Regulation of COX Assembly and Function by Twin CX 9 C Proteins-Implications for Human Disease.
Level 5 - mechanism / opinion, no new human data
Narrative review of mechanistic and preclinical laboratory studies
PubMed 33498264 · doi:10.3390/cells10020197
What was done
This narrative review synthesized literature on the twin CX9C protein family, focusing on their Mia40/CHCHD4-mediated import into the mitochondrial intermembrane space, their regulatory interactions in cytochrome c oxidase (COX/Complex IV) assembly and function across model systems ranging from yeast to human cells, and their dual localization to the nucleus.
What was found
The abstract reports no quantitative metrics or effect estimates. It notes qualitatively that knockdown of discussed twin CX9C proteins leads to decreased or absent aerobic respiration across species, and that specific members (including MNRR1 and CHCHD10) undergo dual mitochondrial and nuclear localization to regulate transcription in response to oxygen and cellular stress.
Why it matters
The review delineates how twin CX9C proteins coordinate mitochondrial energy production and retrograde mitochondrial-nuclear signaling, outlining molecular mechanisms potentially relevant to human mitochondrial disorders.
Limits
The paper is a qualitative narrative review without systematic search criteria or original empirical data. Findings rely largely on basic cell and model organism experiments, and no clinical outcome data are reported in the abstract.
Cited by
- supports Cytochrome c oxidase in the mitochondrial electron transport chain is the enzyme complex where electrons and oxygen combine to produce metabolic water.