National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R01GM097572
米国
引用
ジャーナル: Nat Struct Mol Biol / 年: 2022 タイトル: Structurally derived universal mechanism for the catalytic cycle of the tail-anchored targeting factor Get3. 著者: Michelle Y Fry / Vladimíra Najdrová / Ailiena O Maggiolo / Shyam M Saladi / Pavel Doležal / William M Clemons / 要旨: Tail-anchored (TA) membrane proteins, accounting for roughly 2% of proteomes, are primarily targeted posttranslationally to the endoplasmic reticulum membrane by the guided entry of TA proteins (GET) ...Tail-anchored (TA) membrane proteins, accounting for roughly 2% of proteomes, are primarily targeted posttranslationally to the endoplasmic reticulum membrane by the guided entry of TA proteins (GET) pathway. For this complicated process, it remains unknown how the central targeting factor Get3 uses nucleotide to facilitate large conformational changes to recognize then bind clients while also preventing exposure of hydrophobic surfaces. Here, we identify the GET pathway in Giardia intestinalis and present the structure of the Get3-client complex in the critical postnucleotide-hydrolysis state, demonstrating that Get3 reorganizes the client-binding domain (CBD) to accommodate and shield the client transmembrane helix. Four additional structures of GiGet3, spanning the nucleotide-free (apo) open to closed transition and the ATP-bound state, reveal the details of nucleotide stabilization and occluded CBD. This work resolves key conundrums and allows for a complete model of the dramatic conformational landscape of Get3.
解像度: 3→28.11 Å / Cor.coef. Fo:Fc: 0.831 / Cor.coef. Fo:Fc free: 0.768 / SU B: 26.846 / SU ML: 0.492 / 交差検証法: THROUGHOUT / ESU R Free: 0.659 / 立体化学のターゲット値: MAXIMUM LIKELIHOOD / 詳細: HYDROGENS HAVE BEEN ADDED IN THE RIDING POSITIONS
Rfactor
反射数
%反射
Selection details
Rfree
0.3483
709
4.8 %
RANDOM
Rwork
0.29314
-
-
-
obs
0.2958
14025
91.16 %
-
溶媒の処理
イオンプローブ半径: 0.8 Å / 減衰半径: 0.8 Å / VDWプローブ半径: 1.2 Å / 溶媒モデル: MASK