Divalent metal-dependent enzymes and metalloproteins

Divalent metal-dependent enzymes and metalloproteins are a broad class of proteins that utilize divalent metal cations, such as zinc (Zn2+), magnesium (Mg2+), calcium (Ca2+), or manganese (Mn2+), as essential cofactors for their structural integrity or catalytic mechanisms (Source: Andreini et al., 2008, J. Proteome Res.). These proteins are ubiquitous in biology, participating in critical functions such as DNA replication, protein synthesis, and cellular signaling (Source: Holm et al., 1996, Chem. Rev.). For example, matrix metalloproteinases (MMPs) rely on zinc for the degradation of extracellular matrix components, while many kinases require magnesium to facilitate phosphoryl transfer reactions (Source: Chen et al., 2021, Nature Reviews Drug Discovery). Dysregulation of these proteins is linked to numerous pathologies, including cancer metastasis, chronic inflammation, and neurodegenerative diseases like Alzheimer's (Source: Maret, 2013, Metallomics). Therapeutic strategies often involve the use of small-molecule inhibitors that contain metal-binding groups, such as hydroxamates or carboxylates, which coordinate directly with the metal ion in the active site to block substrate binding (Source: Jacobsen et al., 2016, J. Med. Chem.). However, the high degree of conservation among metal-binding motifs across different protein families poses a significant challenge for achieving drug selectivity and minimizing off-target toxicity (Source: Farina and Nabavi, 2015, Life Sci.). Metalloproteins also include transport and storage proteins, such as hemoglobin or calbindin, which are vital for maintaining metal homeostasis within the body (Source: Waldron et al., 2009, Nature).

Other names

MetalloenzymesMetalloproteinsMetal-dependent enzymesDivalent cation-binding proteins

Drugs typically target these proteins through metal coordination (chelation) at the active site, competitive inhibition of substrate binding, or allosteric modulation of the metal-binding environment (Source: Chen et al., 2021, Nature Reviews Drug Discovery).