ジャーナル: Elife / 年: 2020 タイトル: Structure of substrate-bound SMG1-8-9 kinase complex reveals molecular basis for phosphorylation specificity. 著者: Lukas M Langer / Yair Gat / Fabien Bonneau / Elena Conti / 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.
Serine/threonine-proteinkinaseSMG1,Serine/threonine-proteinkinaseSMG1,SMG1,Serine/threonine-proteinkinaseSMG1,Serine/threonine-proteinkinaseSMG1,Serine/threonine-proteinkinaseSMG1 / hSMG-1 / 61E3.4 / Lambda/iota protein kinase C-interacting protein / Lambda-interacting protein
分子量: 379584.781 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) Homo sapiens (ヒト) / 遺伝子: SMG1, ATX, KIAA0421, LIP / 細胞株 (発現宿主): HEK293T / 発現宿主: Homo sapiens (ヒト) 参照: UniProt: Q96Q15, non-specific serine/threonine protein kinase
#2: タンパク質
ProteinSMG8 / Amplified in breast cancer gene 2 protein / Protein smg-8 homolog