Serveur d'exploration sur le phanerochaete

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Electrochemical evidence of self-substrate inhibition as functions regulation for cellobiose dehydrogenase from Phanerochaete chrysosporium.

Identifieur interne : 000637 ( Main/Exploration ); précédent : 000636; suivant : 000638

Electrochemical evidence of self-substrate inhibition as functions regulation for cellobiose dehydrogenase from Phanerochaete chrysosporium.

Auteurs : Leonard Stoica [Suède] ; Tautgirdas Ruzgas ; Lo Gorton

Source :

RBID : pubmed:19640808

Descripteurs français

English descriptors

Abstract

The reaction mechanism of cellobiose dehydrogenase (CDH) from Phanerochaete chrysosporium, adsorbed on graphite electrodes, was investigated by following its catalytic reaction with cellobiose registered in both direct and mediated electron transfer modes between the enzyme and the electrode. A wall-jet flow through amperometric cell housing the CDH-modified graphite electrode was connected to a single line flow injection system. In the present study, it is proven that cellobiose, at concentrations higher than 200 microM, competes for the reduced state of the FAD cofactor and it slows down the transfer of electrons to any 2e(-)/H(+) acceptors or further to the heme cofactor, via the internal electron transfer pathway. Based on and proven by electrochemical results, a kinetic model of substrate inhibition is proposed and supported by the agreement between simulation of plots and experimental data. The implications of this kinetic model, called pseudo-ping-pong mechanism, on the possible functions CDH are also discussed. The enzyme exhibits catalytic activity also for lactose, but in contrast to cellobiose, this sugar does not inhibit the enzyme. This suggests that even if some other substrates are coincidentally oxidized by CDH, however, they do not trigger all the possible natural functions of the enzyme. In this respect, cellobiose is regarded as the natural substrate of CDH.

DOI: 10.1016/j.bioelechem.2009.06.007
PubMed: 19640808


Affiliations:


