IκB-α, the NF-κB Inhibitory Subunit, Interacts with ANT, the Mitochondrial ATP/ADP Translocator
Year: 2001
Type: article
Abstract: The transcription factor NF-kappaB regulates a wide set of genes involved in the establishment of many cellular processes that control cell activation, proliferation, and apoptosis. IkappaB inhibitory subunits integrate NF-kappaB activation signals through phosphorylation and ubiquitination of its N-terminal domain. Using the two-hybrid system in yeast, we searched for IkappaB-alpha N-terminal domain interactors and therefore potential NF-kappaB regulators. An interaction of IkappaB-alpha with the mitochondrial ATP/ADP translocator ANT was detected in yeast and confirmed in glutathione S-transferase pull-down assays and co-precipitation experiments in transfected cells. Subcellular cell fractionation, resistance to proteinase K treatment, and electron microscopy experiments demonstrated the presence of IkappaB-alpha and associated p65 NF-kappaB in the mitochondrial intermembrane space. IkappaB-alpha.NF-kappaB appeared to be released from mitochondria upon the induction of apoptosis by engagement of the Fas receptor. These data suggest that the mitochondrial IkappaB-alpha.NF-kappaB pool participates in the regulation of apoptosis.
Source: Journal of Biological Chemistry
Authors: Virginie Bottero, Franca Rossi, Michel Samson, Mireille Mari, Paul Hofman, Jean-François Peyron
Institutions: Inserm, Hôpital Pasteur
Language: English
Topic: NF-κB Signaling Pathways
Subfield: Cancer Research
Domain: Life Sciences
Open Access status: hybrid
Estimated APC paid: $3,430
OpenAlex ID: W2035282802