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- PDB-6xa1: Structure of a drug-like compound stalled human translation termi... -
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Basic information
Entry | Database: PDB / ID: 6xa1 | |||||||||
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Title | Structure of a drug-like compound stalled human translation termination complex | |||||||||
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![]() | RIBOSOME / Selectively stalling / translation termination / drug-like compound / human ribosome | |||||||||
Function / homology | ![]() translation termination factor activity / translation release factor complex / cytoplasmic translational termination / regulation of translational termination / translation release factor activity, codon specific / protein methylation / translation release factor activity / eukaryotic 80S initiation complex / negative regulation of protein neddylation / oxidized pyrimidine DNA binding ...translation termination factor activity / translation release factor complex / cytoplasmic translational termination / regulation of translational termination / translation release factor activity, codon specific / protein methylation / translation release factor activity / eukaryotic 80S initiation complex / negative regulation of protein neddylation / oxidized pyrimidine DNA binding / response to TNF agonist / positive regulation of base-excision repair / negative regulation of endoplasmic reticulum unfolded protein response / negative regulation of peptidyl-serine phosphorylation / regulation of G1 to G0 transition / axial mesoderm development / negative regulation of formation of translation preinitiation complex / positive regulation of intrinsic apoptotic signaling pathway in response to DNA damage / positive regulation of respiratory burst involved in inflammatory response / ribosomal protein import into nucleus / positive regulation of intrinsic apoptotic signaling pathway in response to DNA damage by p53 class mediator / regulation of translation involved in cellular response to UV / positive regulation of gastrulation / regulation of adenylate cyclase-activating G protein-coupled receptor signaling pathway / protein-DNA complex disassembly / protein tyrosine kinase inhibitor activity / 90S preribosome assembly / IRE1-RACK1-PP2A complex / positive regulation of endodeoxyribonuclease activity / nucleolus organization / positive regulation of Golgi to plasma membrane protein transport / sequence-specific mRNA binding / translation at postsynapse / TNFR1-mediated ceramide production / negative regulation of DNA repair / negative regulation of RNA splicing / mammalian oogenesis stage / GAIT complex / A band / peptidyl-tRNA hydrolase activity / positive regulation of DNA damage response, signal transduction by p53 class mediator / supercoiled DNA binding / activation-induced cell death of T cells / TORC2 complex binding / neural crest cell differentiation / NF-kappaB complex / G1 to G0 transition / oxidized purine DNA binding / nuclear-transcribed mRNA catabolic process, nonsense-mediated decay / cysteine-type endopeptidase activator activity involved in apoptotic process / middle ear morphogenesis / exit from mitosis / negative regulation of intrinsic apoptotic signaling pathway in response to hydrogen peroxide / ubiquitin-like protein conjugating enzyme binding / regulation of establishment of cell polarity / translation at presynapse / positive regulation of ubiquitin-protein transferase activity / Formation of the ternary complex, and subsequently, the 43S complex / erythrocyte homeostasis / negative regulation of phagocytosis / rRNA modification in the nucleus and cytosol / optic nerve development / cytoplasmic side of rough endoplasmic reticulum membrane / laminin receptor activity / protein kinase A binding / retinal ganglion cell axon guidance / negative regulation of ubiquitin protein ligase activity / pigmentation / Ribosomal scanning and start codon recognition / ion channel inhibitor activity / homeostatic process / Translation initiation complex formation / response to aldosterone / positive regulation of mitochondrial depolarization / positive regulation of T cell receptor signaling pathway / macrophage chemotaxis / positive regulation of activated T cell proliferation / fibroblast growth factor binding / negative regulation of Wnt signaling pathway / lung morphogenesis / male meiosis I / monocyte chemotaxis / negative regulation of translational frameshifting / Protein hydroxylation / BH3 domain binding / TOR signaling / SARS-CoV-1 modulates host translation machinery / regulation of cell division / mTORC1-mediated signalling / T cell proliferation involved in immune response / Peptide chain elongation / iron-sulfur cluster binding / positive regulation of intrinsic apoptotic signaling pathway by p53 class mediator / Selenocysteine synthesis / positive regulation of signal transduction by p53 class mediator / Formation of a pool of free 40S subunits / endonucleolytic cleavage to generate mature 3'-end of SSU-rRNA from (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / ubiquitin ligase inhibitor activity / Eukaryotic Translation Termination / Response of EIF2AK4 (GCN2) to amino acid deficiency Similarity search - Function | |||||||||
