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Publication Abstract from PubMed

Avian reovirus fibre, a homo-trimer of the sigmaC protein, is a minor component of the avian reovirus outer capsid. It is anchored via a short N-terminal sequence to the inner capsid lambdaC pentamer, and its protruding globular C-terminal domain is responsible for primary host cell attachment. We have previously solved the structure of a receptor-binding fragment in which residues 160-191 form a triple beta-spiral and 196-326 a beta-barrel head domain. Here we have expressed, purified and crystallized a major sigmaC fragment comprising residues 117-326. Its structure, which was solved by molecular replacement using the previously determined receptor-binding domain structure and refined to 1.75 A (0.175 nm) resolution, reveals an alpha-helical triple coiled-coil connected to the previously solved structure by a zinc-ion-containing linker. The coiled-coil domain contains two chloride ion binding sites, as well as specific trimerization and registration sequences. The linker may act as a functionally important hinge.

Crystallographic structure of the alpha-helical triple coiled-coil domain of avian reovirus S1133 fibre.,Guardado-Calvo P, Fox GC, Llamas-Saiz AL, van Raaij MJ J Gen Virol. 2009 Mar;90(Pt 3):672-7. PMID:19218213^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.