The effect of iron limitation on glycerol production and expression of the isogenes for NAD(+)-dependent glycerol 3-phosphate dehydrogenase in Saccharomyces cerevisiae. 1999

R Ansell, and L Adler
Department of Cell and Molecular Biology, Microbiology, University of Göteborg, Box 462, S-405 30, Göteborg, Sweden.

When deprived of iron, Saccharomyces cerevisiae rearranges its metabolic flux towards increased glycerol production. This work examines the role and regulation of GPD1 and GPD2, encoding two isoforms of glycerol 3-phosphate dehydrogenase, in glycerol production during iron starvation. The two genes respond differently on transfer of cells to iron-limited conditions. Whereas the expression of GPD2 increases about 3-fold, that of GPD1 does not exhibit significant changes. Deletion of either GPD1 or GPD2 alters the capacity for glycerol production during iron-limited as well as iron sufficient conditions. However, loss of function of either gene does not seem to provoke compensatory flux via the other gene product. As judged from the glycerol production, the amount produced by each single mutant adds approximately up to the level produced by the parental strain. In agreement with the pattern of expression of GPD2, this gene product was estimated to account for the bulk of the glycerol production (about 60%) during iron-limited conditions. The strong growth inhibition caused by iron starvation was reversed by the addition of iron also for a gpd1Deltagpd2Delta double deletion mutant, which is unable to produce any detectable glycerol.

UI MeSH Term Description Entries
D007501 Iron A metallic element with atomic symbol Fe, atomic number 26, and atomic weight 55.85. It is an essential constituent of HEMOGLOBINS; CYTOCHROMES; and IRON-BINDING PROTEINS. It plays a role in cellular redox reactions and in the transport of OXYGEN. Iron-56,Iron 56
D007527 Isoenzymes Structurally related forms of an enzyme. Each isoenzyme has the same mechanism and classification, but differs in its chemical, physical, or immunological characteristics. Alloenzyme,Allozyme,Isoenzyme,Isozyme,Isozymes,Alloenzymes,Allozymes
D009243 NAD A coenzyme composed of ribosylnicotinamide 5'-diphosphate coupled to adenosine 5'-phosphate by pyrophosphate linkage. It is found widely in nature and is involved in numerous enzymatic reactions in which it serves as an electron carrier by being alternately oxidized (NAD+) and reduced (NADH). (Dorland, 27th ed) Coenzyme I,DPN,Diphosphopyridine Nucleotide,Nadide,Nicotinamide-Adenine Dinucleotide,Dihydronicotinamide Adenine Dinucleotide,NADH,Adenine Dinucleotide, Dihydronicotinamide,Dinucleotide, Dihydronicotinamide Adenine,Dinucleotide, Nicotinamide-Adenine,Nicotinamide Adenine Dinucleotide,Nucleotide, Diphosphopyridine
D005800 Genes, Fungal The functional hereditary units of FUNGI. Fungal Genes,Fungal Gene,Gene, Fungal
D005947 Glucose A primary source of energy for living organisms. It is naturally occurring and is found in fruits and other parts of plants in its free state. It is used therapeutically in fluid and nutrient replacement. Dextrose,Anhydrous Dextrose,D-Glucose,Glucose Monohydrate,Glucose, (DL)-Isomer,Glucose, (alpha-D)-Isomer,Glucose, (beta-D)-Isomer,D Glucose,Dextrose, Anhydrous,Monohydrate, Glucose
D005990 Glycerol A trihydroxy sugar alcohol that is an intermediate in carbohydrate and lipid metabolism. It is used as a solvent, emollient, pharmaceutical agent, or sweetening agent. 1,2,3-Propanetriol,Glycerin,1,2,3-Trihydroxypropane,Glycerine
D005993 Glycerolphosphate Dehydrogenase Alpha-Glycerophosphate Dehydrogenase,Glycerol-3-Phosphate Dehydrogenase,Glycerophosphate Dehydrogenase,Glycerophosphate Oxidase,Alpha Glycerophosphate Dehydrogenase,Dehydrogenase, Alpha-Glycerophosphate,Dehydrogenase, Glycerol-3-Phosphate,Dehydrogenase, Glycerolphosphate,Dehydrogenase, Glycerophosphate,Glycerol 3 Phosphate Dehydrogenase,Oxidase, Glycerophosphate
D006019 Glycolysis A metabolic process that converts GLUCOSE into two molecules of PYRUVIC ACID through a series of enzymatic reactions. Energy generated by this process is conserved in two molecules of ATP. Glycolysis is the universal catabolic pathway for glucose, free glucose, or glucose derived from complex CARBOHYDRATES, such as GLYCOGEN and STARCH. Embden-Meyerhof Pathway,Embden-Meyerhof-Parnas Pathway,Embden Meyerhof Parnas Pathway,Embden Meyerhof Pathway,Embden-Meyerhof Pathways,Pathway, Embden-Meyerhof,Pathway, Embden-Meyerhof-Parnas,Pathways, Embden-Meyerhof
D012441 Saccharomyces cerevisiae A species of the genus SACCHAROMYCES, family Saccharomycetaceae, order Saccharomycetales, known as "baker's" or "brewer's" yeast. The dried form is used as a dietary supplement. Baker's Yeast,Brewer's Yeast,Candida robusta,S. cerevisiae,Saccharomyces capensis,Saccharomyces italicus,Saccharomyces oviformis,Saccharomyces uvarum var. melibiosus,Yeast, Baker's,Yeast, Brewer's,Baker Yeast,S cerevisiae,Baker's Yeasts,Yeast, Baker
D015966 Gene Expression Regulation, Fungal Any of the processes by which nuclear, cytoplasmic, or intercellular factors influence the differential control of gene action in fungi. Fungal Gene Expression Regulation,Regulation of Gene Expression, Fungal,Regulation, Gene Expression, Fungal

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