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The family of polo like kinases (Plks) regulate cell cycle progression through key functional roles in mitosis. While the four mammalian family members, Plk1-4, share overlapping functions, each member possesses unique functions that may be dictated in part by their ability to phosphorylate different substrates. Numerous cellular substrates for Plk1, 2, and 3 have been characterized, but the protein...
New work by Elia et al. in this issue of Cell reveals the molecular basis of phosphopeptide recognition by the polo domain and the domain's dual function to promote substrate recognition by targeting the kinase to subcellular structures and to autoregulate the adjacent protein kinase catalytic domain.
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