Biological species | ![]() | |||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.8 Å | |||||||||
![]() | Li, W. / Cate, J. | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Selective inhibition of human translation termination by a drug-like compound. Authors: Wenfei Li / Stacey Tsai-Lan Chang / Fred R Ward / Jamie H D Cate / ![]() Abstract: Methods to directly inhibit gene expression using small molecules hold promise for the development of new therapeutics targeting proteins that have evaded previous attempts at drug discovery. Among ...Methods to directly inhibit gene expression using small molecules hold promise for the development of new therapeutics targeting proteins that have evaded previous attempts at drug discovery. Among these, small molecules including the drug-like compound PF-06446846 (PF846) selectively inhibit the synthesis of specific proteins, by stalling translation elongation. These molecules also inhibit translation termination by an unknown mechanism. Using cryo-electron microscopy (cryo-EM) and biochemical approaches, we show that PF846 inhibits translation termination by arresting the nascent chain (NC) in the ribosome exit tunnel. The arrested NC adopts a compact α-helical conformation that induces 28 S rRNA nucleotide rearrangements that suppress the peptidyl transferase center (PTC) catalytic activity stimulated by eukaryotic release factor 1 (eRF1). These data support a mechanism of action for a small molecule targeting translation that suppresses peptidyl-tRNA hydrolysis promoted by eRF1, revealing principles of eukaryotic translation termination and laying the foundation for new therapeutic strategies. | |||||||||
History |
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Structure visualization
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Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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PDBx/mmCIF format | ![]() | 4.6 MB | Display | ![]() |
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PDB format | ![]() | Display | ![]() | |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
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-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 22085MC M: map data used to model this data C: citing same article ( |
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Similar structure data |
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Links
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Assembly
Deposited unit | ![]()
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Components
+60S ribosomal protein ... , 41 types, 41 molecules LALBLCLDLELFLGLHLILJLLLMLNLOLPLQLRLSLTLVLWLXLYLZLaLbLcLdLeLf...
-RNA chain , 6 types, 6 molecules L5L7L8S2Bvk
#3: RNA chain | Mass: 1138224.750 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Details: 28SrRNA with PF846 / Source: (gene. exp.) ![]() ![]() |
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#4: RNA chain | Mass: 38691.914 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() |
#5: RNA chain | Mass: 49852.496 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() |
#46: RNA chain | Mass: 514092.625 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() |
#80: RNA chain | Mass: 24641.777 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() |
#82: RNA chain | Mass: 4047.445 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() |
-Protein , 3 types, 3 molecules LUSgj
#23: Protein | Mass: 11722.535 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() |
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#67: Protein | Mass: 34669.113 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() |
#81: Protein | Mass: 46149.758 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() |
+40S ribosomal protein ... , 32 types, 32 molecules SASBSDSESFSHSISKSLSPSQSRSSSTSUSVSXSaScSdSCSGSJSMSNSOSWSYSZSbSeSf
-Protein/peptide , 1 types, 1 molecules NC
#83: Protein/peptide | Mass: 2523.151 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() |
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-Non-polymers , 4 types, 201 molecules 






#84: Chemical | ChemComp-MG / #85: Chemical | ChemComp-MVM / | #86: Chemical | ChemComp-ZN / #87: Chemical | |
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-Details
Has ligand of interest | Y |
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Has protein modification | Y |
-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
Component | Name: Drug-like compound-stalled translation termination complex Type: RIBOSOME / Entity ID: #1-#83 / Source: RECOMBINANT |
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Source (natural) | Organism: ![]() |
Source (recombinant) | Organism: ![]() |
Buffer solution | pH: 7.6 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Specimen support | Details: unspecified |
Vitrification | Cryogen name: ETHANE |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD |
Image recording | Electron dose: 50 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k) |
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Processing
CTF correction | Type: NONE |
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3D reconstruction | Resolution: 2.8 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 57324 / Symmetry type: POINT |