Download MendeleyStructural Basis for the Dual Recognition of Helical Cytokines IL-34 and CSF-1 by CSF-1R.
Ma, X., Lin, W.Y., Chen, Y., Stawicki, S., Mukhyala, K., Wu, Y., Martin, F., Bazan, J.F., Starovasnik, M.A.(2012) Structure 20: 676-687
- PubMed: 22483114
- DOI: https://doi.org/10.1016/j.str.2012.02.010
- Primary Citation of Related Structures:
4DKC, 4DKD, 4DKE, 4DKF - PubMed Abstract:
Lacking any discernible sequence similarity, interleukin-34 (IL-34) and colony stimulating factor 1 (CSF-1) signal through a common receptor CSF-1R on cells of mononuclear phagocyte lineage. Here, the crystal structure of dimeric IL-34 reveals a helical cytokine fold homologous to CSF-1, and we further show that the complex architecture of IL-34 bound to the N-terminal immunoglobulin domains of CSF-1R is similar to the CSF-1/CSF-1R assembly. However, unique conformational adaptations in the receptor domain geometry and intermolecular interface explain the cross-reactivity of CSF-1R for two such distantly related ligands. The docking adaptations of the IL-34 and CSF-1 quaternary complexes, when compared to the stem cell factor assembly, draw a common evolutionary theme for transmembrane signaling. In addition, the structure of IL-34 engaged by a Fab fragment reveals the mechanism of a neutralizing antibody that can help deconvolute IL-34 from CSF-1 biology, with implications for therapeutic intervention in diseases with myeloid pathogenic mechanisms.
Organizational Affiliation:
Department of Structural Biology, Genentech, Inc., 1 DNA Way, South San Francisco, CA 94080, USA.
