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-Structure paper
| タイトル | Mechanistic insights into TTLL11 polyglutamylase-mediated primary tubulin chain elongation. |
|---|---|
| ジャーナル・号・ページ | Sci Adv, Vol. 11, Issue 34, Page eadw1561, Year 2025 |
| 掲載日 | 2025年8月22日 |
著者 | Jana Campbell / Miroslava Vosahlikova / Samar Ismail / Margareta Volnikova / Lucia Motlova / Julia Kudlacova / Kseniya Ustinova / Ivan Snajdr / Zora Novakova / Miroslav Basta / Irina Gutsche / Marie-Jo Moutin / Ambroise Desfosses / Cyril Barinka / ![]() |
| PubMed 要旨 | Microtubules (MTs) undergo diverse posttranslational modifications that regulate their structural and functional properties. Among these, polyglutamylation-a dominant and conserved modification ...Microtubules (MTs) undergo diverse posttranslational modifications that regulate their structural and functional properties. Among these, polyglutamylation-a dominant and conserved modification targeting unstructured tubulin C-terminal tails-plays a pivotal role in defining the tubulin code. Here, we describe a mechanism by which tubulin tyrosine ligase-like 11 (TTLL11) expands and diversifies the code. Cryo-electron microscopy revealed a unique bipartite MT recognition strategy wherein TTLL11 binding and catalytic domains engage adjacent MT protofilaments. Biochemical and cellular assays identified previously uncharacterized polyglutamylation patterns, showing that TTLL11 directly extends the primary polypeptide chains of α- and β-tubulin in vitro, challenging the prevailing paradigms emphasizing lateral branching. Moreover, cell-based and in vivo data suggest a cross-talk between polyglutamylation and the detyrosination/tyrosination cycle likely linked to the TTLL11-mediated elongation of the primary α-tubulin chain. These findings unveil an unrecognized layer of complexity within the tubulin code and offer mechanistic insights into the molecular basis of functional specialization of MT cytoskeleton. |
リンク | Sci Adv / PubMed:40834096 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 3.28 Å |
| 構造データ | EMDB-52338, PDB-9hq4: |
| 化合物 | ![]() ChemComp-G2P: ![]() ChemComp-MG: ![]() ChemComp-TA1: |
| 由来 |
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キーワード | LIGASE / TTLL11 / polyglutamylase / tubulin / microtubule |
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