5ZEY

M. smegmatis Trans-translation state 70S ribosome


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 12.5 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

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This is version 1.1 of the entry. See complete history


Literature

Structures of Mycobacterium smegmatis 70S ribosomes in complex with HPF, tmRNA, and P-tRNA.

Mishra, S.Ahmed, T.Tyagi, A.Shi, J.Bhushan, S.

(2018) Sci Rep 8: 13587-13587

  • DOI: 10.1038/s41598-018-31850-3
  • Primary Citation of Related Structures:  
    5ZEY, 5ZEP, 5ZEU, 5ZET, 5ZEB

  • PubMed Abstract: 
  • Ribosomes are the dynamic protein synthesis machineries of the cell. They may exist in different functional states in the cell. Therefore, it is essential to have structural information on these different functional states of ribosomes to understand their mechanism of action ...

    Ribosomes are the dynamic protein synthesis machineries of the cell. They may exist in different functional states in the cell. Therefore, it is essential to have structural information on these different functional states of ribosomes to understand their mechanism of action. Here, we present single particle cryo-EM reconstructions of the Mycobacterium smegmatis 70S ribosomes in the hibernating state (with HPF), trans-translating state (with tmRNA), and the P/P state (with P-tRNA) resolved to 4.1, 12.5, and 3.4 Å, respectively. A comparison of the P/P state with the hibernating state provides possible functional insights about the Mycobacteria-specific helix H54a rRNA segment. Interestingly, densities for all the four OB domains of bS1 protein is visible in the hibernating 70S ribosome displaying the molecular details of bS1-70S interactions. Our structural data shows a Mycobacteria-specific H54a-bS1 interaction which seems to prevent subunit dissociation and degradation during hibernation without the formation of 100S dimer. This indicates a new role of bS1 protein in 70S protection during hibernation in Mycobacteria in addition to its conserved function during translation initiation.


    Organizational Affiliation

    NTU Institute of Structural Biology, Nanyang Technological University, Singapore, Singapore. sbhushan@ntu.edu.sg.



Macromolecules

Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
SsrA-binding proteinC161Mycolicibacterium smegmatis MC2 155Mutation(s): 0 
Gene Names: smpBMSMEG_2091MSMEI_2045
Find proteins for A0QU63 (Mycolicibacterium smegmatis (strain ATCC 700084 / mc(2)155))
Explore A0QU63 
Go to UniProtKB:  A0QU63
Protein Feature View
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  • Reference Sequence
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Entity ID: 1
MoleculeChainsLengthOrganismImage
tmRNAA369Mycolicibacterium smegmatis MC2 155
Find similar nucleic acids by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsLengthOrganismImage
A-tRNAfMetB77Escherichia coli
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 12.5 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Ministry of Education (Singapore)Singapore--

Revision History  (Full details and data files)

  • Version 1.0: 2018-09-26
    Type: Initial release
  • Version 1.1: 2020-06-03
    Changes: Source and taxonomy, Structure summary