2ZXU

Crystal structure of tRNA modification enzyme MiaA in the complex with tRNA(Phe) and DMASPP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.75 Å
  • R-Value Free: 0.281 
  • R-Value Work: 0.237 

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This is version 2.0 of the entry. See complete history


Literature

Snapshots of dynamics in synthesizing N(6)-isopentenyladenosine at the tRNA anticodon

Chimnaronk, S.Forouhar, F.Sakai, J.Yao, M.Tron, C.M.Atta, M.Fontecave, M.Hunt, J.F.Tanaka, I.

(2009) Biochemistry 48: 5057-5065

  • DOI: 10.1021/bi900337d
  • Primary Citation of Related Structures:  
    2ZM5, 2ZXU

  • PubMed Abstract: 
  • Bacterial and eukaryotic tRNAs that decode codons starting with uridine have a hydrophobically hypermodified adenosine at position 37 (A(37)) adjacent to the 3'-end of the anticodon, which is essential for efficient and highly accurate protein translation by the ribosome ...

    Bacterial and eukaryotic tRNAs that decode codons starting with uridine have a hydrophobically hypermodified adenosine at position 37 (A(37)) adjacent to the 3'-end of the anticodon, which is essential for efficient and highly accurate protein translation by the ribosome. However, it remains unclear as to how the corresponding tRNAs are selected to be modified by alkylation at the correct position of the adenosine base. We have determined a series of crystal structures of bacterial tRNA isopentenyltransferase (MiaA) in apo- and tRNA-bound forms, which completely render snapshots of substrate selections during the modification of RNA. A compact evolutionary inserted domain (herein swinging domain) in MiaA that exhibits as a highly mobile entity moves around the catalytic domain as likely to reach and trap the tRNA substrate. Thereby, MiaA clamps the anticodon stem loop of the tRNA substrate between the catalytic and swinging domains, where the two conserved elongated residues from the swinging domain pinch the two flanking A(36) and A(38) together to squeeze out A(37) into the reaction tunnel. The site-specific isopentenylation of RNA is thus ensured by a characteristic pinch-and-flip mechanism and by a reaction tunnel to confine the substrate selection. Furthermore, combining information from soaking experiments with structural comparisons, we propose a mechanism for the ordered substrate binding of MiaA.


    Organizational Affiliation

    Faculty of Advanced Life Sciences, Hokkaido University, Kita-ku, Sapporo 060-0810, Japan.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
tRNA delta(2)-isopentenylpyrophosphate transferaseA, B316Escherichia coli K-12Mutation(s): 0 
Gene Names: minaAmiaAtrpXb4171JW4129
EC: 2.5.1.8 (PDB Primary Data), 2.5.1.75 (UniProt)
UniProt
Find proteins for P16384 (Escherichia coli (strain K12))
Explore P16384 
Go to UniProtKB:  P16384
Protein Feature View
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  • Reference Sequence
Find similar nucleic acids by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsLengthOrganismImage
tRNA(Phe)C, D76Escherichia coli K-12
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.75 Å
  • R-Value Free: 0.281 
  • R-Value Work: 0.237 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 88.3α = 90
b = 90β = 90
c = 150.5γ = 90
Software Package:
Software NamePurpose
LAFIREmodel building
CNSrefinement
HKL-2000data reduction
HKL-2000data scaling
LAFIREphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-05-26
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 2.0: 2019-10-16
    Changes: Data collection, Non-polymer description, Structure summary