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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 protein acetylation / ATF6-mediated unfolded protein response / response to insulin-like growth factor stimulus / positive regulation of vascular wound healing / 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 protein acetylation / ATF6-mediated unfolded protein response / response to insulin-like growth factor stimulus / positive regulation of vascular wound healing / 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 / exocrine pancreas development / cellular response to fluid shear stress / positive regulation of MHC class II biosynthetic process / negative regulation of endoplasmic reticulum unfolded protein response / positive regulation of vascular associated smooth muscle cell migration / endothelial cell proliferation / ribosomal subunit / positive regulation of hepatocyte proliferation / cellular response to peptide hormone stimulus / exit from mitosis / positive regulation of T cell differentiation / positive regulation of B cell differentiation / optic nerve development / positive regulation of immunoglobulin production / retinal ganglion cell axon guidance / muscle organ development / negative regulation of SMAD protein signal transduction / IRE1-mediated unfolded protein response / positive regulation of signal transduction by p53 class mediator / ubiquitin ligase inhibitor activity / intrinsic apoptotic signaling pathway in response to endoplasmic reticulum stress / positive regulation of endothelial cell apoptotic process / cellular response to vascular endothelial growth factor stimulus / phagocytic cup / positive regulation of TOR signaling / 90S preribosome / positive regulation of fat cell differentiation / adipose tissue development / fatty acid homeostasis / vascular endothelial growth factor receptor signaling pathway / neuron development / 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 / rough endoplasmic reticulum / translation regulator activity / positive regulation of vascular associated smooth muscle cell proliferation / ERAD pathway / positive regulation of autophagy / gastrulation / MDM2/MDM4 family protein binding / cytosolic ribosome / class I DNA-(apurinic or apyrimidinic site) endonuclease activity / DNA-(apurinic or apyrimidinic site) lyase / cellular response to interleukin-4 / response to endoplasmic reticulum stress / cellular response to leukemia inhibitory factor / cholesterol homeostasis / liver development / maturation of LSU-rRNA from tricistronic rRNA transcript (SSU-rRNA, 5.8S rRNA, LSU-rRNA) / 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) / RNA polymerase II transcription regulatory region sequence-specific DNA binding / nuclear estrogen receptor binding / maturation of SSU-rRNA / phosphatidylinositol 3-kinase/protein kinase B signal transduction / cellular response to amino acid stimulus / small-subunit processome / regulation of cell growth / negative regulation of transforming growth factor beta receptor signaling pathway / cellular response to glucose stimulus / protein destabilization / negative regulation of ERK1 and ERK2 cascade / regulation of protein stability / chromatin DNA binding / autophagy / positive regulation of interleukin-6 production / spindle / mRNA 5'-UTR binding / RNA polymerase II transcription regulator complex / positive regulation of protein import into nucleus / cellular response to insulin stimulus / positive regulation of angiogenesis / rRNA processing / fatty acid biosynthetic process / sequence-specific double-stranded DNA binding / rhythmic process / positive regulation of canonical Wnt signaling pathway 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
Arichive directory | ![]() ![]() | HTTPS FTP |
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-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 |