Metalloproteins and enzymes

Metalloproteins and enzymes constitute a broad and diverse class of proteins that require metal ion cofactors, such as zinc, iron, copper, or magnesium, to perform their biological functions [1]. These metal ions can serve structural roles, stabilizing the protein's three-dimensional architecture, or catalytic roles, where they participate directly in chemical reactions as Lewis acids or redox centers [2]. This category includes approximately 30% to 50% of all known proteins, encompassing vital molecules like hemoglobin for oxygen transport, cytochromes for cellular respiration, and various proteases [3]. In clinical medicine, specific metalloenzymes are major therapeutic targets; for example, Angiotensin-Converting Enzyme (ACE) inhibitors are used for hypertension, and Carbonic Anhydrase inhibitors are used for glaucoma [4]. Drugs targeting these proteins often work by coordinating with the metal ion in the active site, effectively blocking the enzyme's ability to process its substrate [4]. However, because this term describes a functional class rather than a specific molecular entity, it is generally considered too broad to be defined as a single therapeutic target in drug discovery contexts [2]. Safety concerns often involve the potential for off-target effects due to the high conservation of metal-binding motifs across different protein families [4]. Research continues to focus on increasing the selectivity of small-molecule inhibitors to minimize toxicity associated with broad metal chelation [2].

Other names

MetalloenzymesMetal-binding proteinsMetalloproteinsMetallo-enzymesMetallo-enzyme

Inhibition of enzymatic activity through coordination with metal cofactors, competitive inhibition of the active site, or disruption of metal-dependent structural integrity [4].