Abstract
THE 14-3-3 family of proteins have recently been identified as regulatory elements in intracellular signalling pathways1: 14-3-3 proteins bind to oncogene and proto-oncogene products, including c-Raf-1 (refs 2-5), c-Bcr (ref. 6) and polyomavirus middle-T antigen7; overexpression of 14-3-3 activates Raf kinase in yeast2,3 and induces meiotic maturation in Xenopus oocytes5. Here we report the crystal structure of the major isoform of mammalian 14-3-3 proteins at 2.9 Å resolution. Each subunit of the dimeric protein consists of a bundle of nine antiparallel helices that form a palisade around an amphipathic groove. The groove is large enough to accommodate a tenth helix, and we propose that binding to an amphipathic helix represents a general mechanism for the interaction of 14-3-3 with diverse cellular proteins. The residues in the dimer interface and the putative ligand-binding surface are invariant among vertebrates, yeast and plants, suggesting a conservation of structure and function throughout the 14-3-3 family.
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Liu, D., Bienkowska, J., Petosa, C. et al. Crystal structure of the zeta isoform of the 14-3-3 protein. Nature 376, 191–194 (1995). https://doi.org/10.1038/376191a0
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DOI: https://doi.org/10.1038/376191a0
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