Abstract
In a recent issue of Nature Communications Ukleja and co‐workers reported a cryo‐EM 3D reconstruction of the Ccr4‐Not complex from Schizosaccharomyces pombe with an immunolocalization of the different subunits. The newly gained architectural knowledge provides cues to apprehend the functional diversity of this major eukaryotic regulator. Indeed, in the cytoplasm alone, Ccr4‐Not regulates translational repression, decapping and deadenylation, and the Not module additionally plays a positive role in translation. The spatial distribution of the subunits within the structure is compatible with a model proposing that the Ccr4‐Not complex interacts with the 5′ and 3′ ends of target mRNAs, allowing different functional modules of the complex to act at different stages of the translation process, possibly within a circular constellation of the mRNA. This work opens new avenues, and reveals important gaps in our understanding regarding structure and mode of function of the Ccr4‐Not complex that need to be addressed in the future.
Highlights
Recently in pressIn a recent issue of Nature Communications Ukleja and coworkers reported a cryo-electron microscopy (EM) 3D reconstruction of the Ccr4Not complex from Schizosaccharomyces pombe with an immunolocalization of the different subunits
Ccr4-Not is a conserved multi-subunit, multifunctional eukaryotic regulator
In the cytoplasm alone, Ccr4-Not regulates translational repression, decapping and deadenylation, and the Not module plays a positive role in translation
Summary
In a recent issue of Nature Communications Ukleja and coworkers reported a cryo-EM 3D reconstruction of the Ccr4Not complex from Schizosaccharomyces pombe with an immunolocalization of the different subunits. In the cytoplasm alone, Ccr4-Not regulates translational repression, decapping and deadenylation, and the Not module plays a positive role in translation. The spatial distribution of the subunits within the structure is compatible with a model proposing that the Ccr4-Not complex interacts with the 50 and 30 ends of target mRNAs, allowing different functional modules of the complex to act at different stages of the translation process, possibly within a circular constellation of the mRNA. This work opens new avenues, and reveals important gaps in our understanding regarding structure and mode of function of the Ccr4-Not complex that need to.
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