Mitochondrial ferritin (FTMT)

**Mitochondrial ferritin (FTMT)** is an iron-sequestering, H-ferritin-like protein localized specifically within mitochondria, structurally similar to cytosolic H-ferritin but with unique features that adapt it for mitochondrial biology[1][3][4][5]. It forms 24-subunit shell structures and protects mitochondria by oxidizing and storing iron, preventing harmful iron-induced oxidative stress[5][4]. FTMT's expression is tissue-specific, mainly found in metabolically active tissues such as brain, testis, and heart, and is notably increased in certain pathological conditions characterized by mitochondrial iron overload, including several neurodegenerative diseases and sideroblastic anemia[1][4]. Unlike cytosolic ferritins, FTMT expression does not depend on cellular iron levels, reflecting a different regulatory mechanism[1][4]. Its function includes regulating iron trafficking between the cytosol and mitochondria, with overexpression leading to mitochondrial iron loading and cytosolic iron depletion[1][4]. FTMT has no known direct therapeutics or drug inhibitors/activators and is not a classical drug target such as a receptor or enzyme in drug development[4][5]. It may serve as a biomarker for specific anemias and diseases involving abnormal mitochondrial iron metabolism[1][4].

Other names

Ferritin, mitochondrialMtFmitochondrial ferritinMTFferritin H subunit, mitochondrial ferritinFTMT