Recycling of Aborted Ribosomal 50S Subunit-Nascent Chain-tRNA Complexes by the Heat Shock Protein Hsp15.
Map data
EM map of 50S.nc-tRNA.Hsp15
Sample
Sample: 50S E.coli ribosomal subunit in complex with nascent chain-tRNA and Hsp15
Complex: 50S ribosomal subunitProkaryotic large ribosomal subunit
RNA: nascent chain-tRNA
Protein or peptide: Heat Shock Protein 15Heat shock response
Function / homology
Function and homology information
negative regulation of cytoplasmic translational initiation / transcriptional attenuation / endoribonuclease inhibitor activity / RNA-binding transcription regulator activity / positive regulation of ribosome biogenesis / negative regulation of cytoplasmic translation / DnaA-L2 complex / translation repressor activity / translational initiation / negative regulation of DNA-templated DNA replication initiation ...negative regulation of cytoplasmic translational initiation / transcriptional attenuation / endoribonuclease inhibitor activity / RNA-binding transcription regulator activity / positive regulation of ribosome biogenesis / negative regulation of cytoplasmic translation / DnaA-L2 complex / translation repressor activity / translational initiation / negative regulation of DNA-templated DNA replication initiation / ribosome assembly / mRNA regulatory element binding translation repressor activity / response to reactive oxygen species / assembly of large subunit precursor of preribosome / : / cytosolic ribosome assembly / regulation of cell growth / DNA-templated transcription termination / response to radiation / mRNA 5'-UTR binding / ribosomal large subunit assembly / large ribosomal subunit rRNA binding / ribosome binding / large ribosomal subunit / 5S rRNA binding / cytosolic large ribosomal subunit / cytoplasmic translation / transferase activity / tRNA binding / negative regulation of translation / rRNA binding / ribosome / structural constituent of ribosome / translation / response to antibiotic / mRNA binding / negative regulation of DNA-templated transcription / DNA binding / RNA binding / zinc ion binding / cytosol / cytoplasm Similarity search - Function
Ribosomal protein L25, short-form / Ribosomal protein L31 type A / Ribosomal protein L31 signature. / Ribosomal protein L31 / Ribosomal protein L31 superfamily / Ribosomal protein L31 / Ribosomal protein L21, conserved site / Ribosomal protein L21 signature. / Ribosomal protein L16 signature 1. / : ...Ribosomal protein L25, short-form / Ribosomal protein L31 type A / Ribosomal protein L31 signature. / Ribosomal protein L31 / Ribosomal protein L31 superfamily / Ribosomal protein L31 / Ribosomal protein L21, conserved site / Ribosomal protein L21 signature. / Ribosomal protein L16 signature 1. / : / Ribosomal protein L6, conserved site / Ribosomal protein L6 signature 1. / Ribosomal protein L16, conserved site / Ribosomal protein L16 signature 2. / Ribosomal protein L17 signature. / Ribosomal protein L9 signature. / Ribosomal protein L9, bacteria/chloroplast / Ribosomal protein L9, C-terminal / Ribosomal protein L9, C-terminal domain / Ribosomal protein L9, C-terminal domain superfamily / Ribosomal L25p family / Ribosomal protein L25 / Ribosomal protein L36 signature. / Ribosomal protein L25/Gln-tRNA synthetase, N-terminal / Ribosomal protein L32p, bacterial type / Ribosomal protein L25/Gln-tRNA synthetase, anti-codon-binding domain superfamily / Ribosomal protein L9, N-terminal domain superfamily / Ribosomal protein L9 / Ribosomal protein L9, N-terminal / Ribosomal protein L9, N-terminal domain / Ribosomal protein L35, conserved site / Ribosomal protein L35 signature. / Ribosomal protein L33, conserved site / Ribosomal protein L33 signature. / Ribosomal protein L35, non-mitochondrial / Ribosomal protein L5, bacterial-type / Ribosomal protein L6, bacterial-type / Ribosomal protein L18, bacterial-type / Ribosomal protein L19, conserved site / Ribosomal