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-Structure paper
タイトル | A two-site flexible clamp mechanism for RET-GDNF-GFRα1 assembly reveals both conformational adaptation and strict geometric spacing. |
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ジャーナル・号・ページ | Structure, Vol. 29, Issue 7, Page 694-708.e7, Year 2021 |
掲載日 | 2021年7月1日 |
著者 | Sarah E Adams / Andrew G Purkiss / Phillip P Knowles / Andrea Nans / David C Briggs / Annabel Borg / Christopher P Earl / Kerry M Goodman / Agata Nawrotek / Aaron J Borg / Pauline B McIntosh / Francesca M Houghton / Svend Kjær / Neil Q McDonald / |
PubMed 要旨 | RET receptor tyrosine kinase plays vital developmental and neuroprotective roles in metazoans. GDNF family ligands (GFLs) when bound to cognate GFRα co-receptors recognize and activate RET ...RET receptor tyrosine kinase plays vital developmental and neuroprotective roles in metazoans. GDNF family ligands (GFLs) when bound to cognate GFRα co-receptors recognize and activate RET stimulating its cytoplasmic kinase function. The principles for RET ligand-co-receptor recognition are incompletely understood. Here, we report a crystal structure of the cadherin-like module (CLD1-4) from zebrafish RET revealing interdomain flexibility between CLD2 and CLD3. Comparison with a cryo-electron microscopy structure of a ligand-engaged zebrafish RET-GDNF-GFRα1a complex indicates conformational changes within a clade-specific CLD3 loop adjacent to the co-receptor. Our observations indicate that RET is a molecular clamp with a flexible calcium-dependent arm that adapts to different GFRα co-receptors, while its rigid arm recognizes a GFL dimer to align both membrane-proximal cysteine-rich domains. We also visualize linear arrays of RET-GDNF-GFRα1a suggesting that a conserved contact stabilizes higher-order species. Our study reveals that ligand-co-receptor recognition by RET involves both receptor plasticity and strict spacing of receptor dimers by GFL ligands. |
リンク | Structure / PubMed:33484636 / PubMed Central |
手法 | EM (単粒子) / X線回折 |
解像度 | 2.2 - 26.0 Å |
構造データ | EMDB-11777: EMDB-11822, PDB-7aml: PDB-7ab8: PDB-7amk: |
化合物 | ChemComp-EDO: ChemComp-PEG: ChemComp-HOH: ChemComp-CA: ChemComp-NAG: ChemComp-GOL: ChemComp-PGE: ChemComp-MES: |
由来 |
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キーワード | SIGNALING PROTEIN / VERTEBRATE DEVELOPMENT / PART OF THE RET-GFL-GFRA COMPLEX / NEUROTROPHIC FACTOR / Ligand recognition / receptor tyrosine kinase / glycosylation |