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-Structure paper
| タイトル | Structural basis of lipid transfer by a bridge-like lipid-transfer protein. |
|---|---|
| ジャーナル・号・ページ | Nature, Vol. 642, Issue 8066, Page 242-249, Year 2025 |
| 掲載日 | 2025年4月23日 |
著者 | Yunsik Kang / Katherine S Lehmann / Hannah Long / Amanda Jefferson / Maria Purice / Marc Freeman / Sarah Clark / ![]() |
| PubMed 要旨 | Bridge-like lipid-transport proteins (BLTPs) are an evolutionarily conserved family of proteins that localize to membrane-contact sites and are thought to mediate the bulk transfer of lipids from a ...Bridge-like lipid-transport proteins (BLTPs) are an evolutionarily conserved family of proteins that localize to membrane-contact sites and are thought to mediate the bulk transfer of lipids from a donor membrane, typically the endoplasmic reticulum, to an acceptor membrane, such as that of the cell or an organelle. Although BLTPs are fundamentally important for a wide array of cellular functions, their architecture, composition and lipid-transfer mechanisms remain poorly characterized. Here we present the subunit composition and the cryogenic electron microscopy structure of the native LPD-3 BLTP complex isolated from transgenic Caenorhabditis elegans. LPD-3 folds into an elongated, rod-shaped tunnel of which the interior is filled with ordered lipid molecules that are coordinated by a track of ionizable residues that line one side of the tunnel. LPD-3 forms a complex with two previously uncharacterized proteins, one of which we have named Spigot and the other of which remains unnamed. Spigot interacts with the N-terminal end of LPD-3 where lipids are expected to enter the tunnel, and experiments in multiple model systems indicate that Spigot has a conserved role in BLTP function. Our LPD-3 complex structural data reveal protein-lipid interactions that suggest a model for how the native LPD-3 complex mediates bulk lipid transport and provides a foundation for mechanistic studies of BLTPs. |
リンク | Nature / PubMed:40269155 |
| 手法 | EM (単粒子) |
| 解像度 | 2.7 - 6.2 Å |
| 構造データ | ![]() EMDB-45276: Map of full-length LPD-3 complex EMDB-45399, PDB-9cap: |
| 化合物 | ![]() ChemComp-PEE: ![]() ChemComp-R16: |
| 由来 |
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キーワード | LIPID TRANSPORT / Native / membrane protein complex / BLTP |
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