Structural Basis for Teneurin Function in Circuit-Wiring: A Toxin Motif at the Synapse.
Structural Basis for Teneurin Function in Circuit-Wiring: A Toxin Motif at the Synapse.
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DOI:
10.1016/j.cell.2018.03.036
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发表时间:
2018-04-19
期刊:
影响因子:
64.5
通讯作者:
Araç D
中科院分区:
文献类型:
--
作者:
Li J;Shalev-Benami M;Sando R;Jiang X;Kibrom A;Wang J;Leon K;Katanski C;Nazarko O;Lu YC;Südhof TC;Skiniotis G;Araç D
Teneurins (TENs) are cell-surface adhesion proteins with critical roles in tissue development and axon guidance. Here we report the 3.1-Å electron cryo-microscopy structure of the human TEN2 extracellular region (ECR), revealing a striking similarity to bacterial Tc-toxins. The ECR includes a large β-barrel that partially encapsulates a C-terminal domain, which emerges to the solvent through an opening in the mid-barrel region. An immunoglobulin (Ig)-like domain seals the bottom of the barrel while a β-propeller is attached in a perpendicular orientation. We further show that an alternatively spliced region within the β-propeller acts as a switch to regulate trans-cellular adhesion of TEN2 to latrophilin (LPHN), a transmembrane receptor known to mediate critical functions in the central nervous system. One splice variant activates trans-cellular signaling in a LPHN-dependent manner, whereas the other induces inhibitory postsynaptic differentiation. These results highlight the unusual structural organization of TENs giving rise to their multifarious functions. An adehsion protein with an unexpected, toxin-like fold shows how alternative splicing can regulate synaptic connections
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