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Le document en format XML

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<nlm:affiliation>Department of Analytical Chemistry, Lund University, P.O. Box 124, SE-221 00, Lund, Sweden. leonard.stoica@rub.de</nlm:affiliation>
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<name sortKey="Ruzgas, Tautgirdas" sort="Ruzgas, Tautgirdas" uniqKey="Ruzgas T" first="Tautgirdas" last="Ruzgas">Tautgirdas Ruzgas</name>
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<term>Binding, Competitive (MeSH)</term>
<term>Carbohydrate Dehydrogenases (antagonists & inhibitors)</term>
<term>Carbohydrate Dehydrogenases (chemistry)</term>
<term>Carbohydrate Dehydrogenases (metabolism)</term>
<term>Cellobiose (chemistry)</term>
<term>Cellobiose (metabolism)</term>
<term>Cellobiose (pharmacology)</term>
<term>Circular Dichroism (MeSH)</term>
<term>Dose-Response Relationship, Drug (MeSH)</term>
<term>Electrochemistry (MeSH)</term>
<term>Electron Transport (MeSH)</term>
<term>Enzyme Inhibitors (chemistry)</term>
<term>Enzyme Inhibitors (metabolism)</term>
<term>Enzyme Inhibitors (pharmacology)</term>
<term>Hydroquinones (chemistry)</term>
<term>Hydroquinones (metabolism)</term>
<term>Kinetics (MeSH)</term>
<term>Lactose (chemistry)</term>
<term>Lactose (metabolism)</term>
<term>Phanerochaete (enzymology)</term>
<term>Protein Conformation (MeSH)</term>
<term>Protein Denaturation (MeSH)</term>
</keywords>
<keywords scheme="KwdFr" xml:lang="fr">
<term>Antienzymes (composition chimique)</term>
<term>Antienzymes (métabolisme)</term>
<term>Antienzymes (pharmacologie)</term>
<term>Carbohydrate dehydrogenases (antagonistes et inhibiteurs)</term>
<term>Carbohydrate dehydrogenases (composition chimique)</term>
<term>Carbohydrate dehydrogenases (métabolisme)</term>
<term>Cellobiose (composition chimique)</term>
<term>Cellobiose (métabolisme)</term>
<term>Cellobiose (pharmacologie)</term>
<term>Cinétique (MeSH)</term>
<term>Conformation des protéines (MeSH)</term>
<term>Dichroïsme circulaire (MeSH)</term>
<term>Dénaturation des protéines (MeSH)</term>
<term>Fixation compétitive (MeSH)</term>
<term>Hydroquinones (composition chimique)</term>
<term>Hydroquinones (métabolisme)</term>
<term>Lactose (composition chimique)</term>
<term>Lactose (métabolisme)</term>
<term>Phanerochaete (enzymologie)</term>
<term>Relation dose-effet des médicaments (MeSH)</term>
<term>Transport d'électrons (MeSH)</term>
<term>Électrochimie (MeSH)</term>
</keywords>
<keywords scheme="MESH" type="chemical" qualifier="antagonists & inhibitors" xml:lang="en">
<term>Carbohydrate Dehydrogenases</term>
</keywords>
<keywords scheme="MESH" type="chemical" qualifier="chemistry" xml:lang="en">
<term>Carbohydrate Dehydrogenases</term>
<term>Cellobiose</term>
<term>Enzyme Inhibitors</term>
<term>Hydroquinones</term>
<term>Lactose</term>
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<keywords scheme="MESH" type="chemical" qualifier="metabolism" xml:lang="en">
<term>Carbohydrate Dehydrogenases</term>
<term>Cellobiose</term>
<term>Enzyme Inhibitors</term>
<term>Hydroquinones</term>
<term>Lactose</term>
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<keywords scheme="MESH" type="chemical" qualifier="pharmacology" xml:lang="en">
<term>Cellobiose</term>
<term>Enzyme Inhibitors</term>
</keywords>
<keywords scheme="MESH" qualifier="antagonistes et inhibiteurs" xml:lang="fr">
<term>Carbohydrate dehydrogenases</term>
</keywords>
<keywords scheme="MESH" qualifier="composition chimique" xml:lang="fr">
<term>Antienzymes</term>
<term>Carbohydrate dehydrogenases</term>
<term>Cellobiose</term>
<term>Hydroquinones</term>
<term>Lactose</term>
</keywords>
<keywords scheme="MESH" qualifier="enzymologie" xml:lang="fr">
<term>Phanerochaete</term>
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<keywords scheme="MESH" qualifier="enzymology" xml:lang="en">
<term>Phanerochaete</term>
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<term>Antienzymes</term>
<term>Carbohydrate dehydrogenases</term>
<term>Cellobiose</term>
<term>Hydroquinones</term>
<term>Lactose</term>
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<keywords scheme="MESH" qualifier="pharmacologie" xml:lang="fr">
<term>Antienzymes</term>
<term>Cellobiose</term>
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<term>Binding, Competitive</term>
<term>Circular Dichroism</term>
<term>Dose-Response Relationship, Drug</term>
<term>Electrochemistry</term>
<term>Electron Transport</term>
<term>Kinetics</term>
<term>Protein Conformation</term>
<term>Protein Denaturation</term>
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<term>Cinétique</term>
<term>Conformation des protéines</term>
<term>Dichroïsme circulaire</term>
<term>Dénaturation des protéines</term>
<term>Fixation compétitive</term>
<term>Relation dose-effet des médicaments</term>
<term>Transport d'électrons</term>
<term>Électrochimie</term>
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<div type="abstract" xml:lang="en">The reaction mechanism of cellobiose dehydrogenase (CDH) from Phanerochaete chrysosporium, adsorbed on graphite electrodes, was investigated by following its catalytic reaction with cellobiose registered in both direct and mediated electron transfer modes between the enzyme and the electrode. A wall-jet flow through amperometric cell housing the CDH-modified graphite electrode was connected to a single line flow injection system. In the present study, it is proven that cellobiose, at concentrations higher than 200 microM, competes for the reduced state of the FAD cofactor and it slows down the transfer of electrons to any 2e(-)/H(+) acceptors or further to the heme cofactor, via the internal electron transfer pathway. Based on and proven by electrochemical results, a kinetic model of substrate inhibition is proposed and supported by the agreement between simulation of plots and experimental data. The implications of this kinetic model, called pseudo-ping-pong mechanism, on the possible functions CDH are also discussed. The enzyme exhibits catalytic activity also for lactose, but in contrast to cellobiose, this sugar does not inhibit the enzyme. This suggests that even if some other substrates are coincidentally oxidized by CDH, however, they do not trigger all the possible natural functions of the enzyme. In this respect, cellobiose is regarded as the natural substrate of CDH.</div>
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<AbstractText>The reaction mechanism of cellobiose dehydrogenase (CDH) from Phanerochaete chrysosporium, adsorbed on graphite electrodes, was investigated by following its catalytic reaction with cellobiose registered in both direct and mediated electron transfer modes between the enzyme and the electrode. A wall-jet flow through amperometric cell housing the CDH-modified graphite electrode was connected to a single line flow injection system. In the present study, it is proven that cellobiose, at concentrations higher than 200 microM, competes for the reduced state of the FAD cofactor and it slows down the transfer of electrons to any 2e(-)/H(+) acceptors or further to the heme cofactor, via the internal electron transfer pathway. Based on and proven by electrochemical results, a kinetic model of substrate inhibition is proposed and supported by the agreement between simulation of plots and experimental data. The implications of this kinetic model, called pseudo-ping-pong mechanism, on the possible functions CDH are also discussed. The enzyme exhibits catalytic activity also for lactose, but in contrast to cellobiose, this sugar does not inhibit the enzyme. This suggests that even if some other substrates are coincidentally oxidized by CDH, however, they do not trigger all the possible natural functions of the enzyme. In this respect, cellobiose is regarded as the natural substrate of CDH.</AbstractText>
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<NameOfSubstance UI="D006873">Hydroquinones</NameOfSubstance>
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<Chemical>
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<MeshHeading>
<DescriptorName UI="D011489" MajorTopicYN="N">Protein Denaturation</DescriptorName>
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