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Purification and characterization of a hyperthermostable Mn-superoxide dismutase from Thermus thermophilus HB27

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Abstract

Thermostable Mn-dependent catalases are promising enzymes in biotechnological applications. In the present study, a Mn-containing superoxide dismutase of the hyperthermophilic Thermus thermophilus HB27 had been purified and characterized by a two-stage ultrafiltration process after being expressed in E. coli. The enzyme was highly stable at 90°C and retained 57% activity after heat treatment at 100°C for 1 h. The native form of the enzyme was determined as a homotetramer by analytical size exclusion chromatography and sodium dodecyl sulfate–polyacrylamide gel electrophoresis. The final purified enzyme had an isoelectric point of 6.2 and a high α-helical content of 70%, consistent with the theoretical values. This showed that the purified SOD folded with a reasonable secondary structure.

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Abbreviations

Mn-SOD:

Manganese superoxide dismutase

CD:

Circular dichroism

IEF:

Isoelectric focusing

SDS–PAGE:

Sodium dodecyl sulfate–polyacrylamide gel electrophoresis

IgG:

Immunoglobulin G

BSA:

Bovine serum albumin

PES:

Polyethersulfone

MWCO:

Molecular weight cut-off

RC:

Regenerated cellulose

PCR:

Polymerase chain reaction

pI :

Isoelectric point

E. coli :

Escherichia coli

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Acknowledgments

The authors are grateful for the financial support of the Doctoral Foundation of Shandong Province (No. 2008BS02018).

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Correspondence to Hu Zhu.

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Communicated by A. Driessen.

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Liu, J., Yin, M., Zhu, H. et al. Purification and characterization of a hyperthermostable Mn-superoxide dismutase from Thermus thermophilus HB27. Extremophiles 15, 221–226 (2011). https://doi.org/10.1007/s00792-010-0350-3

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  • DOI: https://doi.org/10.1007/s00792-010-0350-3

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