Heme-dependent peroxidase and catalase

Heme-based peroxidases and catalases are a diverse group of enzymes that utilize a heme prosthetic group to facilitate the reduction of hydrogen peroxide and other organic hydroperoxides [1]. These enzymes, which include myeloperoxidase (MPO), thyroid peroxidase (TPO), and catalase (CAT), play critical roles in maintaining redox homeostasis by neutralizing reactive oxygen species (ROS) and are involved in specialized physiological processes such as the innate immune response and thyroid hormone biosynthesis [2, 3]. For instance, MPO generates hypochlorous acid to kill pathogens, while TPO is essential for iodinating thyroglobulin [3, 4]. Dysregulation of these enzymes is linked to various pathologies, including chronic inflammation, cardiovascular diseases, and neurodegeneration [3]. Consequently, they serve as significant therapeutic targets; drugs like methimazole target TPO for hyperthyroidism, and novel MPO inhibitors like verdiperstat are being investigated for neurodegenerative and inflammatory conditions [4, 5]. Understanding the structural nuances of the heme-binding site is crucial for developing selective inhibitors that do not interfere with other essential heme proteins like hemoglobin or cytochromes [1]. Sources: [1] UniProt (Heme peroxidase), [2] PubChem (Catalase), [3] StatPearls (Myeloperoxidase), [4] PubMed (Thyroid peroxidase), [5] ClinicalTrials.gov (Verdiperstat).

Other names

Heme peroxidasesHydroperoxidasesHeme-containing oxidoreductasesCatalase-peroxidase family

Inhibition of the heme-mediated catalytic cycle to prevent the formation of reactive oxygen species or to modulate specific biosynthetic pathways like thyroid hormone production.