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COMMD proteins and the control of the NF kappa B pathway.

Cell Cycle 2007 March 16
The COMM domain containing (COMMD) family of proteins represents a recently discovered set of evolutionarily conserved factors characterized by the presence of a defining carboxy-terminal motif. In vertebrates, there are ten members of the family, and among their emerging functions the control of the transcription factor NFkappaB has been most extensively studied. NFkappaB plays a critical role in a number of homeostatic processes in multicellular organisms, including the regulation of immunity and cell survival. COMMD proteins inhibit NFkappaB mediated gene expression, and recent mechanistic studies have revealed that COMMD1 controls the ubiquitination of NFkappaB subunits, an event linked to transcriptional termination. COMMD1 binds to a multimeric ubiquitin ligase containing Elongins B/C, Cul2 and SOCS1 (ECS( SOCS1)). In this complex, COMMD1 facilitates the binding of NFkappaB subunits to the ligase, thereby promoting their ubiquitination and degradation. Additional insights gained from these studies indicate that COMMD proteins likely play a broader role in cellular homeostasis through their participation in the ubiquitination pathway.

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