1-donor 5,10-methylenetetrahydrofolate and the electron donor NADH. NH 3 is an important precursor for cellular nitrogen metabolism. The C1-donor 5,10-methylenetetrahydrofolate is a precursor for the biosynthesis of C1-end products such as adenine, thymidylate, serine and methionine. The goal of my research was to study the regulatory mechanisms controlling GCS activity. The expression of GCV3, a yeast gene that codes for one of the four GCS subunits, was analyzed in detail. This revealed that GCV3 expression is regulated by the availability of glycine, and cellular demand for the metabolic products of glycine cleavage. 10 mM glycine in minimal medium (SD) induced GCV3 expression about 4-fold. Supplementing with the C1-metabolic end products repressed GCV3 expression about 3-fold. Both glycine induction and repression by the C1-end products were found to be Bas1p-dependent. The upstream promoter elements required for regulation by Bas1p were localized. Expression of GCV3 is also subject to the general control system in a Gcn4p-dependent fashion. The elements utilized by Gcn4p have been characterized. A GATAA sequence located at -167bp upstream of the start codon is used by the nitrogen regulation system. Gcr1p, a transcription activator for glycolytic genes, is involved in regulating GCV3 in the presence of glucose. Evidences are also presented for an as yet unidentified regulator that represses expression in SD. Additional results presented in this thesis suggest that Rap1p, Nil1p, Ure2p and Deb1p also regulate GCV3.
Publisher:
ISBN:
Category : Gene expression
Languages : en
Pages : 0
Book Description
The glycine cleavage system (GCS) is a multienzyme complex containing four proteins. The GCS, which is important for the growth and viability of organisms ranging from bacteria to humans, catalyses the oxidative cleavage of glycine into CO 2 and NH 3 . Concomitantly it generates the C1-donor 5,10-methylenetetrahydrofolate and the electron donor NADH. NH 3 is an important precursor for cellular nitrogen metabolism. The C1-donor 5,10-methylenetetrahydrofolate is a precursor for the biosynthesis of C1-end products such as adenine, thymidylate, serine and methionine. The goal of my research was to study the regulatory mechanisms controlling GCS activity. The expression of GCV3, a yeast gene that codes for one of the four GCS subunits, was analyzed in detail. This revealed that GCV3 expression is regulated by the availability of glycine, and cellular demand for the metabolic products of glycine cleavage. 10 mM glycine in minimal medium (SD) induced GCV3 expression about 4-fold. Supplementing with the C1-metabolic end products repressed GCV3 expression about 3-fold. Both glycine induction and repression by the C1-end products were found to be Bas1p-dependent. The upstream promoter elements required for regulation by Bas1p were localized. Expression of GCV3 is also subject to the general control system in a Gcn4p-dependent fashion. The elements utilized by Gcn4p have been characterized. A GATAA sequence located at -167bp upstream of the start codon is used by the nitrogen regulation system. Gcr1p, a transcription activator for glycolytic genes, is involved in regulating GCV3 in the presence of glucose. Evidences are also presented for an as yet unidentified regulator that represses expression in SD. Additional results presented in this thesis suggest that Rap1p, Nil1p, Ure2p and Deb1p also regulate GCV3.
Molecular Characterization and Transcriptional Regulation of GCV3, the Saccharomyces Cerevisiae Gene Encoding the H-protein of the Glycine Cleavage System
Author: Nagarajan Lakshmanan
Publisher:
ISBN:
Category : Genetic regulation
Languages : en
Pages : 0
Book Description
YAL044, a gene on the left arm of Saccharomyces cerevisiae chromosome one, is shown to code for the H-protein subunit of the multienzyme glycine cleavage system. The gene designation has therefore been changed from YAL044 to GCV3 to reflect its role in the glycine cleavage system. GCV3 encodes a 177 amino acid residue protein with a putative mitochondrial targeting sequence at its amino terminus. Targeted gene replacement shows that GCV3 is not essential for growth on minimal media. It is, however, essential for growth when glycine serves as the sole nitrogen source. Studies of GCV3 expression revealed that it is highly regulated. Supplement with glycine, the glycine cleavage system's substrate, induced expression at least 30-fold. In contrast, addition of the C1-metabolic end products repressed expression about 10-fold. The regulation of glycine cleavage system activity reflects the availability of glycine and the cellular demand for its metabolic products. In addition the glycine cleavage system has been shown to be important for the growth and viability of organisms ranging from microorganisms such as E. coli and S. cerevisiae to humans. Although, this system is important and its activity highly regulated little was known about the transcriptional regulatory mechanisms that control its activity. To address this I have examined the transcriptional regulation of the S. cerevisiae GCV3 gene. The results presented here show that at least six different transcriptional activators control GCV3 expression. These include: an as yet unidentified activator that is partially responsible for its induction by glycine; Gcn4p the transcriptional activator that mediates general amino acid control; Gln3p which is involved in the activation of nitrogen regulated genes; Gcr1p, a transcription factor important for the expression of glycolytic genes; Bas1p/Bas2p which cooperatively mediates the glycine-dependent expression; and an as yet unidentified factor that represses expression regardless of the growth condition. Additional evidence suggests that Rap1p, Nil1p, Acr1p, Ure2p, and Da180p also regulate GCV3 regulation.
