Purification and kinetic properties of phosphofructokinase from Rana ridibunda erythrocytes

M. Kaloyianni*, K. Kotinis, E. G. Gounaris

*Corresponding author for this work

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Phosphofructokinase (PFK) from Rana ridibunda erythrocytes was purified about 570-fold by column chromatography on Cibacron Blue Sepharose. The resulting enzyme preparation had a specific activity of 1.94 U/mg protein and a pH maximum of 7.6. The molecular weight as determined by HPLC chromatography was 330,000 Da. The S0.5 value for fructose-6-phosphate (F6P) was 5.6 mM and the Km for ATP 0.87 mM. The enzyme was sensitive to inhibition by ATP which was increased with lower F6P concentrations. At physiological levels of 2,3-diphosphoglycerate (0.35 μmol/ml RBC), 20% of PFK activity was inhibited. Significant activations under cellular conditions were exercised by AMP and, to a lesser extent, by P1. Micromolar concentrations of fructose-2,6-bisphosphate and glucose-1,6-bisphosphate were also potent activators of the erythrocyte enzyme. Fructose-1,6-bisphosphate (10-50) μM activated the enzyme to a limited extent. With respect to these effects, it is suggested that PFK is a significant enzyme in regulating the glycolytic flux of Rana ridibunda red blood cells. The existence of a regulatory mechanism controlled by the energy status of the red cell, as well as the state of oxygenation of haemoglobin, is discussed, in which PFK occupies a central role.

Original languageEnglish (US)
Pages (from-to)479-487
Number of pages9
JournalComparative Biochemistry and Physiology -- Part B: Biochemistry and
Volume107
Issue number3
DOIs
StatePublished - Jan 1 1994

Fingerprint

Rana ridibunda
Phosphofructokinases
Purification
Erythrocytes
Kinetics
Enzymes
Chromatography
Adenosine Triphosphate
Enzyme Activators
2,3-Diphosphoglycerate
Cells
Adenosine Monophosphate
Column chromatography
Oxygenation
Hemoglobins
Molecular Weight
High Pressure Liquid Chromatography
Blood
Chemical activation
Molecular weight

Keywords

  • Effectors
  • Erythrocytes
  • Phosphofructokinase
  • Rana ridibunda

ASJC Scopus subject areas

  • Biochemistry
  • Physiology
  • Molecular Biology

Cite this

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title = "Purification and kinetic properties of phosphofructokinase from Rana ridibunda erythrocytes",
abstract = "Phosphofructokinase (PFK) from Rana ridibunda erythrocytes was purified about 570-fold by column chromatography on Cibacron Blue Sepharose. The resulting enzyme preparation had a specific activity of 1.94 U/mg protein and a pH maximum of 7.6. The molecular weight as determined by HPLC chromatography was 330,000 Da. The S0.5 value for fructose-6-phosphate (F6P) was 5.6 mM and the Km for ATP 0.87 mM. The enzyme was sensitive to inhibition by ATP which was increased with lower F6P concentrations. At physiological levels of 2,3-diphosphoglycerate (0.35 μmol/ml RBC), 20{\%} of PFK activity was inhibited. Significant activations under cellular conditions were exercised by AMP and, to a lesser extent, by P1. Micromolar concentrations of fructose-2,6-bisphosphate and glucose-1,6-bisphosphate were also potent activators of the erythrocyte enzyme. Fructose-1,6-bisphosphate (10-50) μM activated the enzyme to a limited extent. With respect to these effects, it is suggested that PFK is a significant enzyme in regulating the glycolytic flux of Rana ridibunda red blood cells. The existence of a regulatory mechanism controlled by the energy status of the red cell, as well as the state of oxygenation of haemoglobin, is discussed, in which PFK occupies a central role.",
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Purification and kinetic properties of phosphofructokinase from Rana ridibunda erythrocytes. / Kaloyianni, M.; Kotinis, K.; Gounaris, E. G.

In: Comparative Biochemistry and Physiology -- Part B: Biochemistry and, Vol. 107, No. 3, 01.01.1994, p. 479-487.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Purification and kinetic properties of phosphofructokinase from Rana ridibunda erythrocytes

AU - Kaloyianni, M.

AU - Kotinis, K.

AU - Gounaris, E. G.

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N2 - Phosphofructokinase (PFK) from Rana ridibunda erythrocytes was purified about 570-fold by column chromatography on Cibacron Blue Sepharose. The resulting enzyme preparation had a specific activity of 1.94 U/mg protein and a pH maximum of 7.6. The molecular weight as determined by HPLC chromatography was 330,000 Da. The S0.5 value for fructose-6-phosphate (F6P) was 5.6 mM and the Km for ATP 0.87 mM. The enzyme was sensitive to inhibition by ATP which was increased with lower F6P concentrations. At physiological levels of 2,3-diphosphoglycerate (0.35 μmol/ml RBC), 20% of PFK activity was inhibited. Significant activations under cellular conditions were exercised by AMP and, to a lesser extent, by P1. Micromolar concentrations of fructose-2,6-bisphosphate and glucose-1,6-bisphosphate were also potent activators of the erythrocyte enzyme. Fructose-1,6-bisphosphate (10-50) μM activated the enzyme to a limited extent. With respect to these effects, it is suggested that PFK is a significant enzyme in regulating the glycolytic flux of Rana ridibunda red blood cells. The existence of a regulatory mechanism controlled by the energy status of the red cell, as well as the state of oxygenation of haemoglobin, is discussed, in which PFK occupies a central role.

AB - Phosphofructokinase (PFK) from Rana ridibunda erythrocytes was purified about 570-fold by column chromatography on Cibacron Blue Sepharose. The resulting enzyme preparation had a specific activity of 1.94 U/mg protein and a pH maximum of 7.6. The molecular weight as determined by HPLC chromatography was 330,000 Da. The S0.5 value for fructose-6-phosphate (F6P) was 5.6 mM and the Km for ATP 0.87 mM. The enzyme was sensitive to inhibition by ATP which was increased with lower F6P concentrations. At physiological levels of 2,3-diphosphoglycerate (0.35 μmol/ml RBC), 20% of PFK activity was inhibited. Significant activations under cellular conditions were exercised by AMP and, to a lesser extent, by P1. Micromolar concentrations of fructose-2,6-bisphosphate and glucose-1,6-bisphosphate were also potent activators of the erythrocyte enzyme. Fructose-1,6-bisphosphate (10-50) μM activated the enzyme to a limited extent. With respect to these effects, it is suggested that PFK is a significant enzyme in regulating the glycolytic flux of Rana ridibunda red blood cells. The existence of a regulatory mechanism controlled by the energy status of the red cell, as well as the state of oxygenation of haemoglobin, is discussed, in which PFK occupies a central role.

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