Abstract
We report the characterization of three Superoxide dismutase (sod) genes isolated from a bacterium in the Geobacillus genus. We isolated the bacterium from high-temperature pond mud and used 16S rRNA gene sequence to confirm its identity in the Geobacillus genus. The three genes Mn-sod, Fe/Mn-sod, and Cu/Zn-sod were cloned and analyzed. Their open reading frames are Mn-sod: 615 bp encoding a 204 amino acid protein; Fe/Mn-sod: 1,236 bp encoding a 411 amino acid protein; Cu/Zn-sod: 522 bp encoding a 173 amino acid protein. When these sod genes were expressed in Escherichia coli, only Mn-SOD was able to be purified. The activity of the purified Mn-SOD we got was about 2,730 U/mg. Studies of this Mn-SOD showed that it was thermostable at 60°, had 70% activity at 80° after 2.5 h, and still had 30% activity at 90° after 2.5 h. Mn-SOD activity required the ion Mn2+. Based on gel electrophoresis, we deduced that this Mn-SOD was a homotetramer. No activity was detected after the other two genes (Fe/Mn-sod, Cu/Zn-sod) were expressed in Escherichia coli, but activities were detected when expressed in Pichia pastoris.
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Abbreviations
- sod/SOD:
-
Superoxide dismutase
- PCR:
-
Polymerase chain reaction
- RDB:
-
Regeneration dextrose base
- BMGY:
-
Buffered glycerol complex
- BMMY:
-
Buffered methanol complex
- MD:
-
Minimal dextrose
- MM:
-
Minimal methanol
- LB:
-
Luria-Bertani
- PAGE:
-
Polyacrylamide gel electrophoresis
- SDS-PAGE:
-
Sodium dodecyl sulfate–polyacrylamide gel electrophoresis
- MALDI-TOF:
-
Matrix-assisted laser desorption/ionization Time-of-flight mass spectrometry
- Tris:
-
Trihydroxymethyl aminomethane
- PDB code:
-
Protein dada bank code
- NBT:
-
Nitro blue tetrazolium
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Zou, Y., Yang, L., Liu, G. et al. Identification of Three Superoxide dismutase Genes from a Geobacillus sp.. Protein J 30, 66–71 (2011). https://doi.org/10.1007/s10930-010-9303-z
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DOI: https://doi.org/10.1007/s10930-010-9303-z