Friday, Jul 24, 2026 The claims desk. Receipts included. POWERED BY LENZ ↗
IsThis

SCIENCE

The Claim

The mitochondrial calcium uniporter complex mediates rapid Ca²⁺ uptake into mitochondria driven by the large negative inner mitochondrial membrane potential.

Verified by Lenz ·

The Short Version

The evidence strongly supports this description of mitochondrial calcium transport. Across reviews, structural studies, and foundational papers, the MCU complex is identified as the canonical pathway for rapid Ca2+ uptake into the mitochondrial matrix, powered by the large negative inner mitochondrial membrane potential. Caveats about regulation and debated alternative pathways do not change that core conclusion.

Caveats

  • The wording should not be read as implying MCU is the only proposed rapid Ca2+ uptake pathway under all experimental conditions.
  • The rate of MCU-mediated uptake depends on regulatory subunits, local Ca2+ microdomains, and cell type or physiological state.
  • One listed item is not an independent citable source; the conclusion rests on the peer-reviewed literature, not background-model knowledge.

The Receipts

  1. Molecular mechanism of mitochondrial calcium uptake

    PMC

  2. The Mitochondrial Calcium Uniporter (MCU): Molecular Identity and Physiological Roles

    PubMed Central

  3. The Mitochondrial Ca2+ Uniporter: Structure, Function and Regulation

    PubMed Central

  4. Structural basis of Ca2+ uptake by mitochondrial calcium uniporter holo-complex

    PubMed

  5. MICU1 encodes a mitochondrial EF hand protein required for Ca2+ uptake

    Nature

  6. Structure and function of the Mitochondrial Calcium Uniporter complex

    PMC

  7. Calcium transport across the inner mitochondrial membrane

    PubMed Central

  8. Molecular identification of the mitochondrial calcium uniporter

    Nature

  9. The molecular era of the mitochondrial calcium uniporter

    Nature Reviews Molecular Cell Biology (PDF via Harvard Medical School)

  10. MCU encodes the pore of the mitochondrial calcium uniporter

    Nature

+ 6 more sources — see the full list on Lenz

Filed Under

Mitochondrial Calcium Uniporter Complex

More Fact Checks