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- PDB-6r6p: Structure of XBP1u-paused ribosome nascent chain complex (rotated... -
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Basic information
Entry | Database: PDB / ID: 6r6p | ||||||
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Title | Structure of XBP1u-paused ribosome nascent chain complex (rotated state) | ||||||
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![]() | RIBOSOME / translational pausing / XBP1 / UPR | ||||||
Function / homology | ![]() epithelial cell maturation involved in salivary gland development / positive regulation of vascular wound healing / ATF6-mediated unfolded protein response / positive regulation of protein acetylation / response to insulin-like growth factor stimulus / glandular epithelial cell maturation / sterol homeostasis / positive regulation of lactation / IRE1alpha activates chaperones / ATF6 (ATF6-alpha) activates chaperone genes ...epithelial cell maturation involved in salivary gland development / positive regulation of vascular wound healing / ATF6-mediated unfolded protein response / positive regulation of protein acetylation / response to insulin-like growth factor stimulus / glandular epithelial cell maturation / sterol homeostasis / positive regulation of lactation / IRE1alpha activates chaperones / ATF6 (ATF6-alpha) activates chaperone genes / positive regulation of plasma cell differentiation / positive regulation of phospholipid biosynthetic process / positive regulation of ERAD pathway / negative regulation of myotube differentiation / intracellular triglyceride homeostasis / cellular response to fructose stimulus / cellular response to laminar fluid shear stress / XBP1(S) activates chaperone genes / cellular response to nutrient / positive regulation of hepatocyte proliferation / cellular response to fluid shear stress / positive regulation of MHC class II biosynthetic process / negative regulation of endoplasmic reticulum unfolded protein response / exocrine pancreas development / positive regulation of vascular associated smooth muscle cell migration / endothelial cell proliferation / ribosomal subunit / positive regulation of T cell differentiation / cellular response to peptide hormone stimulus / positive regulation of B cell differentiation / positive regulation of immunoglobulin production / muscle organ development / IRE1-mediated unfolded protein response / negative regulation of SMAD protein signal transduction / ubiquitin ligase inhibitor activity / positive regulation of endothelial cell apoptotic process / intrinsic apoptotic signaling pathway in response to endoplasmic reticulum stress / positive regulation of signal transduction by p53 class mediator / cellular response to vascular endothelial growth factor stimulus / positive regulation of TOR signaling / positive regulation of fat cell differentiation / 90S preribosome / adipose tissue development / fatty acid homeostasis / vascular endothelial growth factor receptor signaling pathway / neuron development / phagocytic cup / negative regulation of endoplasmic reticulum stress-induced intrinsic apoptotic signaling pathway / endoplasmic reticulum unfolded protein response / cellular response to glucose starvation / cis-regulatory region sequence-specific DNA binding / ribosomal small subunit export from nucleus / positive regulation of vascular associated smooth muscle cell proliferation / rough endoplasmic reticulum / translation regulator activity / ERAD pathway / gastrulation / MDM2/MDM4 family protein binding / positive regulation of autophagy / cytosolic ribosome / cellular response to interleukin-4 / class I DNA-(apurinic or apyrimidinic site) endonuclease activity / DNA-(apurinic or apyrimidinic site) lyase / response to endoplasmic reticulum stress / cholesterol homeostasis / maturation of LSU-rRNA from tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / cellular response to leukemia inhibitory factor / ribosomal large subunit biogenesis / positive regulation of apoptotic signaling pathway / maturation of SSU-rRNA from tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / nuclear estrogen receptor binding / maturation of SSU-rRNA / RNA polymerase II transcription regulatory region sequence-specific DNA binding / cellular response to amino acid stimulus / small-subunit processome / regulation of cell growth / cellular response to glucose stimulus / phosphatidylinositol 3-kinase/protein kinase B signal transduction / negative regulation of transforming growth factor beta receptor signaling pathway / chromatin DNA binding / liver development / protein destabilization / regulation of protein stability / negative regulation of ERK1 and ERK2 cascade / autophagy / positive regulation of interleukin-6 production / positive regulation of protein import into nucleus / spindle / RNA polymerase II transcription regulator complex / positive regulation of protein phosphorylation / cellular response to insulin stimulus / positive regulation of angiogenesis / rRNA processing / sequence-specific double-stranded DNA binding / fatty acid biosynthetic process / rhythmic process / positive regulation of canonical Wnt signaling pathway / protein transport / ribosome biogenesis / heparin binding Similarity search - Function | ||||||
Biological species | ![]() ![]() ![]() ![]() ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.1 Å | ||||||
![]() | Shanmuganathan, V. / Cheng, J. / Berninghausen, O. / Beckmann, R. | ||||||
Funding support | ![]()
