Leucine zipper and EF-hand containing transmembrane protein 1 (LETM1)

Leucine zipper and EF-hand containing transmembrane protein 1 (LETM1) is a mitochondrial inner membrane protein that functions primarily as a Ca²⁺/H⁺ antiporter and possibly as a K⁺/H⁺ exchanger. It is important for mitochondrial calcium efflux, potassium homeostasis, tubular mitochondrial morphology, cristae structure, and overall cellular viability. LETM1 is evolutionarily conserved in eukaryotes and essential for embryonic development in model organisms. *LETM1* gene deletion or mutation causes Wolf-Hirschhorn syndrome, characterized by developmental delay, seizures, and craniofacial abnormalities. The exact mechanisms of transport and regulation remain under study, but LETM1's hexameric structure and its role in proton gradient–dependent calcium movement are key features identified to date.

Other names

LETM1SLC55A1Leucine zipper-EF-hand containing transmembrane protein 1Electroneutral mitochondrial K(+)/H(+) exchanger 1Mdm38 homolog (yeast)

Potential drugs would modulate mitochondrial ion transport by altering Ca²⁺/H⁺ or K⁺/H⁺ exchange—affecting mitochondrial homeostasis, calcium signaling, apoptosis, or cell metabolism.