A simple approach to detect active-site-directed enzyme-enzyme interactions. The aldolase/glycerol-phosphate-dehydrogenase enzyme system

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Abstract

A novel approach has been elaborated to identify the mechanism of intermediate transfer in interacting enzyme systems. The aldolase/glycerol-3-phosphate-dehydrogenase system was investigated since complex formation between these two enzymes had been demonstrated. The kinetics of dihydroxyacetone phosphate conversion catalyzed by the dehydrogenase in the absence and presence of aldolase was analyzed. It was found that the second-order rate constant (k(cat)/K(m)) of the enzymatic reaction decreases due to the formation of a heterologous complex. The decrease could be attributed to an increase of the K(m) value since k(cat) did not change in the presence of aldolase. In contrast, an apparent increase in the second-order rate constant of dihydroxyacetone phosphate conversion by the dehydrogenase was observed if the triose phosphate was produced by aldolase from fructose 1,6-bisphosphate (consecutive reaction). Moreover, no effect of dihydroxyacetone phosphate on the dissociation constant of the heterologous enzyme complex could be detected by physico-chemical methods. The results suggest that the endogenous dihydroxyacetone phosphate produced by aldolase complexed with dehydrogenase is more accessible for the dehydrogenase than the exogenous one, the binding of which is impeded due to steric hindrance by bound aldolase.

Original languageEnglish
Pages (from-to)655-659
Number of pages5
JournalEuropean Journal of Biochemistry
Volume164
Issue number3
Publication statusPublished - 1987

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glycerol dehydrogenase
Fructose-Bisphosphate Aldolase
Dihydroxyacetone Phosphate
Glycerol
Catalytic Domain
Oxidoreductases
Phosphates
Enzymes
Rate constants
Trioses
Glycerolphosphate Dehydrogenase

ASJC Scopus subject areas

  • Biochemistry

Cite this

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title = "A simple approach to detect active-site-directed enzyme-enzyme interactions. The aldolase/glycerol-phosphate-dehydrogenase enzyme system",
abstract = "A novel approach has been elaborated to identify the mechanism of intermediate transfer in interacting enzyme systems. The aldolase/glycerol-3-phosphate-dehydrogenase system was investigated since complex formation between these two enzymes had been demonstrated. The kinetics of dihydroxyacetone phosphate conversion catalyzed by the dehydrogenase in the absence and presence of aldolase was analyzed. It was found that the second-order rate constant (k(cat)/K(m)) of the enzymatic reaction decreases due to the formation of a heterologous complex. The decrease could be attributed to an increase of the K(m) value since k(cat) did not change in the presence of aldolase. In contrast, an apparent increase in the second-order rate constant of dihydroxyacetone phosphate conversion by the dehydrogenase was observed if the triose phosphate was produced by aldolase from fructose 1,6-bisphosphate (consecutive reaction). Moreover, no effect of dihydroxyacetone phosphate on the dissociation constant of the heterologous enzyme complex could be detected by physico-chemical methods. The results suggest that the endogenous dihydroxyacetone phosphate produced by aldolase complexed with dehydrogenase is more accessible for the dehydrogenase than the exogenous one, the binding of which is impeded due to steric hindrance by bound aldolase.",
author = "B. V{\'e}rtessy and J. Ov{\'a}di",
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T1 - A simple approach to detect active-site-directed enzyme-enzyme interactions. The aldolase/glycerol-phosphate-dehydrogenase enzyme system

AU - Vértessy, B.

AU - Ovádi, J.

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N2 - A novel approach has been elaborated to identify the mechanism of intermediate transfer in interacting enzyme systems. The aldolase/glycerol-3-phosphate-dehydrogenase system was investigated since complex formation between these two enzymes had been demonstrated. The kinetics of dihydroxyacetone phosphate conversion catalyzed by the dehydrogenase in the absence and presence of aldolase was analyzed. It was found that the second-order rate constant (k(cat)/K(m)) of the enzymatic reaction decreases due to the formation of a heterologous complex. The decrease could be attributed to an increase of the K(m) value since k(cat) did not change in the presence of aldolase. In contrast, an apparent increase in the second-order rate constant of dihydroxyacetone phosphate conversion by the dehydrogenase was observed if the triose phosphate was produced by aldolase from fructose 1,6-bisphosphate (consecutive reaction). Moreover, no effect of dihydroxyacetone phosphate on the dissociation constant of the heterologous enzyme complex could be detected by physico-chemical methods. The results suggest that the endogenous dihydroxyacetone phosphate produced by aldolase complexed with dehydrogenase is more accessible for the dehydrogenase than the exogenous one, the binding of which is impeded due to steric hindrance by bound aldolase.

AB - A novel approach has been elaborated to identify the mechanism of intermediate transfer in interacting enzyme systems. The aldolase/glycerol-3-phosphate-dehydrogenase system was investigated since complex formation between these two enzymes had been demonstrated. The kinetics of dihydroxyacetone phosphate conversion catalyzed by the dehydrogenase in the absence and presence of aldolase was analyzed. It was found that the second-order rate constant (k(cat)/K(m)) of the enzymatic reaction decreases due to the formation of a heterologous complex. The decrease could be attributed to an increase of the K(m) value since k(cat) did not change in the presence of aldolase. In contrast, an apparent increase in the second-order rate constant of dihydroxyacetone phosphate conversion by the dehydrogenase was observed if the triose phosphate was produced by aldolase from fructose 1,6-bisphosphate (consecutive reaction). Moreover, no effect of dihydroxyacetone phosphate on the dissociation constant of the heterologous enzyme complex could be detected by physico-chemical methods. The results suggest that the endogenous dihydroxyacetone phosphate produced by aldolase complexed with dehydrogenase is more accessible for the dehydrogenase than the exogenous one, the binding of which is impeded due to steric hindrance by bound aldolase.

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