2BT8

Structure of the C-terminal receptor-binding domain of avian reovirus fibre sigmaC, space group P6322.

2BT8 の概要

• エントリーDOI: 10.2210/pdb2bt8/pdb
• 関連するPDBエントリー: 2BSF 2BT7
• 分子名称: SIGMA C (2 entities in total)
• 機能のキーワード: orthoreovirus, triple beta-spiral, beta-barrel, viral protein
• 由来する生物種: AVIAN ORTHOREOVIRUS
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 18324.34

構造登録者

Guardado Calvo, P.,Fox, G.C.,Hermo Parrado, X.L.,Llamas-Saiz, A.L.,van Raaij, M.J. (登録日: 2005-05-26, 公開日: 2005-11-03, 最終更新日: 2024-05-08)

主引用文献

Guardado Calvo, P.,Fox, G.C.,Hermo Parrado, X.L.,Llamas-Saiz, A.L.,Costas, C.,Martinez-Costas, J.,Benavente, J.,van Raaij, M.J.
Structure of the Carboxy-Terminal Receptor-Binding Domain of Avian Reovirus Fibre Sigmac
J.Mol.Biol., 354:137-, 2005

PubMed Abstract: 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.

PubMed: 16236316
DOI: 10.1016/J.JMB.2005.09.034

実験手法

X-RAY DIFFRACTION (3 Å)