Copper-binding proteins specifically incorporate the metal into their structure for catalytic and structural purposes. Noncatalytic, structural sites are found in copper sensing proteins involved in the regulation of copper metabolism and in copper sequestering peptides and proteins involved in protection against copper intoxication. The sensing proteins regulate all aspects of copper metabolism, including the uptake, intracellular use, detoxification, and export of copper. Commonly, the regulation is affected at the transcriptional level, and the binding of copper by the protein is the switch that modulates the sensor protein’s structure and function. The binding in these sites takes place through cysteinyl thiolates.
Noncatalytic Roles of Copper in Proteins
In noncatalytic proteins, copper serves a structural-regulatory role, a role mediated by its specific binding to sensory proteins where a change is elicited in the...
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