ジャーナル: Nat Commun / 年: 2023 タイトル: Structural basis for membrane attack complex inhibition by CD59. 著者: Emma C Couves / Scott Gardner / Tomas B Voisin / Jasmine K Bickel / Phillip J Stansfeld / Edward W Tate / Doryen Bubeck / 要旨: CD59 is an abundant immuno-regulatory receptor that protects human cells from damage during complement activation. Here we show how the receptor binds complement proteins C8 and C9 at the membrane to ...CD59 is an abundant immuno-regulatory receptor that protects human cells from damage during complement activation. Here we show how the receptor binds complement proteins C8 and C9 at the membrane to prevent insertion and polymerization of membrane attack complex (MAC) pores. We present cryo-electron microscopy structures of two inhibited MAC precursors known as C5b8 and C5b9. We discover that in both complexes, CD59 binds the pore-forming β-hairpins of C8 to form an intermolecular β-sheet that prevents membrane perforation. While bound to C8, CD59 deflects the cascading C9 β-hairpins, rerouting their trajectory into the membrane. Preventing insertion of C9 restricts structural transitions of subsequent monomers and indirectly halts MAC polymerization. We combine our structural data with cellular assays and molecular dynamics simulations to explain how the membrane environment impacts the dual roles of CD59 in controlling pore formation of MAC, and as a target of bacterial virulence factors which hijack CD59 to lyse human cells.
タイプ: MAXIMUM LIKELIHOOD / ソフトウェア - 名称: cryoSPARC (ver. 3.3.2)
最終 角度割当
タイプ: MAXIMUM LIKELIHOOD / ソフトウェア - 名称: cryoSPARC (ver. 3.3.2)
最終 3次元分類
クラス数: 4 / 平均メンバー数/クラス: 51965 / ソフトウェア - 名称: RELION (ver. 3.1) 詳細: 3D Classification was used to remove junk particles and particles with graphene oxide edges.
FSC曲線 (解像度の算出)
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原子モデル構築 1
詳細
Initial rigid body fits were performed using UCSF Chimera and UCSF ChimeraX. Carbohydrates were added using Coot. Models were refined iteratively using Isolde and Phenix Real Space Refine.