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Copper‐sensitive operon repressors (CsoRs) act to sense cuprous ions and bind them with a high affinity under copper stress in many bacteria. The binding of copper(I) leads to a conformational change in their homotetramer structure, causing disassembly of the operator DNA–CsoR complex and evoking a transcriptional response. Atomic‐level structural insight into the conformational switching mechanism...
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