National Institutes of Health/National Institute on Drug Abuse (NIH/NIDA)
DA018343
米国
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)
5R01AI152421
米国
引用
ジャーナル: Proc Natl Acad Sci U S A / 年: 2022 タイトル: In situ architecture of the lipid transport protein VPS13C at ER-lysosome membrane contacts. 著者: Shujun Cai / Yumei Wu / Andrés Guillén-Samander / William Hancock-Cerutti / Jun Liu / Pietro De Camilli / 要旨: VPS13 is a eukaryotic lipid transport protein localized at membrane contact sites. Previous studies suggested that it may transfer lipids between adjacent bilayers by a bridge-like mechanism. Direct ...VPS13 is a eukaryotic lipid transport protein localized at membrane contact sites. Previous studies suggested that it may transfer lipids between adjacent bilayers by a bridge-like mechanism. Direct evidence for this hypothesis from a full-length structure and from electron microscopy (EM) studies in situ is still missing, however. Here, we have capitalized on AlphaFold predictions to complement the structural information already available about VPS13 and to generate a full-length model of human VPS13C, the Parkinson's disease-linked VPS13 paralog localized at contacts between the endoplasmic reticulum (ER) and endo/lysosomes. Such a model predicts an ∼30-nm rod with a hydrophobic groove that extends throughout its length. We further investigated whether such a structure can be observed in situ at ER-endo/lysosome contacts. To this aim, we combined genetic approaches with cryo-focused ion beam (cryo-FIB) milling and cryo-electron tomography (cryo-ET) to examine HeLa cells overexpressing this protein (either full length or with an internal truncation) along with VAP, its anchoring binding partner at the ER. Using these methods, we identified rod-like densities that span the space separating the two adjacent membranes and that match the predicted structures of either full-length VPS13C or its shorter truncated mutant, thus providing in situ evidence for a bridge model of VPS13 in lipid transport.
EMPIAR-10962 (タイトル: In situ architecture of the lipid transport protein VPS13C at ER-lysosomes membrane contacts Data size: 29.5 Data #1: Tilt series and tomograms used in a cryo-ET study of in situ VPS13C [tilt series])
全体 : full-length human VPS13C bridging the two adjacent membranes
全体
名称: full-length human VPS13C bridging the two adjacent membranes
要素
細胞: full-length human VPS13C bridging the two adjacent membranes
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超分子 #1: full-length human VPS13C bridging the two adjacent membranes
超分子
名称: full-length human VPS13C bridging the two adjacent membranes タイプ: cell / ID: 1 / 親要素: 0 詳細: Subtomogram-average density maps showing a full-length VPS13C rod bridging the two adjacent membranes. C100 symmetry was applied to enhance signal to noise ratio.
由来(天然)
生物種: Homo sapiens (ヒト)
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実験情報
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構造解析
手法
クライオ電子顕微鏡法
解析
サブトモグラム平均法
試料の集合状態
cell
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試料調製
緩衝液
pH: 7.4
凍結
凍結剤: ETHANE-PROPANE
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電子顕微鏡法
顕微鏡
FEI TITAN KRIOS
撮影
フィルム・検出器のモデル: GATAN K3 (6k x 4k) / 平均電子線量: 2.0 e/Å2