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![]() | ![]() Title: Structural and mutational analysis of the ribosome-arresting human XBP1u. Authors: Vivekanandan Shanmuganathan / Nina Schiller / Anastasia Magoulopoulou / Jingdong Cheng / Katharina Braunger / Florian Cymer / Otto Berninghausen / Birgitta Beatrix / Kenji Kohno / Gunnar von ...Authors: Vivekanandan Shanmuganathan / Nina Schiller / Anastasia Magoulopoulou / Jingdong Cheng / Katharina Braunger / Florian Cymer / Otto Berninghausen / Birgitta Beatrix / Kenji Kohno / Gunnar von Heijne / Roland Beckmann / ![]() ![]() ![]() Abstract: XBP1u, a central component of the unfolded protein response (UPR), is a mammalian protein containing a functionally critical translational arrest peptide (AP). Here, we present a 3 Å cryo-EM ...XBP1u, a central component of the unfolded protein response (UPR), is a mammalian protein containing a functionally critical translational arrest peptide (AP). Here, we present a 3 Å cryo-EM structure of the stalled human XBP1u AP. It forms a unique turn in the ribosomal exit tunnel proximal to the peptidyl transferase center where it causes a subtle distortion, thereby explaining the temporary translational arrest induced by XBP1u. During ribosomal pausing the hydrophobic region 2 (HR2) of XBP1u is recognized by SRP, but fails to efficiently gate the Sec61 translocon. An exhaustive mutagenesis scan of the XBP1u AP revealed that only 8 out of 20 mutagenized positions are optimal; in the remaining 12 positions, we identify 55 different mutations increase the level of translational arrest. Thus, the wildtype XBP1u AP induces only an intermediate level of translational arrest, allowing efficient targeting by SRP without activating the Sec61 channel. | ||||||
History |
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Structure visualization
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Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 4.7 MB | Display | ![]() |
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PDB format | ![]() | Display | ![]() | |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
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-Validation report
Summary document | ![]() | 1.5 MB | Display | ![]() |
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Full document | ![]() | 1.7 MB | Display | |
Data in XML | ![]() | 349.2 KB | Display | |
Data in CIF | ![]() | 598.1 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 4737MC ![]() 4729C ![]() 4735C ![]() 4745C ![]() 6r5qC ![]() 6r6gC ![]() 6r7qC C: citing same article ( M: map data used to model this data |
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Similar structure data |
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Links
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Assembly
Deposited unit | ![]()
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1 |
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Components
-RNA chain , 7 types, 7 molecules 57823K4
#1: RNA chain | Mass: 1186579.500 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
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#2: RNA chain | Mass: 38691.914 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#3: RNA chain | Mass: 50143.648 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#49: RNA chain | Mass: 24414.496 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#50: RNA chain | Mass: 24148.355 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#51: RNA chain | Mass: 548024.188 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#85: RNA chain | Mass: 3145.932 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) ![]() |
+Protein , 41 types, 41 molecules ABCFGHJOPQRSTVXacdefghkmorsqvMM...
-60S ribosomal protein ... , 7 types, 7 molecules DELZbin
#7: Protein | Mass: 34006.312 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
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#8: Protein | Mass: 28529.848 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#14: Protein | Mass: 24216.525 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#28: Protein | Mass: 15704.635 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#30: Protein | Mass: 8706.283 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#37: Protein | Mass: 11888.371 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#42: Protein/peptide | Mass: 3213.075 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
+Ribosomal protein ... , 21 types, 21 molecules IMNUWYjlptXXEEQQUUTTVVDDBBOOFF6
-Protein/peptide , 1 types, 1 molecules 1
#48: Protein/peptide | Mass: 2895.380 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() |
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-40S ribosomal protein ... , 8 types, 8 molecules uxzyCCJJAARR
#53: Protein | Mass: 24759.145 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
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#55: Protein | Mass: 29523.674 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#56: Protein | Mass: 27471.535 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#57: Protein | Mass: 21629.309 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#58: Protein | Mass: 24003.012 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#70: Protein | Mass: 9348.990 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#71: Protein | Mass: 6317.539 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
#75: Protein | Mass: 13048.244 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() |
-Non-polymers , 2 types, 164 molecules 


#86: Chemical | ChemComp-MG / #87: Chemical | ChemComp-ZN / |
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-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
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Source (natural) |
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Source (recombinant) |
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Buffer solution | pH: 7.5 | ||||||||||||||||||||||||||||||||||||||||||
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES | ||||||||||||||||||||||||||||||||||||||||||
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: 28 e/Å2 / Film or detector model: FEI FALCON II (4k x 4k) |
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Processing
EM software |
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CTF correction | Type: NONE | |||||||||||||||
Symmetry | Point symmetry: C1 (asymmetric) | |||||||||||||||
3D reconstruction | Resolution: 3.1 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 94923 / Symmetry type: POINT | |||||||||||||||
Atomic model building | Protocol: RIGID BODY FIT |