3IZZ

Models for ribosome components that are nearest neighbors to the bovine mitochondrial initiation factor2 bound to the E. Coli ribosome


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 10.8 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Insertion domain within mammalian mitochondrial translation initiation factor 2 serves the role of eubacterial initiation factor 1.

Yassin, A.S.Haque, M.E.Datta, P.P.Elmore, K.Banavali, N.K.Spremulli, L.L.Agrawal, R.K.

(2011) Proc Natl Acad Sci U S A 108: 3918-3923

  • DOI: 10.1073/pnas.1017425108
  • Primary Citation of Related Structures:  
    3IZY, 3IZZ

  • PubMed Abstract: 
  • Mitochondria have their own translational machineries for the synthesis of thirteen polypeptide chains that are components of the complexes that participate in the process of oxidative phosphorylation (or ATP generation). Translation initiation in ma ...

    Mitochondria have their own translational machineries for the synthesis of thirteen polypeptide chains that are components of the complexes that participate in the process of oxidative phosphorylation (or ATP generation). Translation initiation in mammalian mitochondria requires two initiation factors, IF2(mt) and IF3(mt), instead of the three that are present in eubacteria. The mammalian IF2(mt) possesses a unique 37 amino acid insertion domain, which is known to be important for the formation of the translation initiation complex. We have obtained a three-dimensional cryoelectron microscopic map of the mammalian IF2(mt) in complex with initiator fMet-tRNA(iMet) and the eubacterial ribosome. We find that the 37 amino acid insertion domain interacts with the same binding site on the ribosome that would be occupied by the eubacterial initiation factor IF1, which is absent in mitochondria. Our finding suggests that the insertion domain of IF2(mt) mimics the function of eubacterial IF1, by blocking the ribosomal aminoacyl-tRNA binding site (A site) at the initiation step.


    Organizational Affiliation

    Wadsworth Center, New York State Department of Health, Empire State Plaza, Albany, NY 12201-0509, USA.



Macromolecules

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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
Protein S12 (Small Subunit)F124Escherichia coliMutation(s): 0 
Protein Feature View
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  • Reference Sequence
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Entity ID: 6
MoleculeChainsSequence LengthOrganismDetailsImage
Protein L14 (Large Subunit)G121Escherichia coliMutation(s): 0 
Find proteins for P0ADY3 (Escherichia coli (strain K12))
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Go to UniProtKB:  P0ADY3
Protein Feature View
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  • Reference Sequence
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Entity ID: 1
MoleculeChainsLengthOrganismImage
Helix 5, 14, 15 (Small Subunit)A59Escherichia coli
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Entity ID: 2
MoleculeChainsLengthOrganismImage
Helix 18 (Small Subunit)D60Escherichia coli
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Entity ID: 3
MoleculeChainsLengthOrganismImage
Helix 44 (Small Subunit)E100Escherichia coli
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Entity ID: 5
MoleculeChainsLengthOrganismImage
Helix 69, 71, 89, 92, 95 (Large Subunit)B118Escherichia coli
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 10.8 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-03-30
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2018-07-18
    Changes: Data collection