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Significance Elevated expression of the iron–sulfur (Fe-S) protein nutrient-deprivation autophagy factor-1 (NAF-1) is associated with the progression of multiple cancer types. Here we demonstrate that the lability of the Fe-S cluster of NAF-1 plays a key role in promoting breast cancer cell proliferation, tumor growth, and resistance of cancer cells to oxidative stress. Our study establishes an important role for the unique 3Cys-1His Fe-S cluster coordination structure of NAF-1 in promoting the development of breast cancer tumors and suggests the potential use of drugs that suppress NAF-1 accumulation or stabilize its cluster in the treatment of cancers that display high expression levels of NAF-1.

Breast cancer tumorigenicity is dependent on high expression levels of NAF-1 and the lability of its Fe-S clusters