3CRM

Structure of tRNA Dimethylallyltransferase: RNA Modification through a Channel


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.211 

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Literature

Structure of tRNA Dimethylallyltransferase: RNA Modification through a Channel

Xie, W.Zhou, C.Huang, R.H.

(2007) J Mol Biol 367: 872-881

  • DOI: 10.1016/j.jmb.2007.01.048
  • Primary Citation of Related Structures:  
    3CRR, 3CRM, 3CRQ

  • PubMed Abstract: 
  • Dimethylallyltransferase (DMATase) transfers a five-carbon isoprenoid moiety from dimethylallyl pyrophosphate (DMAPP) to the amino group of adenosine at position 37 of certain tRNAs. Reported here are the crystal structures of Pseudomonas aeruginosa DMATase alone and in complex with pyrophosphate at 1 ...

    Dimethylallyltransferase (DMATase) transfers a five-carbon isoprenoid moiety from dimethylallyl pyrophosphate (DMAPP) to the amino group of adenosine at position 37 of certain tRNAs. Reported here are the crystal structures of Pseudomonas aeruginosa DMATase alone and in complex with pyrophosphate at 1.9 A resolution. Surprisingly, the enzyme possesses a central channel spanning the entire width of the enzyme. Both the accepting substrate tRNA and the donating substrate DMAPP appear to enter the channel from opposite sides in an ordered sequence, with tRNA first and DMAPP second, and the RNA modification reaction occurs in the middle of the channel once the two substrates have met. The structure of DMATase is homologous to a class of small soluble kinases involved in biosynthesis of nucleotide precursors for nucleic acids, indicating its possibly evolutionary origin. Furthermore, specific recognition of the pyrophosphate by a conserved loop in DMATase, similar to the P-loop commonly seen in diverse nucleotide-binding proteins, demonstrates that DMATase is structurally and mechanistically distinct from farnesyltransferase, another family of prenyltransferases involved in protein modification.


    Organizational Affiliation

    Department of Biochemistry, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
tRNA delta(2)-isopentenylpyrophosphate transferaseA323Pseudomonas aeruginosaMutation(s): 0 
Gene Names: miaA
EC: 2.5.1.8 (PDB Primary Data), 2.5.1.75 (UniProt)
UniProt
Find proteins for Q9HUL9 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore Q9HUL9 
Go to UniProtKB:  Q9HUL9
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.211 
  • Space Group: P 41
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 76.083α = 90
b = 76.083β = 90
c = 58.302γ = 90
Software Package:
Software NamePurpose
CNSrefinement
PDB_EXTRACTdata extraction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-04-29
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance