Structure of the Carboxy-Terminal Receptor-Binding Domain of Avian Reovirus Fibre SigmacGuardado Calvo, P., Fox, G.C., Hermo Parrado, X.L., Llamas-Saiz, A.L., Costas, C., Martinez-Costas, J., Benavente, J., van Raaij, M.J.
(2005) J.Mol.Biol. 354: 137
- PubMed: 16236316
- DOI: 10.1016/j.jmb.2005.09.034
- Primary Citation of Related Structures:
- Also Cited By: 2VRS, 2JJL
- PubMed Abstract:
- Protein Architecture of Avian Reovirus S1133 and Identification of the Cell Attachment Protein
Martinez-Costas, J.,Grande, A.,Varela, R.,Garcia-Martinez, C.,Benavente, J.
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Bodelon, G.,Labrada, L.,Martinez-Costas, J.,Benavente, J.
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- Subunit Composition and Conformational Stability of the Oligomeric Form of the Avian Reovirus Cell-Attachment Protein Sigmac
Grande, A.,Costas, C.,Benavente, J.
(2002) J.Gen.Virol. 83: 131
- Crystal Structure of Reovirus Attachment Protein Sigma1 Reveals Evolutionary Relationship to Adenovirus Fiber
Chappell, J.D.,Prota, A.E.,Dermody, T.S.,Stehle, T.
(2002) Embo J. 21: 1
- Oligomerization and Cell-Binding Properties of the Avian Reovirus Cell-Attachment Protein Sigmac
Grande, A.,Rodriguez, E.,Costas, C.,Everitt, E.,Benavente, J.
(2000) Virology 274: 367
Avian reovirus fibre, a homo-trimer of the sigmaC protein, is responsible for primary host cell attachment. The protein expressed in bacteria forms elongated fibres comprised of a carboxy-terminal globular head domain and a slender shaft, and partial ...
Avian reovirus fibre, a homo-trimer of the sigmaC protein, is responsible for primary host cell attachment. The protein expressed in bacteria forms elongated fibres comprised of a carboxy-terminal globular head domain and a slender shaft, and partial proteolysis yielded a carboxy-terminal protease-stable domain that was amenable to crystallisation. Here, we show that this fragment retains receptor-binding capability and report its structure, solved using two-wavelength anomalous diffraction and refined using data collected from three different crystal forms at 2.1 angstroms, 2.35 angstroms and 3.0 angstroms resolution. The carboxy-terminal globular domain has a beta-barrel fold with the same overall topology as the mammalian reovirus fibre (sigma1). However, the monomers of the sigmaC trimer show a more splayed-out arrangement than in the sigma1 structure. Also resolved are two triple beta-spiral repeats of the shaft or stalk domain. The presence in the sequence of heptad repeats amino-terminal to these triple beta-spiral repeats suggests that the unresolved portion of the shaft domain contains a triple alpha-helical coiled-coil structure. Implications for the function and stability of the sigmaC protein are discussed.
Departamento de Bioquímica y Biología Molecular, Facultad de Farmacia, Universidad de Santiago de Compostela, Campus Sur, E-15782 Santiago de Compostela, Spain.