Soil bacterium uses a genetic switch to break down insecticide residues
Zhu Q, Wei K, Lyu Y, Xie Q, Pan K
Soil Health
The carbamate insecticide residues that linger in garden and farm soil get cleaned up by microbes like this one, so knowing how they switch on their cleanup tools points toward healthier soil after pesticide use.
A soil bacterium can break down a common insecticide called isoprocarb. Researchers found the protein that acts like a light switch, turning on the bacterium's cleanup genes only when a toxic leftover chemical shows up. They also mapped the exact spot on the DNA where the switch grips and the parts of the protein that sense the chemical.
Key Findings
The PucR-type regulator IppR is essential for activating the ippA1A2 gene cluster that hydroxylates 2-isopropylphenol (IPP) in Rhodococcus sp. D-6, shown by gene disruption and complementation.
IPP is the effector molecule of IppR; IppR binds a 24-bp promoter motif, and the CC/CG box within it is the critical binding site.
Predicted IPP-binding residues include Val188, Leu192, Val218, Trp257, Trp259, His297 and Ala300, while Lys382 and Thr384 are predicted to be essential for DNA recognition.
chevron_right Technical Summary
Scientists identified the genetic switch that lets a soil bacterium turn on its pesticide-breakdown machinery only when a toxic byproduct of the insecticide isoprocarb is present. Understanding this switch helps explain how soil microbes clean up carbamate insecticide residues.
Abstract Preview
Original paper
The PucR-type activator IppR regulates 2-isopropylphenol hydroxylation in strain Rhodococcus sp. D-6.
Although genes involved in isoprocarb (IPC) degradation, including the IPC hydrolase gene ipcH and the 2-isopropylphenol (IPP) hydroxylation gene cluster ippA1A2, have been identified in Rhodococcu...
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