protein L19 signature. / Ribosomal protein L36 / Ribosomal protein L36 superfamily / Ribosomal protein L36 / Ribosomal protein L9/RNase H1, N-terminal / Ribosomal protein L20 signature. / Ribosomal protein L27, conserved site / Ribosomal protein L27 signature. / Ribosomal protein L14P, bacterial-type / Ribosomal protein L34, conserved site / Ribosomal protein L34 signature. / Ribosomal protein L22, bacterial/chloroplast-type / Ribosomal protein L35 / Ribosomal protein L35 superfamily / Ribosomal protein L2, bacterial/organellar-type / Ribosomal protein L35 / Ribosomal protein L33 / Ribosomal protein L33 / Ribosomal protein L33 superfamily / : / Ribosomal protein L30, bacterial-type / Ribosomal protein L16 / Ribosomal protein L18 / Ribosomal L18 of archaea, bacteria, mitoch. and chloroplast / L28p-like / Ribosomal protein L20 / Ribosomal protein L20 / Ribosomal protein L20, C-terminal / Ribosomal protein L21 / Ribosomal protein L27 / Ribosomal L27 protein / Ribosomal protein L19 / Ribosomal protein L19 superfamily / Ribosomal protein L19 / Ribosomal proteins 50S L24/mitochondrial 39S L24 / Ribosomal protein L17 / Ribosomal protein L17 superfamily / Ribosomal protein L17 / Ribosomal protein L21-like / L21-like superfamily / Ribosomal prokaryotic L21 protein / Ribosomal L32p protein family / Ribosomal protein L24 / Ribosomal protein L32p / Ribosomal protein L34 / Ribosomal protein L34 / Ribosomal protein L13, bacterial-type / Ribosomal protein L23/L25, conserved site / Ribosomal protein L3, bacterial/organelle-type / Ribosomal protein L15, bacterial-type / 50S ribosomal protein uL4 / Ribosomal protein L23 signature. / Ribosomal protein L30, conserved site / Ribosomal protein L5, conserved site / Ribosomal protein L29, conserved site / Ribosomal protein L30 signature. / : / Ribosomal protein L5, N-terminal / Ribosomal protein L5 signature. / Ribosomal protein L15, conserved site / Ribosomal protein L5, C-terminal Similarity search - Domain/homology
50S ribosomal protein L6 / 50S ribosomal protein L13 / 50S ribosomal protein L14 / Large ribosomal subunit protein uL15 / 50S ribosomal protein L16 / 50S ribosomal protein L17 / 50S ribosomal protein L21 / 50S ribosomal protein L23 / 50S ribosomal protein L30 / Large ribosomal subunit protein bL19 ...50S ribosomal protein L6 / 50S ribosomal protein L13 / 50S ribosomal protein L14 / Large ribosomal subunit protein uL15 / 50S ribosomal protein L16 / 50S ribosomal protein L17 / 50S ribosomal protein L21 / 50S ribosomal protein L23 / 50S ribosomal protein L30 / Large ribosomal subunit protein bL19 / Large ribosomal subunit protein bL20 / Large ribosomal subunit protein bL27 / Large ribosomal subunit protein uL29 / Large ribosomal subunit protein bL31 / Large ribosomal subunit protein bL32 / Large ribosomal subunit protein bL33 / Large ribosomal subunit protein bL34 / Large ribosomal subunit protein bL35 / Large ribosomal subunit protein bL36A / Large ribosomal subunit protein bL9 / Large ribosomal subunit protein uL13 / Large ribosomal subunit protein uL14 / Large ribosomal subunit protein uL16 / Large ribosomal subunit protein uL23 / Large ribosomal subunit protein bL17 / Large ribosomal subunit protein bL21 / Large ribosomal subunit protein uL30 / Large ribosomal subunit protein uL6 / Large ribosomal subunit protein uL18 / Large ribosomal subunit protein uL2 / Large ribosomal subunit protein uL3 / Large ribosomal subunit protein uL24 / Large ribosomal subunit protein uL4 / Large ribosomal subunit protein uL22 / Large ribosomal subunit protein uL5 / Large ribosomal subunit protein bL25 Similarity search - Component
Biological species
Escherichia coli (E. coli)
Method
single particle reconstruction / cryo EM / Resolution: 10.0 Å
