6SYT image
Deposition Date 2019-10-01
Release Date 2019-12-11
Last Version Date 2024-05-22
Entry Detail
PDB ID:
6SYT
Keywords:
SIGNALING PROTEIN
Title:
Structure of the SMG1-SMG8-SMG9 complex
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
Host Organism:
Homo sapiens
Method Details:
Experimental Method:
ELECTRON MICROSCOPY
Resolution:
3.45 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
6SYT validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Molecule:SMG1,Serine/threonine-protein kinase SMG1,SMG1,Serine/threonine-protein kinase SMG1,SMG1,Serine/threonine-protein kinase SMG1,SMG1,Serine/threonine-protein kinase SMG1,SMG1,Serine/threonine-protein kinase SMG1
Gene (Uniprot):SMG1
Mutations:D2335A,D2335A,D2335A,D2335A,D2335A,D2335A,D2335A,D2335A,D2335A,D2335A
Chain IDs:A
Chain Length:3712
Number of Molecules:1
Biological Source:Homo sapiens
UniProt ID:Q96Q15 Pfam ID:PF15785, PF00454, PF02260 EC:2.7.11.1
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Protein SMG8
Gene (Uniprot):SMG8
Chain IDs:B
Chain Length:991
Number of Molecules:1
Biological Source:Homo sapiens
UniProt ID:Q8ND04 Pfam ID:PF10220
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Protein SMG9
Gene (Uniprot):SMG9
Chain IDs:C
Chain Length:520
Number of Molecules:1
Biological Source:Homo sapiens
UniProt ID:Q9H0W8
Ligand Molecules
ATP
IHP
MG
Primary Citation
InsP6binding to PIKK kinases revealed by the cryo-EM structure of an SMG1-SMG8-SMG9 complex.
Nat.Struct.Mol.Biol. 26 1089 1093 (2019)
PMID: 31792449 DOI: 10.1038/s41594-019-0342-7

Abstact

We report the 3.45-Å resolution cryo-EM structure of human SMG1-SMG8-SMG9, a phosphatidylinositol-3-kinase (PI(3)K)-related protein kinase (PIKK) complex central to messenger RNA surveillance. Structural and MS analyses reveal the presence of inositol hexaphosphate (InsP6) in the SMG1 kinase. We show that the InsP6-binding site is conserved in mammalian target of rapamycin (mTOR) and potentially other PIKK members, and that it is required for optimal in vitro phosphorylation of both SMG1 and mTOR substrates.

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Primary Citation of related structures
6SYT