Netherlands Organisation for Scientific Research (NWO)
OCENW.KLEIN.026
オランダ
引用
ジャーナル: EMBO J / 年: 2022 タイトル: Teneurin4 dimer structures reveal a calcium-stabilized compact conformation supporting homomeric trans-interactions. 著者: Dimphna H Meijer / Cátia P Frias / J Wouter Beugelink / Yanthi N Deurloo / Bert J C Janssen / 要旨: Establishment of correct synaptic connections is a crucial step during neural circuitry formation. The Teneurin family of neuronal transmembrane proteins promotes cell-cell adhesion via homophilic ...Establishment of correct synaptic connections is a crucial step during neural circuitry formation. The Teneurin family of neuronal transmembrane proteins promotes cell-cell adhesion via homophilic and heterophilic interactions, and is required for synaptic partner matching in the visual and hippocampal systems in vertebrates. It remains unclear how individual Teneurins form macromolecular cis- and trans-synaptic protein complexes. Here, we present a 2.7 Å cryo-EM structure of the dimeric ectodomain of human Teneurin4. The structure reveals a compact conformation of the dimer, stabilized by interactions mediated by the C-rich, YD-shell, and ABD domains. A 1.5 Å crystal structure of the C-rich domain shows three conserved calcium binding sites, and thermal unfolding assays and SAXS-based rigid-body modeling demonstrate that the compactness and stability of Teneurin4 dimers are calcium-dependent. Teneurin4 dimers form a more extended conformation in conditions that lack calcium. Cellular assays reveal that the compact cis-dimer is compatible with homomeric trans-interactions. Together, these findings support a role for teneurins as a scaffold for macromolecular complex assembly and the establishment of cis- and trans-synaptic interactions to construct functional neuronal circuits.
構造決定の手法: 分子置換 開始モデル: From unpublished anomalous experiment 解像度: 1.4→33.19 Å / Cor.coef. Fo:Fc: 0.977 / Cor.coef. Fo:Fc free: 0.976 / SU B: 1.96 / SU ML: 0.032 / 交差検証法: THROUGHOUT / σ(F): 0 / ESU R: 0.054 / ESU R Free: 0.048 / 立体化学のターゲット値: MAXIMUM LIKELIHOOD 詳細: HYDROGENS HAVE BEEN ADDED IN THE RIDING POSITIONS U VALUES : REFINED INDIVIDUALLY
Rfactor
反射数
%反射
Selection details
Rfree
0.1705
927
4.8 %
RANDOM
Rwork
0.1548
-
-
-
obs
0.1556
18241
98.69 %
-
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