1ZO1

IF2, IF1, and tRNA fitted to cryo-EM data OF E. COLI 70S initiation complex


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 13.8 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

The Cryo-EM Structure of a Translation Initiation Complex from Escherichia coli.

Allen, G.S.Zavialov, A.Gursky, R.Ehrenberg, M.Frank, J.

(2005) Cell 121: 703-712

  • DOI: 10.1016/j.cell.2005.03.023
  • Primary Citation of Related Structures:  
    1ZO1, 1ZO3

  • PubMed Abstract: 
  • The 70S ribosome and its complement of factors required for initiation of translation in E. coli were purified separately and reassembled in vitro with GDPNP, producing a stable initiation complex (IC) stalled after 70S assembly. We have obtained a cryo-EM reconstruction of the IC showing IF2*GDPNP at the intersubunit cleft of the 70S ribosome ...

    The 70S ribosome and its complement of factors required for initiation of translation in E. coli were purified separately and reassembled in vitro with GDPNP, producing a stable initiation complex (IC) stalled after 70S assembly. We have obtained a cryo-EM reconstruction of the IC showing IF2*GDPNP at the intersubunit cleft of the 70S ribosome. IF2*GDPNP contacts the 30S and 50S subunits as well as fMet-tRNA(fMet). IF2 here adopts a conformation radically different from that seen in the recent crystal structure of IF2. The C-terminal domain of IF2 binds to the single-stranded portion of fMet-tRNA(fMet), thereby forcing the tRNA into a novel orientation at the P site. The GTP binding domain of IF2 binds to the GTPase-associated center of the 50S subunit in a manner similar to EF-G and EF-Tu. Additionally, we present evidence for the localization of IF1, IF3, one C-terminal domain of L7/L12, and the N-terminal domain of IF2 in the initiation complex.


    Organizational Affiliation

    Howard Hughes Medical Institute, Health Research, Inc. at the Wadsworth Center, Albany, New York 12201, USA.



Macromolecules

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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
translation initiation factor 2B [auth I]501Escherichia coliMutation(s): 0 
UniProt
Find proteins for P0A705 (Escherichia coli (strain K12))
Explore P0A705 
Go to UniProtKB:  P0A705
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0A705
Protein Feature View
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
translation Initiation Factor 1C [auth W]71Escherichia coliMutation(s): 0 
UniProt
Find proteins for P69222 (Escherichia coli (strain K12))
Explore P69222 
Go to UniProtKB:  P69222
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP69222
Protein Feature View
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  • Reference Sequence
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Entity ID: 1
MoleculeChainsLengthOrganismImage
P/I-site tRNAA [auth F]76Escherichia coli
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 13.8 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-06-14
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2019-12-18
    Changes: Data collection, Other