Serveur d'exploration sur la glutarédoxine

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N-terminus deletion affecting the preparation of soluble cyanobacterial glutaredoxin in Escherichia coli.

Identifieur interne : 000C73 ( Main/Exploration ); précédent : 000C72; suivant : 000C74

N-terminus deletion affecting the preparation of soluble cyanobacterial glutaredoxin in Escherichia coli.

Auteurs : Min Li [République populaire de Chine] ; Qing Yang ; Yang Gao ; Qingyu Wu

Source :

RBID : pubmed:17447885

Descripteurs français

English descriptors

Abstract

Glutaredoxin has been implicated in maintenance of a normal cellular thiol/disufide ratio and the regeneration of oxidatively damaged proteins. In order to obtain more information about these important regulatory proteins in cyanobacteria, we have previously cloned and expressed the first cyanobacterial glutaredoxin gene ssr2061 in Escherichia coli. In this work, the second glutaredoxin gene slr1562 was studied. About 90% of Grx2061 coded by ssr2061 was produced in a soluble form while 90% of Grx1562 coded by slr1562 was found in inclusion bodies. To improve the production of soluble Grx1562, we constructed two mutants: Grx1562NC with cysteines in conserved site substituted by serines, and Grx1562M with N-terminus hydrophobic region deletion. Only the latter mutant was successfully expressed in soluble form with increased glutaredoxin activity and showed less sensitivity in oxidative stress. Spectroscopic analysis shows that the structure of Grx1562M with less hydrophobic nature could give more opportunity for protein solubility and could improve the substrate catalytic efficiency. These results suggest that hydrophobic N-terminus determines the insolubility of Grx1562 and may provide another strategy for increasing expression level of soluble heterologous proteins in E. coli.

DOI: 10.1134/s0006297907030091
PubMed: 17447885


Affiliations:


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Le document en format XML

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<term>Amino Acid Sequence (MeSH)</term>
<term>Bacterial Proteins (chemistry)</term>
<term>Bacterial Proteins (genetics)</term>
<term>Bacterial Proteins (metabolism)</term>
<term>Catalysis (MeSH)</term>
<term>Circular Dichroism (MeSH)</term>
<term>Cyanobacteria (genetics)</term>
<term>Cyanobacteria (metabolism)</term>
<term>Electrophoresis, Polyacrylamide Gel (MeSH)</term>
<term>Escherichia coli (genetics)</term>
<term>Glutaredoxins (MeSH)</term>
<term>Hydrophobic and Hydrophilic Interactions (MeSH)</term>
<term>Molecular Sequence Data (MeSH)</term>
<term>Mutation (MeSH)</term>
<term>Oxidative Stress (MeSH)</term>
<term>Oxidoreductases (chemistry)</term>
<term>Oxidoreductases (genetics)</term>
<term>Oxidoreductases (metabolism)</term>
<term>Recombinant Proteins (chemistry)</term>
<term>Recombinant Proteins (isolation & purification)</term>
<term>Recombinant Proteins (metabolism)</term>
<term>Sequence Deletion (MeSH)</term>
<term>Sequence Homology, Amino Acid (MeSH)</term>
<term>Solubility (MeSH)</term>
<term>Spectrometry, Fluorescence (MeSH)</term>
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<term>Cyanobactéries (métabolisme)</term>
<term>Dichroïsme circulaire (MeSH)</term>
<term>Données de séquences moléculaires (MeSH)</term>
<term>Délétion de séquence (MeSH)</term>
<term>Escherichia coli (génétique)</term>
<term>Glutarédoxines (MeSH)</term>
<term>Interactions hydrophobes et hydrophiles (MeSH)</term>
<term>Mutation (MeSH)</term>
<term>Oxidoreductases (composition chimique)</term>
<term>Oxidoreductases (génétique)</term>
<term>Oxidoreductases (métabolisme)</term>
<term>Protéines bactériennes (composition chimique)</term>
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<term>Protéines recombinantes (isolement et purification)</term>
<term>Protéines recombinantes (métabolisme)</term>
<term>Similitude de séquences d'acides aminés (MeSH)</term>
<term>Solubilité (MeSH)</term>
<term>Spectrométrie de fluorescence (MeSH)</term>
<term>Stress oxydatif (MeSH)</term>
<term>Séquence d'acides aminés (MeSH)</term>
<term>Électrophorèse sur gel de polyacrylamide (MeSH)</term>
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<term>Recombinant Proteins</term>
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<term>Recombinant Proteins</term>
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<term>Protéines recombinantes</term>
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<term>Escherichia coli</term>
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<term>Cyanobactéries</term>
<term>Escherichia coli</term>
<term>Oxidoreductases</term>
<term>Protéines bactériennes</term>
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<term>Oxidoreductases</term>
<term>Protéines bactériennes</term>
<term>Protéines recombinantes</term>
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<term>Amino Acid Sequence</term>
<term>Catalysis</term>
<term>Circular Dichroism</term>
<term>Electrophoresis, Polyacrylamide Gel</term>
<term>Glutaredoxins</term>
<term>Hydrophobic and Hydrophilic Interactions</term>
<term>Molecular Sequence Data</term>
<term>Mutation</term>
<term>Oxidative Stress</term>
<term>Sequence Deletion</term>
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<term>Solubility</term>
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<term>Délétion de séquence</term>
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<term>Mutation</term>
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<div type="abstract" xml:lang="en">Glutaredoxin has been implicated in maintenance of a normal cellular thiol/disufide ratio and the regeneration of oxidatively damaged proteins. In order to obtain more information about these important regulatory proteins in cyanobacteria, we have previously cloned and expressed the first cyanobacterial glutaredoxin gene ssr2061 in Escherichia coli. In this work, the second glutaredoxin gene slr1562 was studied. About 90% of Grx2061 coded by ssr2061 was produced in a soluble form while 90% of Grx1562 coded by slr1562 was found in inclusion bodies. To improve the production of soluble Grx1562, we constructed two mutants: Grx1562NC with cysteines in conserved site substituted by serines, and Grx1562M with N-terminus hydrophobic region deletion. Only the latter mutant was successfully expressed in soluble form with increased glutaredoxin activity and showed less sensitivity in oxidative stress. Spectroscopic analysis shows that the structure of Grx1562M with less hydrophobic nature could give more opportunity for protein solubility and could improve the substrate catalytic efficiency. These results suggest that hydrophobic N-terminus determines the insolubility of Grx1562 and may provide another strategy for increasing expression level of soluble heterologous proteins in E. coli.</div>
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