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Front. Plant Sci. | doi: 10.3389/fpls.2019.01500

Functional implications of multiple IM30 oligomeric states

  • 1Johannes Gutenberg University Mainz, Germany

The inner membrane-associated protein of 30 kDa (IM30), also known as the vesicle-inducing protein in plastids 1 (Vipp1), is essential for photo-autotrophic growth of cyanobacteria, algae and higher plants. While its exact function still remains largely elusive, it is commonly accepted that IM30 is crucially involved in thylakoid membrane biogenesis, stabilization and/or maintenance. A characteristic feature of IM30 is its intrinsic propensity to form large homo-oligomeric protein complexes. 15 years ago, it has been reported that these supercomplexes have a ring-shaped structure. However, the in vivo significance of these ring structures is not finally resolved yet and the formation of more complex assemblies has been reported. We here present and discuss research on IM30 conducted within the past 25 years with a special emphasis on the question of why we potentially need IM30 supercomplexes in vivo.

Keywords: IM30, VIPP1, PspA, thylakoid membrane, Membrane Fusion, membrane stabilization, membrane dynamics, Heat shock proteins

Received: 21 Aug 2019; Accepted: 29 Oct 2019.

Copyright: © 2019 Siebenaller, Junglas and Schneider. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Prof. Dirk Schneider, Johannes Gutenberg University Mainz, Mainz, 55099, Rhineland-Palatinate, Germany, dirk.schneider@uni-mainz.de