Journal: J Mol Biol / Year: 2009 Title: Recycling of aborted ribosomal 50S subunit-nascent chain-tRNA complexes by the heat shock protein Hsp15. Authors: Linhua Jiang / Christiane Schaffitzel / Rouven Bingel-Erlenmeyer / Nenad Ban / Philipp Korber / Roman I Koning / Daniël C de Geus / Jasper R Plaisier / Jan Pieter Abrahams / Abstract: When heat shock prematurely dissociates a translating bacterial ribosome, its 50S subunit is prevented from reinitiating protein synthesis by tRNA covalently linked to the unfinished protein chain ...When heat shock prematurely dissociates a translating bacterial ribosome, its 50S subunit is prevented from reinitiating protein synthesis by tRNA covalently linked to the unfinished protein chain that remains threaded through the exit tunnel. Hsp15, a highly upregulated bacterial heat shock protein, reactivates such dead-end complexes. Here, we show with cryo-electron microscopy reconstructions and functional assays that Hsp15 translocates the tRNA moiety from the A site to the P site of stalled 50S subunits. By stabilizing the tRNA in the P site, Hsp15 indirectly frees up the A site, allowing a release factor to land there and cleave off the tRNA. Such a release factor must be stop codon independent, suggesting a possible role for a poorly characterized class of putative release factors that are upregulated by cellular stress, lack a codon recognition domain and are conserved in eukaryotes.
History
Deposition
Nov 9, 2007
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Header (metadata) release
Nov 9, 2007
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Map release
Nov 24, 2008
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Update
Sep 19, 2012
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Current status
Sep 19, 2012
Processing site: PDBe / Status: Released
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Structure visualization
Movie
Surface view with section colored by density value
Name: nascent chain-tRNA / type: rna / ID: 1 / Classification: TRANSFER / Structure: SINGLE STRANDED / Synthetic?: No
Source (natural)
Organism: Escherichia coli (E. coli)
Molecular weight
Experimental: 30 KDa
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Macromolecule #2: Heat Shock Protein 15
Macromolecule
Name: Heat Shock Protein 15 / type: protein_or_peptide / ID: 2 / Number of copies: 1 / Oligomeric state: Mono / Recombinant expression: No
Source (natural)
Organism: Escherichia coli (E. coli)
Molecular weight
Experimental: 15 KDa
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Experimental details
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Structure determination
Method
cryo EM
Processing
single particle reconstruction
Aggregation state
particle
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Sample preparation
Vitrification
Cryogen name: ETHANE
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Electron microscopy
Microscope
FEI TECNAI 20
Electron beam
Acceleration voltage: 200 kV / Electron source: FIELD EMISSION GUN
Electron optics
Illumination mode: OTHER / Imaging mode: BRIGHT FIELDBright-field microscopy
Sample stage
Specimen holder model: OTHER
Image recording
Digitization - Scanner: OTHER / Number real images: 112 / Details: Nikon super coolscan 9000 / Bits/pixel: 8
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Image processing
CTF correction
Details: Each particle
Final angle assignment
Details: EMAN:angle ~4 degrees
Final reconstruction
Applied symmetry - Point group: C1 (asymmetric) / Algorithm: OTHER / Resolution.type: BY AUTHOR / Resolution: 10.0 Å / Resolution method: FSC 0.5 CUT-OFF / Software - Name: EMAN / Details: Final maps were calculated by "refine" subprogram
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Atomic model buiding 1
Software
Name: Situs, LocalFit
Details
Protocol: multi-rigid body refinement. The domains were separately fitted manually, then optimized by Situs and LocalFit
Refinement
Protocol: RIGID BODY FIT / Target criteria: R-factor
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