Application of immobilized thrombin for production of S-thanatin expressed in Escherichia coli

S-thanatin, a small antimicrobial peptide with 21 amino acid residues, was expressed as a fusion protein containing thrombin cleavage site in Escherichia coli BL21 (DE3). To reduce the production cost, immobilization of thrombin in polyacrylamide gel for cleavage was studied in this work. The immobi...

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Veröffentlicht in:Applied microbiology and biotechnology 2011-10, Vol.92 (1), p.85-93
Hauptverfasser: Wu, Guoqiu, Deng, Xuepeng, Li, Xiaofang, Wang, Xiyong, Wang, Shenglan, Xu, Hanmei
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container_title Applied microbiology and biotechnology
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creator Wu, Guoqiu
Deng, Xuepeng
Li, Xiaofang
Wang, Xiyong
Wang, Shenglan
Xu, Hanmei
description S-thanatin, a small antimicrobial peptide with 21 amino acid residues, was expressed as a fusion protein containing thrombin cleavage site in Escherichia coli BL21 (DE3). To reduce the production cost, immobilization of thrombin in polyacrylamide gel for cleavage was studied in this work. The immobilized thrombin exhibited excellent activity within wider ranges of pH value and temperature for reaction than free enzyme, and the residual activity could remain above 75% after ten times of usage. Tricine–SDS–PAGE result showed that the immobilized thrombin could cleave the S-thanatin fusion protein effectively. After cleavage, recombinant S-thanatin was purified by preparative reversed-phase high-performance liquid chromatography and mass spectrum showed that the molecular weight (2,448.86) was close to the theoretical value (2,448.98). After purification, about 7 mg of S-thanatin was obtained from 1 l of culture and the recombinant exhibited excellent bioactivity to E. coli ATCC 25922, with the minimum inhibitory concentration of 12 μg/ml. The purification method could be applied to prepare other peptides with similar properties at low cost.
doi_str_mv 10.1007/s00253-011-3379-z
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To reduce the production cost, immobilization of thrombin in polyacrylamide gel for cleavage was studied in this work. The immobilized thrombin exhibited excellent activity within wider ranges of pH value and temperature for reaction than free enzyme, and the residual activity could remain above 75% after ten times of usage. Tricine–SDS–PAGE result showed that the immobilized thrombin could cleave the S-thanatin fusion protein effectively. After cleavage, recombinant S-thanatin was purified by preparative reversed-phase high-performance liquid chromatography and mass spectrum showed that the molecular weight (2,448.86) was close to the theoretical value (2,448.98). After purification, about 7 mg of S-thanatin was obtained from 1 l of culture and the recombinant exhibited excellent bioactivity to E. coli ATCC 25922, with the minimum inhibitory concentration of 12 μg/ml. The purification method could be applied to prepare other peptides with similar properties at low cost.</abstract><cop>Berlin/Heidelberg</cop><pub>Springer Berlin Heidelberg</pub><pmid>21655979</pmid><doi>10.1007/s00253-011-3379-z</doi><tpages>9</tpages></addata></record>
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subjects Amino acids
Antibiotics
Antimicrobial agents
Antimicrobial Cationic Peptides - genetics
Antimicrobial Cationic Peptides - isolation & purification
Antimicrobial Cationic Peptides - metabolism
Biological activity
Biological and medical sciences
Biotechnological Products and Process Engineering
Biotechnology
Chromatography
Cloning
E coli
Electrophoresis, Polyacrylamide Gel
Enzyme Stability
Enzymes
Enzymes, Immobilized - chemistry
Enzymes, Immobilized - metabolism
Escherichia coli
Escherichia coli - genetics
Ethylenediaminetetraacetic acid
Fundamental and applied biological sciences. Psychology
Gene Expression
High performance liquid chromatography
Hydrogen-Ion Concentration
Life Sciences
Liquid chromatography
Microbial Genetics and Genomics
Microbial Sensitivity Tests
Microbiology
Molecular Weight
Peptides
Proteins
Recombinant Fusion Proteins - genetics
Recombinant Fusion Proteins - isolation & purification
Recombinant Fusion Proteins - metabolism
Studies
Temperature
Thrombin
Thrombin - chemistry
Thrombin - metabolism
title Application of immobilized thrombin for production of S-thanatin expressed in Escherichia coli
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