Lipid scrambling is a general feature of protein insertases

D Li, C Rocha-Roa, MA Schilling… - Proceedings of the …, 2024 - National Acad Sciences
Glycerophospholipids are synthesized primarily in the cytosolic leaflet of the endoplasmic
reticulum (ER) membrane and must be equilibrated between bilayer leaflets to allow the ER …

Insertases scramble lipids: molecular simulations of MTCH2

L Bartoš, AK Menon, R Vácha - Structure, 2024 - cell.com
Scramblases play a pivotal role in facilitating bidirectional lipid transport across cell
membranes, thereby influencing lipid metabolism, membrane homeostasis, and cellular …

Lipid somersaults: Uncovering the mechanisms of protein-mediated lipid flipping

TG Pomorski, AK Menon - Progress in lipid research, 2016 - Elsevier
Membrane lipids diffuse rapidly in the plane of the membrane but their ability to flip
spontaneously across a membrane bilayer is hampered by a significant energy barrier. Thus …

TMEM41B acts as an ER scramblase required for lipoprotein biogenesis and lipid homeostasis

D Huang, B Xu, LU Liu, L Wu, Y Zhu, A Ghanbarpour… - Cell metabolism, 2021 - cell.com
How amphipathic phospholipids are shuttled between the membrane bilayer remains an
essential but elusive process, particularly at the endoplasmic reticulum (ER). One prominent …

On the molecular mechanism of flippase-and scramblase-mediated phospholipid transport

C Montigny, J Lyons, P Champeil, P Nissen… - Biochimica et Biophysica …, 2016 - Elsevier
Phospholipid flippases are key regulators of transbilayer lipid asymmetry in eukaryotic cell
membranes, critical to many trafficking and signaling pathways. P4-ATPases, in particular …

The ER membrane protein complex is a transmembrane domain insertase

A Guna, N Volkmar, JC Christianson, RS Hegde - Science, 2018 - science.org
Insertion of proteins into membranes is an essential cellular process. The extensive
biophysical and topological diversity of membrane proteins necessitates multiple insertion …

Structural basis for membrane insertion by the human ER membrane protein complex

T Pleiner, GP Tomaleri, K Januszyk, AJ Inglis, M Hazu… - Science, 2020 - science.org
A defining step in the biogenesis of a membrane protein is the insertion of its hydrophobic
transmembrane helices into the lipid bilayer. The nine-subunit endoplasmic reticulum (ER) …

Out-of-the-groove transport of lipids by TMEM16 and GPCR scramblases

M Malvezzi, KK Andra, K Pandey… - Proceedings of the …, 2018 - National Acad Sciences
Phospholipid scramblases externalize phosphatidylserine to facilitate numerous
physiological processes. Several members of the structurally unrelated TMEM16 and G …

Membrane insertases at a glance

B Kizmaz, JM Herrmann - Journal of Cell Science, 2023 - journals.biologists.com
Protein translocases, such as the bacterial SecY complex, the Sec61 complex of the
endoplasmic reticulum (ER) and the mitochondrial translocases, facilitate the transport of …

Atg9 is a lipid scramblase that mediates autophagosomal membrane expansion

K Matoba, T Kotani, A Tsutsumi, T Tsuji, T Mori… - Nature structural & …, 2020 - nature.com
The molecular function of Atg9, the sole transmembrane protein in the autophagosome-
forming machinery, remains unknown. Atg9 colocalizes with Atg2 at the expanding edge of …