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タイトル | A Janus-Faced IM30 Ring Involved in Thylakoid Membrane Fusion Is Assembled from IM30 Tetramers. |
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ジャーナル・号・ページ | Structure, Vol. 25, Issue 9, Page 1380-11390.e5, Year 2017 |
掲載日 | 2017年9月5日 |
著者 | Michael Saur / Raoul Hennig / Phoebe Young / Kristiane Rusitzka / Nadja Hellmann / Jennifer Heidrich / Nina Morgner / Jürgen Markl / Dirk Schneider / |
PubMed 要旨 | Biogenesis and dynamics of thylakoid membranes likely involves membrane fusion events. Membrane attachment of the inner membrane-associated protein of 30 kDa (IM30) affects the structure of the ...Biogenesis and dynamics of thylakoid membranes likely involves membrane fusion events. Membrane attachment of the inner membrane-associated protein of 30 kDa (IM30) affects the structure of the lipid bilayer, finally resulting in membrane fusion. Yet, how IM30 triggers membrane fusion is largely unclear. IM30 monomers pre-assemble into stable tetrameric building blocks, which further align to form oligomeric ring structures, and differently sized IM30 rings bind to membranes. Based on a 3D reconstruction of IM30 rings, we locate the IM30 loop 2 region at the bottom of the ring and show intact membrane binding but missing fusogenic activity of loop 2 mutants. However, helix 7, which has recently been shown to mediate membrane binding, was located at the oppossite, top side of IM30 rings. We propose that a two-sided IM30 ring complex connects two opposing membranes, finally resulting in membrane fusion. Thus, IM30-mediated membrane fusion requires a Janus-faced IM30 ring. |
リンク | Structure / PubMed:28803692 |
手法 | EM (単粒子) |
解像度 | 25.0 Å |
構造データ | EMDB-3717: EMDB-3737: EMDB-3738: EMDB-3739: EMDB-3740: |
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