Iron-dependent enzymes and heme-containing proteins (Hemoproteins and Iron Enzymes)

Iron-dependent enzymes and heme-containing proteins (hemoproteins) constitute a diverse and essential class of biomolecules that utilize iron, either as a standalone cofactor or within a porphyrin ring (heme), to perform critical biological functions (NIH, 2020; Wikipedia, 2024). These functions include oxygen transport and storage by hemoglobin and myoglobin, electron transfer in the mitochondrial respiratory chain by cytochromes, and the catalysis of various redox reactions by enzymes such as cytochrome P450, cyclooxygenase (COX), and nitric oxide synthase (NOS) (Oregon State University, 2024; Frontiers in Physiology, 2023). In disease, dysregulation of these proteins is linked to cancer, chronic inflammation, cardiovascular disorders, and neurodegeneration, often through mechanisms involving oxidative stress or metabolic imbalances (NIH, 2019; MDPI, 2019). Therapeutically, this group contains numerous high-value targets; for instance, COX inhibitors are used for pain and inflammation, while indoleamine 2,3-dioxygenase (IDO) inhibitors are explored in oncology to overcome immune tolerance (RSC, 2024; NIH, 2023). Additionally, drugs like roxadustat target prolyl hydroxylases to treat anemia, and soluble guanylate cyclase (sGC) stimulators like riociguat address pulmonary hypertension (NIH, 2020). However, targeting these proteins requires careful management of safety concerns, such as potential drug-drug interactions mediated by cytochrome P450 enzymes and the risk of oxidative damage from free iron or heme (NIH, 2022; Harvard, 2024).

Other names

HemoproteinsIron-containing proteinsIron-dependent proteinsIron-containing metalloproteins

Enzyme inhibition (e.g., IDO1, COX, RNR), sGC stimulation, iron chelation, and prolyl hydroxylase inhibition.