Multiple metal-dependent enzymes and signaling proteins

Multiple metal-dependent enzymes and signaling proteins refers to a broad and diverse class of proteins that require metal ions—such as zinc, iron, copper, magnesium, or manganese—as essential cofactors for their structural stability, catalytic activity, or signaling functions. This category encompasses approximately 30-40% of the human proteome, including critical enzymes like matrix metalloproteinases (MMPs), histone deacetylases (HDACs), and carbonic anhydrases, as well as signaling proteins like certain kinases and phosphatases. Metal ions in these proteins can serve structural roles, act as catalytic centers, or participate in redox reactions. Therapeutic strategies targeting this group typically involve chelating agents that sequester metals or small molecules that bind to the metal-coordinated active sites. Drugs like clioquinol and ciclopirox utilize this multi-target mechanism to disrupt essential microbial processes or cancer cell metabolism by inactivating enzymes involved in cellular respiration and DNA synthesis. While this approach is valuable for treating conditions like metal overload, fungal infections, and neurodegeneration, the ubiquitous nature of these proteins poses challenges for achieving high selectivity. The non-specific inhibition of these targets can lead to systemic mineral imbalances and significant safety concerns, such as neurotoxicity.

Other names

MetalloenzymesMetalloproteinsMetal-binding proteinsMetal-dependent proteins

Chelation of essential polyvalent metal cations (e.g., Fe2+, Fe3+, Zn2+, Cu2+) which inactivates multiple metal-dependent enzymes and disrupts metal-mediated signaling pathways.