Publisher:
ISBN:
Category : Genetic regulation
Languages : en
Pages : 0
Book Description
YAL044, a gene on the left arm of Saccharomyces cerevisiae chromosome one, is shown to code for the H-protein subunit of the multienzyme glycine cleavage system. The gene designation has therefore been changed from YAL044 to GCV3 to reflect its role in the glycine cleavage system. GCV3 encodes a 177 amino acid residue protein with a putative mitochondrial targeting sequence at its amino terminus. Targeted gene replacement shows that GCV3 is not essential for growth on minimal media. It is, however, essential for growth when glycine serves as the sole nitrogen source. Studies of GCV3 expression revealed that it is highly regulated. Supplement with glycine, the glycine cleavage system's substrate, induced expression at least 30-fold. In contrast, addition of the C1-metabolic end products repressed expression about 10-fold. The regulation of glycine cleavage system activity reflects the availability of glycine and the cellular demand for its metabolic products. In addition the glycine cleavage system has been shown to be important for the growth and viability of organisms ranging from microorganisms such as E. coli and S. cerevisiae to humans. Although, this system is important and its activity highly regulated little was known about the transcriptional regulatory mechanisms that control its activity. To address this I have examined the transcriptional regulation of the S. cerevisiae GCV3 gene. The results presented here show that at least six different transcriptional activators control GCV3 expression. These include: an as yet unidentified activator that is partially responsible for its induction by glycine; Gcn4p the transcriptional activator that mediates general amino acid control; Gln3p which is involved in the activation of nitrogen regulated genes; Gcr1p, a transcription factor important for the expression of glycolytic genes; Bas1p/Bas2p which cooperatively mediates the glycine-dependent expression; and an as yet unidentified factor that represses expression regardless of the growth condition. Additional evidence suggests that Rap1p, Nil1p, Acr1p, Ure2p, and Da180p also regulate GCV3 regulation.
Coordinate Regulation of Glycolytic Gene Expression in Saccharomyces Cerevisiae
Author: Chang Seo Park
Publisher:
ISBN:
Category :
Languages : en
Pages : 384
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 384
Book Description
Global Regulation of Gene Expression in Saccharomyces Cerevisiae Via TATA Binding Protein Regulatory Factors
Author: Kathryn L. Huisinga
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Regulation of Expression of a Gene for Glycogen Synthases in Saccharomyces Cerevisiae
Author: Marilyn H. Meinke
Publisher:
ISBN:
Category :
Languages : en
Pages : 184
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 184
Book Description
Insights Into the Molecular Genetics of Hexose Transporter Gene Regulation in Saccharomyces Cerevisiae
Author: Kevin L. Dietzel
Publisher:
ISBN:
Category :
Languages : en
Pages : 336
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 336
Book Description
Regulation of Gene Expression and Adhesion in Saccharomyces Cerevisiae
Author: Malte Kleinschmidt
Publisher:
ISBN:
Category :
Languages : en
Pages : 130
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 130
Book Description
Regulation and Transposition of Cryptic Mating Type Genes in Saccharomyces Cerevisiae
Author: Jasper Donald Rine
Publisher:
ISBN:
Category : Saccharomyces cerevisiae
Languages : en
Pages : 530
Book Description
Publisher:
ISBN:
Category : Saccharomyces cerevisiae
Languages : en
Pages : 530
Book Description
The Regulation of Expression of Sporulation-specific Genes in Saccharomyces Cerevisiae
Author: Brian Lee Holaway
Publisher:
ISBN:
Category :
Languages : en
Pages : 270
Book Description
Publisher:
ISBN:
Category :
Languages : en
Pages : 270
Book Description
Gene Regulation in Saccharomyces Cerevisiae
Author: Helen Jeanneane McBride
Publisher:
ISBN:
Category : Genetic regulation
Languages : en
Pages : 600
Book Description
Publisher:
ISBN:
Category : Genetic regulation
Languages : en
Pages : 600
Book Description