GM130 is a parallel tetramer with a flexible rod-like structure and N-terminally open (Y-shaped) and closed (I-shaped) conformations

The FEBS Journal
Ryuichi IshidaNobuhiro Nakamura

Abstract

GM130 is a cytoplasmic peripheral membrane protein localized on the cis side of the Golgi apparatus. GM130 is proposed to function as a membrane skeleton, maintaining the structure of the Golgi apparatus, and as a vesicle tether that facilitates vesicle fusion to the Golgi membrane. More than 60% of the GM130 molecule is believed to exist as coiled-coil structures with a probability above 90%, based on its primary amino acid sequence. The predicted coiled-coil region was similar to that of yeast Uso1p and its mammalian homolog, p115, both of which form coiled-coil homodimers. Therefore, GM130 has long been thought to form a homodimer with a rod-like shape. However, our biochemical and electron microscopical analyses revealed that GM130 is a parallel homotetramer with a flexible rod-like structure with I- and Y-shaped conformations. The structure of the N-terminal region may interchange between an open conformation (branched or Y-shaped) and a closed conformation (non-branched or I-shaped), possibly with the help of interacting molecules. This conformational change may alter the oligomeric state of the GM130 molecules and the function of GM130 in the vesicle tethering and the maintenance of the Golgi structure.

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Citations

Jan 23, 2016·Frontiers in Cell and Developmental Biology·Tomasz M Witkos, Martin Lowe
Mar 15, 2016·Trends in Cell Biology·Alison K Gillingham, Sean Munro
Mar 26, 2016·Frontiers in Cell and Developmental Biology·Pak-Yan P Cheung, Suzanne R Pfeffer
Mar 31, 2016·Biophysical Journal·Hengameh ShamsMohammad R K Mofrad
Aug 6, 2016·BioEssays : News and Reviews in Molecular, Cellular and Developmental Biology·Linda Truebestein, Thomas A Leonard
May 1, 2018·Yeast·Bhawik Kumar JainDibyendu Bhattacharyya
Dec 24, 2017·Biochemical Society Transactions·Alison K Gillingham
Sep 22, 2019·Nature Communications·Chih-Chia ChangKuo-Chiang Hsia
Dec 14, 2019·FEBS Letters·Aleksander A RebaneAndreas M Ernst

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