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TitleA Janus-Faced IM30 Ring Involved in Thylakoid Membrane Fusion Is Assembled from IM30 Tetramers.
Journal, issue, pagesStructure, Vol. 25, Issue 9, Page 1380-11390.e5, Year 2017
Publish dateSep 5, 2017
AuthorsMichael Saur / Raoul Hennig / Phoebe Young / Kristiane Rusitzka / Nadja Hellmann / Jennifer Heidrich / Nina Morgner / Jürgen Markl / Dirk Schneider /
PubMed AbstractBiogenesis 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.
External linksStructure / PubMed:28803692
MethodsEM (single particle)
Resolution25.0 Å
Structure data

EMDB-3717:
Structure of differently sized plant protein
Method: EM (single particle) / Resolution: 25.0 Å

EMDB-3737:
Structure of IM30 in C10-symmetrical assembly
Method: EM (single particle) / Resolution: 25.0 Å

EMDB-3738:
Structure of IM30 in C12-symmetrical assembly
Method: EM (single particle) / Resolution: 25.0 Å

EMDB-3739:
Structure of IM30 in C13-symmetrical assembly
Method: EM (single particle) / Resolution: 25.0 Å

EMDB-3740:
Structure of IM30 in C14-symmetrical assembly
Method: EM (single particle) / Resolution: 25.0 Å

Source
  • Synechocystis sp. PCC 6803 (bacteria)

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