Sulfur-containing enzymes and proteins

Sulfur-containing enzymes and proteins represent a broad and diverse class of biological molecules that utilize sulfur, primarily in the form of the amino acids cysteine and methionine or inorganic sulfur clusters, to perform essential life functions. This category includes enzymes involved in the transsulfuration pathway, such as cystathionine beta-synthase, as well as iron-sulfur (Fe-S) cluster proteins critical for mitochondrial electron transport and DNA repair. Sulfur is central to cellular redox homeostasis through the glutathione system and plays a structural role via disulfide bond formation, which is vital for the stability of secreted proteins and receptors. In pharmacology, these proteins are often targeted to modulate oxidative stress, treat metabolic disorders like homocystinuria, or inhibit specific viral and bacterial proteases that rely on thiol chemistry. Because this term describes a functional and chemical grouping rather than a single molecular entity, it encompasses a wide array of therapeutic targets across multiple disease areas.

Other names

Sulfur-metabolizing enzymesThiol-dependent enzymesIron-sulfur cluster proteinsCysteine-containing proteinsSulfur-dependent proteins

Modulation of thiol-disulfide exchange, inhibition of cysteine-dependent catalytic sites, supplementation of sulfur-containing precursors, or disruption of iron-sulfur cluster biogenesis.