3J8G

Electron cryo-microscopy structure of EngA bound with the 50S ribosomal subunit


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 5.00 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Starting Models: experimental
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This is version 1.2 of the entry. See complete history


Literature

Structural insights into the function of a unique tandem GTPase EngA in bacterial ribosome assembly

Zhang, X.Yan, K.Zhang, Y.Li, N.Ma, C.Li, Z.Zhang, Y.Feng, B.Liu, J.Sun, Y.Xu, Y.Lei, J.Gao, N.

(2014) Nucleic Acids Res 

  • DOI: https://doi.org/10.1093/nar/gku1135
  • Primary Citation of Related Structures:  
    3J8G

  • PubMed Abstract: 

    Many ribosome-interacting GTPases, with proposed functions in ribosome biogenesis, are also implicated in the cellular regulatory coupling between ribosome assembly process and various growth control pathways. EngA is an essential GTPase in bacteria, and intriguingly, it contains two consecutive GTPase domains (GD), being one-of-a-kind among all known GTPases. EngA is required for the 50S subunit maturation. However, its molecular role remains elusive. Here, we present the structure of EngA bound to the 50S subunit. Our data show that EngA binds to the peptidyl transferase center (PTC) and induces dramatic conformational changes on the 50S subunit, which virtually returns the 50S subunit to a state similar to that of the late-stage 50S assembly intermediates. Very interestingly, our data show that the two GDs exhibit a pseudo-two-fold symmetry in the 50S-bound conformation. Our results indicate that EngA recognizes certain forms of the 50S assembly intermediates, and likely facilitates the conformational maturation of the PTC of the 23S rRNA in a direct manner. Furthermore, in a broad context, our data also suggest that EngA might be a sensor of the cellular GTP/GDP ratio, endowed with multiple conformational states, in response to fluctuations in cellular nucleotide pool, to facilitate and regulate ribosome assembly.


  • Organizational Affiliation

    Ministry of Education Key Laboratory of Protein Sciences, Center for Structural Biology, School of Life Sciences, Tsinghua University, Beijing 100084, China.


