Abstract
The crystal structure of gpD, the capsid-stabilizing protein of bacteriophage λ, was solved at 1.1 Å resolution. Data were obtained from twinned crystals in space group P21 and refined with anisotropic temperature factors to an R-factor of 0.098 (Rfree = 0.132). GpD (109 residues) has a novel fold with an unusually low content of regular secondary structure. Noncrystallographic trimers with substantial intersubunit interfaces were observed. The C-termini are well ordered and located on one side of the trimer, relatively far from its three-fold axis. The N-termini are disordered up to Ser 15, which is close to the three-fold axis and on the same side as the C-termini. A density map of the icosahedral viral capsid at 15 Å resolution, obtained by cryo-electron microscopy and image reconstruction, reveals gpD trimers, seemingly indistinguishable from the ones seen in the crystals, at all three-fold sites. The map further reveals that the side of the trimer that binds to the capsid is the side on which both termini reside. Despite this orientation of the gpD trimer, fusion proteins connected by linker peptides to either terminus bind to the capsid, allowing protein and peptide display.
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Acknowledgements
We thank V. Hawkins for assistance with the capsid preparations, H. Iwai and O. Zerbe for performing the NMR experiments and for stimulating discussions, M. Feiss, R. Weisberg, D. Belnap, and R. Hendrix for helpful suggestions, M. Feiss and R. Hoess for supplying material, and A. Arthur for editorial comments.
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Yang, F., Forrer, P., Dauter, Z. et al. Novel fold and capsid-binding properties of the λ-phage display platform protein gpD. Nat Struct Mol Biol 7, 230–237 (2000). https://doi.org/10.1038/73347
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DOI: https://doi.org/10.1038/73347
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