2iun

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spinqualitylabelsall models 2iun, resolution 2.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image

STRUCTURE OF THE C-TERMINAL HEAD DOMAIN OF THE AVIAN ADENOVIRUS CELO LONG FIBRE (P21 CRYSTAL FORM)

Overview

Avian adenovirus CELO (chicken embryo lethal orphan virus, fowl adenovirus, type 1) incorporates two different homotrimeric fiber proteins extending, from the same penton base: a long fiber (designated fiber 1) and a short, fiber (designated fiber 2). The short fibers extend straight outwards from, the viral vertices, whilst the long fibers emerge at an angle. In contrast, to the short fiber, which binds an unknown avian receptor and has been, shown to be essential to the invasiveness of this virus, the long fiber, appears to be unnecessary for infection in birds. Both fibers contain a, short N-terminal virus-binding peptide, a slender shaft domain and a, globular C-terminal head domain; the head domain, by analogy with human, adenoviruses, is likely to be involved mainly in receptor binding. This, study reports the high-resolution crystal structure of the head domain of, the long fiber, solved using single isomorphous replacement (using, anomalous signal) and refined against data at 1.6 A (0.16 nm) resolution., The C-terminal globular head domain had an anti-parallel beta-sandwich, fold formed by two four-stranded beta-sheets with the same overall, topology as human adenovirus fiber heads. The presence in the sequence of, characteristic repeats N-terminal to the head domain suggests that the, shaft domain contains a triple beta-spiral structure. Implications of the, structure for the function and stability of the avian adenovirus long, fiber protein are discussed; notably, the structure suggests a different, mode of binding to the coxsackievirus and adenovirus receptor from that, proposed for the human adenovirus fiber heads.

About this Structure

2IUN is a Single protein structure of sequence from Fowl adenovirus 1 with as ligand. Full crystallographic information is available from OCA.

Reference

Structure of the C-terminal head domain of the fowl adenovirus type 1 long fiber., Guardado-Calvo P, Llamas-Saiz AL, Fox GC, Langlois P, van Raaij MJ, J Gen Virol. 2007 Sep;88(Pt 9):2407-16. PMID:17698649

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