Macromolecules

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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
50S ribosomal protein L28C [auth 0]78Escherichia coli K-12Mutation(s): 0 
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
50S ribosomal protein L14D [auth K]123Escherichia coli K-12Mutation(s): 0 
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
50S ribosomal protein L15E [auth L]144Escherichia coli K-12Mutation(s): 0 
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Entity ID: 6
MoleculeChains Sequence LengthOrganismDetailsImage
50S ribosomal protein L29F [auth 1]63Escherichia coli K-12Mutation(s): 0 
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Entity ID: 7
MoleculeChains Sequence LengthOrganismDetailsImage
50S ribosomal protein L16G [auth M]136Escherichia coli K-12Mutation(s): 0 
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Entity ID: 8
MoleculeChains Sequence LengthOrganismDetailsImage
50S ribosomal protein L17H [auth N]127Escherichia coli K-12Mutation(s): 0 
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Entity ID: 9
MoleculeChains Sequence LengthOrganismDetailsImage
50S ribosomal protein L18I [auth O]117Escherichia coli K-12Mutation(s): 0 
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Entity ID: 10
MoleculeChains Sequence LengthOrganismDetailsImage
50S ribosomal protein L19J [auth P]115Escherichia coli K-12Mutation(s): 0 
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Entity ID: 11
MoleculeChains Sequence LengthOrganismDetailsImage
50S ribosomal protein L20K [auth Q]118Escherichia coli K-12Mutation(s): 0 
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Entity ID: 12
MoleculeChains Sequence LengthOrganismDetailsImage
50S ribosomal protein L21L [auth R]103Escherichia coli K-12Mutation(s): 0 
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Entity ID: 13
MoleculeChains Sequence LengthOrganismDetailsImage
50S ribosomal protein L22M [auth S]110Escherichia coli K-12Mutation(s): 0 
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Entity ID: 14
MoleculeChains Sequence LengthOrganismDetailsImage
50S ribosomal protein L3N [auth D]209Escherichia coli K-12Mutation(s): 0 
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Entity ID: 15
MoleculeChains Sequence LengthOrganismDetailsImage
50S ribosomal protein L23O [auth T]100Escherichia coli K-12Mutation(s): 0 
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Entity ID: 16
MoleculeChains Sequence LengthOrganismDetailsImage
50S ribosomal protein L30P [auth 2]59Escherichia coli K-12Mutation(s): 0 
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Entity ID: 17
MoleculeChains Sequence LengthOrganismDetailsImage
50S ribosomal protein L24Q [auth U]104Escherichia coli K-12Mutation(s): 0 
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Entity ID: 18
MoleculeChains Sequence LengthOrganismDetailsImage
50S ribosomal protein L25R [auth W]94Escherichia coli K-12Mutation(s): 0 
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Entity ID: 19
MoleculeChains Sequence LengthOrganismDetailsImage
GTPase DerS [auth X]490Escherichia coli K-12Mutation(s): 0 
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Entity ID: 20
MoleculeChains Sequence LengthOrganismDetailsImage
50S ribosomal protein L4T [auth E]201Escherichia coli K-12Mutation(s): 0 
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Entity ID: 21
MoleculeChains Sequence LengthOrganismDetailsImage
50S ribosomal protein L27U [auth Y]85Escherichia coli K-12Mutation(s): 0 
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Entity ID: 22
MoleculeChains Sequence LengthOrganismDetailsImage
50S ribosomal protein L32V [auth 3]57Escherichia coli K-12Mutation(s): 0 
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Entity ID: 23
MoleculeChains Sequence LengthOrganismDetailsImage
50S ribosomal protein L1W [auth 5]234Escherichia coli K-12Mutation(s): 0 
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Entity ID: 24
MoleculeChains Sequence LengthOrganismDetailsImage
50S ribosomal protein L34X [auth 6]46Escherichia coli K-12Mutation(s): 0 
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Entity ID: 25
MoleculeChains Sequence LengthOrganismDetailsImage
50S ribosomal protein L35Y [auth 7]65Escherichia coli K-12Mutation(s): 0 
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Entity ID: 26
MoleculeChains Sequence LengthOrganismDetailsImage
50S ribosomal protein L36Z [auth 8]38Escherichia coli K-12Mutation(s): 0 
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Entity ID: 27
MoleculeChains Sequence LengthOrganismDetailsImage
50S ribosomal protein L2AA [auth C]273Escherichia coli K-12Mutation(s): 0 
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Entity ID: 28
MoleculeChains Sequence LengthOrganismDetailsImage
50S ribosomal protein L5BA [auth F]179Escherichia coli K-12Mutation(s): 0 
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Entity ID: 29
MoleculeChains Sequence LengthOrganismDetailsImage
50S ribosomal protein L6CA [auth G]177Escherichia coli K-12Mutation(s): 0 
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Entity ID: 30
MoleculeChains Sequence LengthOrganismDetailsImage
50S ribosomal protein L9DA [auth H]149Escherichia coli K-12Mutation(s): 0 
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Entity ID: 31
MoleculeChains Sequence LengthOrganismDetailsImage
50S ribosomal protein L11EA [auth I]142Escherichia coli K-12Mutation(s): 0 
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MoleculeChains Sequence LengthOrganismDetailsImage
50S ribosomal protein L13FA [auth J]142Escherichia coli K-12Mutation(s): 0 
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Entity ID: 1
MoleculeChains LengthOrganismImage
5S rRNA117Escherichia coli K-12
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Entity ID: 2
MoleculeChains LengthOrganismImage
23S rRNA2,903Escherichia coli K-12
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 5.00 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONRELION

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-11-26
    Type: Initial release
  • Version 1.1: 2019-12-18
    Changes: Data collection, Database references, Structure summary
  • Version 1.2: 2024-03-20
    Changes: Data collection, Database references, Refinement description