Abstract
To compare kinetic properties of homologous isozymes of NADP +-specific isocitrate dehydrogenase, histidine-tagged forms of yeast mitochondrial (IDP1) and cytosolic (IDP2) enzymes were expressed and purified. The isozymes were found to share similar apparent affinities for cofactors. However, with respect to isocitrate, IDP1 had an apparent Km value ∼7-fold lower than that of IDP2, whereas, with respect to α-ketoglutarate, IDP2 had an apparent Km value ∼10-fold lower than that of IDP1. Similar Km values for substrates and cofactors in decarboxylation and carboxylation reactions were obtained for IDP2, suggesting a capacity for bidirectional catalysis in vivo. Concentrations of isocitrate and α-ketoglutarate measured in extracts from the parental strain were found to be similar with growth on different carbon sources. For mutant strains lacking IDP1, IDP2, and/or the mitochondrial NAD +-specific isocitrate dehydrogenase (IDH), metabolite measurements indicated that major cellular flux is through the IDH-catalyzed reaction in glucose-grown cells and through the IDP2-catalyzed reaction in cells grown with a nonfermentable carbon source (glycerol and lactate). A substantial cellular pool of α-ketoglutarate is attributed to IDH function during glucose growth, and to both IDP1 and IDH function during growth on glycerol/lactate. Complementation experiments using a strain lacking IDH demonstrated that overexpression of IDP1 partially compensated for the glutamate auxotrophy associated with loss of IDH. Collectively, these results suggest an ancillary role for IDP1 in cellular glutamate synthesis and a role for IDP2 in equilibrating and maintaining cellular levels of isocitrate and α-ketoglutarate.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 4469-4475 |
| Number of pages | 7 |
| Journal | Journal of Biological Chemistry |
| Volume | 280 |
| Issue number | 6 |
| DOIs | |
| State | Published - Feb 11 2005 |
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ASJC Scopus subject areas
- Biochemistry
Cite this
Kinetic properties and metabolic contributions of yeast mitochondrial and cytosolic NADP+-specific isocitrate dehydrogenases. / Contreras-Shannon, Veronica; Lin, An Ping; McCammon, Mark T.; McAlister-Henn, Lee.
In: Journal of Biological Chemistry, Vol. 280, No. 6, 11.02.2005, p. 4469-4475.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Kinetic properties and metabolic contributions of yeast mitochondrial and cytosolic NADP+-specific isocitrate dehydrogenases
AU - Contreras-Shannon, Veronica
AU - Lin, An Ping
AU - McCammon, Mark T.
AU - McAlister-Henn, Lee
PY - 2005/2/11
Y1 - 2005/2/11
N2 - To compare kinetic properties of homologous isozymes of NADP +-specific isocitrate dehydrogenase, histidine-tagged forms of yeast mitochondrial (IDP1) and cytosolic (IDP2) enzymes were expressed and purified. The isozymes were found to share similar apparent affinities for cofactors. However, with respect to isocitrate, IDP1 had an apparent Km value ∼7-fold lower than that of IDP2, whereas, with respect to α-ketoglutarate, IDP2 had an apparent Km value ∼10-fold lower than that of IDP1. Similar Km values for substrates and cofactors in decarboxylation and carboxylation reactions were obtained for IDP2, suggesting a capacity for bidirectional catalysis in vivo. Concentrations of isocitrate and α-ketoglutarate measured in extracts from the parental strain were found to be similar with growth on different carbon sources. For mutant strains lacking IDP1, IDP2, and/or the mitochondrial NAD +-specific isocitrate dehydrogenase (IDH), metabolite measurements indicated that major cellular flux is through the IDH-catalyzed reaction in glucose-grown cells and through the IDP2-catalyzed reaction in cells grown with a nonfermentable carbon source (glycerol and lactate). A substantial cellular pool of α-ketoglutarate is attributed to IDH function during glucose growth, and to both IDP1 and IDH function during growth on glycerol/lactate. Complementation experiments using a strain lacking IDH demonstrated that overexpression of IDP1 partially compensated for the glutamate auxotrophy associated with loss of IDH. Collectively, these results suggest an ancillary role for IDP1 in cellular glutamate synthesis and a role for IDP2 in equilibrating and maintaining cellular levels of isocitrate and α-ketoglutarate.
AB - To compare kinetic properties of homologous isozymes of NADP +-specific isocitrate dehydrogenase, histidine-tagged forms of yeast mitochondrial (IDP1) and cytosolic (IDP2) enzymes were expressed and purified. The isozymes were found to share similar apparent affinities for cofactors. However, with respect to isocitrate, IDP1 had an apparent Km value ∼7-fold lower than that of IDP2, whereas, with respect to α-ketoglutarate, IDP2 had an apparent Km value ∼10-fold lower than that of IDP1. Similar Km values for substrates and cofactors in decarboxylation and carboxylation reactions were obtained for IDP2, suggesting a capacity for bidirectional catalysis in vivo. Concentrations of isocitrate and α-ketoglutarate measured in extracts from the parental strain were found to be similar with growth on different carbon sources. For mutant strains lacking IDP1, IDP2, and/or the mitochondrial NAD +-specific isocitrate dehydrogenase (IDH), metabolite measurements indicated that major cellular flux is through the IDH-catalyzed reaction in glucose-grown cells and through the IDP2-catalyzed reaction in cells grown with a nonfermentable carbon source (glycerol and lactate). A substantial cellular pool of α-ketoglutarate is attributed to IDH function during glucose growth, and to both IDP1 and IDH function during growth on glycerol/lactate. Complementation experiments using a strain lacking IDH demonstrated that overexpression of IDP1 partially compensated for the glutamate auxotrophy associated with loss of IDH. Collectively, these results suggest an ancillary role for IDP1 in cellular glutamate synthesis and a role for IDP2 in equilibrating and maintaining cellular levels of isocitrate and α-ketoglutarate.
UR - http://www.scopus.com/inward/record.url?scp=14244262262&partnerID=8YFLogxK
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U2 - 10.1074/jbc.M410140200
DO - 10.1074/jbc.M410140200
M3 - Article
C2 - 15574419
AN - SCOPUS:14244262262
VL - 280
SP - 4469
EP - 4475
JO - Journal of Biological Chemistry
JF - Journal of Biological Chemistry
SN - 0021-9258
IS - 6
ER -