membrane protein targeting / ATPase / chaperone / protein complex
機能・相同性
機能・相同性情報
cell morphogenesis involved in conjugation with cellular fusion / GET complex / TRC complex / pheromone-dependent signal transduction involved in conjugation with cellular fusion / tail-anchored membrane protein insertion into ER membrane / 加水分解酵素; 酸無水物に作用 / protein insertion into ER membrane / post-translational protein targeting to endoplasmic reticulum membrane / response to arsenic-containing substance / retrograde vesicle-mediated transport, Golgi to endoplasmic reticulum ...cell morphogenesis involved in conjugation with cellular fusion / GET complex / TRC complex / pheromone-dependent signal transduction involved in conjugation with cellular fusion / tail-anchored membrane protein insertion into ER membrane / 加水分解酵素; 酸無水物に作用 / protein insertion into ER membrane / post-translational protein targeting to endoplasmic reticulum membrane / response to arsenic-containing substance / retrograde vesicle-mediated transport, Golgi to endoplasmic reticulum / response to metal ion / vesicle-mediated transport / protein folding chaperone / guanyl-nucleotide exchange factor activity / cytoplasmic stress granule / unfolded protein binding / response to heat / cellular response to oxidative stress / protein-macromolecule adaptor activity / endoplasmic reticulum membrane / endoplasmic reticulum / Golgi apparatus / ATP hydrolysis activity / ATP binding / metal ion binding / identical protein binding / nucleus / cytosol / cytoplasm 類似検索 - 分子機能
Mdy2, Get4 binding domain / Get5, C-terminal domain / Binding domain to Get4 on Get5, Golgi to ER traffic protein / Ubiquitin-like protein MDY2, C-terminal domain / Golgi to ER traffic protein 4 / Golgi to ER traffic protein 4 / : / Arsenical pump ATPase, ArsA/GET3, eukaryotic / Arsenical pump ATPase, ArsA/GET3 / Anion-transporting ATPase-like domain ...Mdy2, Get4 binding domain / Get5, C-terminal domain / Binding domain to Get4 on Get5, Golgi to ER traffic protein / Ubiquitin-like protein MDY2, C-terminal domain / Golgi to ER traffic protein 4 / Golgi to ER traffic protein 4 / : / Arsenical pump ATPase, ArsA/GET3, eukaryotic / Arsenical pump ATPase, ArsA/GET3 / Anion-transporting ATPase-like domain / Anion-transporting ATPase / Ubiquitin family / Ubiquitin homologues / Tetratricopeptide-like helical domain superfamily / Ubiquitin domain profile. / Ubiquitin-like domain / Ubiquitin-like domain superfamily / P-loop containing nucleoside triphosphate hydrolase 類似検索 - ドメイン・相同性
Golgi to ER traffic protein 4 / ATPase GET3 / Ubiquitin-like protein MDY2 類似検索 - 構成要素
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
米国
引用
ジャーナル: J Biol Chem / 年: 2025 タイトル: Get4/5-mediated remodeling of Get3's substrate-binding chamber: Insights into tail-anchored protein targeting by the GET pathway. 著者: Diego Granados-Villanueva / Andrew Rossow / Kelly H Kim / 要旨: The Guided Entry of Tail-Anchored Proteins (GET) pathway ensures accurate targeting of Tail-Anchored proteins (TAs)-a diverse class of membrane proteins-to the endoplasmic reticulum (ER) membrane. In ...The Guided Entry of Tail-Anchored Proteins (GET) pathway ensures accurate targeting of Tail-Anchored proteins (TAs)-a diverse class of membrane proteins-to the endoplasmic reticulum (ER) membrane. In yeast, newly synthesized TAs are captured by Sgt2 and transferred to Get3 for delivery to the ER, where they undergo subsequent membrane insertion. Efficient and protected handoff of hydrophobic TAs from Sgt2 to Get3 is facilitated by the Get4/5 complex, which is thought to act as a scaffold to position TA-bound Sgt2 and Get3 in proximity while trapping Get3 in an ATP-bound conformation necessary for TA binding. To define the molecular basis for this process, we determined the cryo-EM structure of the Saccharomyces cerevisiae Get3-Get4/5 complex at 3.2 Å resolution. Our structure shows that Get4/5 remodels Get3's TA-binding chamber by unfolding helices that form the lateral walls of the chamber. We termed this region the "lateral gate," as its helix-to-coil transition makes the TA-binding chamber more solvent accessible. Molecular dynamics simulations highlighted the flexibility of the lateral gate, indicating it is structurally dynamic and prone to conformational changes. Mutagenesis studies showed that the lateral gate residues influence both the binding affinity of Get3 for Get4/5 and its ATPase activity. Additionally, our cryo-EM map shows that the Sgt2-binding domain of Get5 is positioned near the lateral gate opening of Get3's TA-binding chamber. Based on these findings, we propose a model in which Get4/5 opens Get3's TA-binding chamber to form a lateral opening, enabling protected, lateral transfer of TAs from Sgt2 to Get3.