摘要(英) |
Heavy metals exist in the natural environment and have strong toxicity, which is easy to cause harm to the human body. When organisms are exposed to heavy metals, metallothioneins combine with heavy metals to reduce the toxicity of heavy metals. The three types of sustained expression of metallothionein (MT) plasmid in Escherichia coli were constructed and compared. In Escherichia coli, only metallothionein was expressed alone, because metallothionein is a small molecule protein not stable, however, metallothionein is attached to green fluorescent protein (EGFP) or glutathione S-transferase (GST), metallothionein can be stably expressed in Escherichia coli. While testing for heavy metal resistance, it was confirmed that Escherichia coli can grow in medium of 150 ppm Ni2+ or Cd2+. Because of the nickel ion efflux system of Escherichia coli, nickel ions cannot be present in Escherichia coli for a long time, and cannot be used for bioremediation of nickel. However, the expression of metallothionein fusion protein in Escherichia coli, after 24 hours, to avoid the massive loss of nickel ions from Escherichia coli, and effectively absorb nickel ions 1.5 mg/g, indicating that metallothionein is effective for increasing the absorption of nickel. |
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