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TitleAlternative splicing controls teneurin-latrophilin interaction and synapse specificity by a shape-shifting mechanism.
Journal, issue, pagesNat Commun, Vol. 11, Issue 1, Page 2140, Year 2020
Publish dateMay 1, 2020
AuthorsJingxian Li / Yuan Xie / Shaleeka Cornelius / Xian Jiang / Richard Sando / Szymon P Kordon / Man Pan / Katherine Leon / Thomas C Südhof / Minglei Zhao / Demet Araç /
PubMed AbstractThe trans-synaptic interaction of the cell-adhesion molecules teneurins (TENs) with latrophilins (LPHNs/ADGRLs) promotes excitatory synapse formation when LPHNs simultaneously interact with FLRTs. ...The trans-synaptic interaction of the cell-adhesion molecules teneurins (TENs) with latrophilins (LPHNs/ADGRLs) promotes excitatory synapse formation when LPHNs simultaneously interact with FLRTs. Insertion of a short alternatively-spliced region within TENs abolishes the TEN-LPHN interaction and switches TEN function to specify inhibitory synapses. How alternative-splicing regulates TEN-LPHN interaction remains unclear. Here, we report the 2.9 Å resolution cryo-EM structure of the TEN2-LPHN3 complex, and describe the trimeric TEN2-LPHN3-FLRT3 complex. The structure reveals that the N-terminal lectin domain of LPHN3 binds to the TEN2 barrel at a site far away from the alternatively spliced region. Alternative-splicing regulates the TEN2-LPHN3 interaction by hindering access to the LPHN-binding surface rather than altering it. Strikingly, mutagenesis of the LPHN-binding surface of TEN2 abolishes the LPHN3 interaction and impairs excitatory but not inhibitory synapse formation. These results suggest that a multi-level coincident binding mechanism mediated by a cryptic adhesion complex between TENs and LPHNs regulates synapse specificity.
External linksNat Commun / PubMed:32358586 / PubMed Central
MethodsEM (single particle)
Resolution2.97 Å
Structure data

21205

6vhh

EMDB-21205, PDB-6vhh:
Human Teneurin-2 and human Latrophilin-3 binary complex
Method: EM (single particle) / Resolution: 2.97 Å

Chemicals

ChemComp-NAG:
2-acetamido-2-deoxy-beta-D-glucopyranose

Source
  • homo sapiens (human)
KeywordsMEMBRANE PROTEIN / Adhesion GPCR / synapse / Teneurin / Lphn

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