- PDB-5gaq: Cryo-EM structure of the Lysenin Pore -
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基本情報
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データベース: PDB / ID: 5gaq
タイトル
Cryo-EM structure of the Lysenin Pore
要素
Lysenin
キーワード
TOXIN / Pore forming protein / aerolysin
機能・相同性
機能・相同性情報
other organism cell membrane / monoatomic ion transport / toxin activity / killing of cells of another organism / defense response to bacterium / extracellular region / membrane 類似検索 - 分子機能
ジャーナル: Nat Commun / 年: 2016 タイトル: Cryo-EM structure of lysenin pore elucidates membrane insertion by an aerolysin family protein. 著者: Monika Bokori-Brown / Thomas G Martin / Claire E Naylor / Ajit K Basak / Richard W Titball / Christos G Savva / 要旨: Lysenin from the coelomic fluid of the earthworm Eisenia fetida belongs to the aerolysin family of small β-pore-forming toxins (β-PFTs), some members of which are pathogenic to humans and animals. ...Lysenin from the coelomic fluid of the earthworm Eisenia fetida belongs to the aerolysin family of small β-pore-forming toxins (β-PFTs), some members of which are pathogenic to humans and animals. Despite efforts, a high-resolution structure of a channel for this family of proteins has been elusive and therefore the mechanism of activation and membrane insertion remains unclear. Here we determine the pore structure of lysenin by single particle cryo-EM, to 3.1 Å resolution. The nonameric assembly reveals a long β-barrel channel spanning the length of the complex that, unexpectedly, includes the two pre-insertion strands flanking the hypothetical membrane-insertion loop. Examination of other members of the aerolysin family reveals high structural preservation in this region, indicating that the membrane-insertion pathway in this family is conserved. For some toxins, proteolytic activation and pro-peptide removal will facilitate unfolding of the pre-insertion strands, allowing them to form the β-barrel of the channel.