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-Structure paper
| タイトル | Structure of substrate-bound SMG1-8-9 kinase complex reveals molecular basis for phosphorylation specificity. |
|---|---|
| ジャーナル・号・ページ | Elife, Vol. 9, Year 2020 |
| 掲載日 | 2020年5月29日 |
著者 | Lukas M Langer / Yair Gat / Fabien Bonneau / Elena Conti / ![]() |
| PubMed 要旨 | PI3K-related kinases (PIKKs) are large Serine/Threonine (Ser/Thr)-protein kinases central to the regulation of many fundamental cellular processes. PIKK family member SMG1 orchestrates progression of ...PI3K-related kinases (PIKKs) are large Serine/Threonine (Ser/Thr)-protein kinases central to the regulation of many fundamental cellular processes. PIKK family member SMG1 orchestrates progression of an RNA quality control pathway, termed nonsense-mediated mRNA decay (NMD), by phosphorylating the NMD factor UPF1. Phosphorylation of UPF1 occurs in its unstructured N- and C-terminal regions at Serine/Threonine-Glutamine (SQ) motifs. How SMG1 and other PIKKs specifically recognize SQ motifs has remained unclear. Here, we present a cryo-electron microscopy (cryo-EM) reconstruction of a human SMG1-8-9 kinase complex bound to a UPF1 phosphorylation site at an overall resolution of 2.9 Å. This structure provides the first snapshot of a human PIKK with a substrate-bound active site. Together with biochemical assays, it rationalizes how SMG1 and perhaps other PIKKs specifically phosphorylate Ser/Thr-containing motifs with a glutamine residue at position +1 and a hydrophobic residue at position -1, thus elucidating the molecular basis for phosphorylation site recognition. |
リンク | Elife / PubMed:32469312 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.97 Å |
| 構造データ | EMDB-11063, PDB-6z3r: |
| 化合物 | ![]() ChemComp-ANP: ![]() ChemComp-IHP: ![]() ChemComp-ATP: ![]() ChemComp-MG: |
| 由来 |
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キーワード | TRANSFERASE / Cryo-EM / Structural Biology / Nonsense-mediated mRNA decay / RNA quality control / PIKK / NMD / Substrate / Phosphorylation |
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