3GEE

Crystal structure of MnmE from Chlorobium tepidum in complex with GDP and FOLINIC ACID

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.95 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.232 
  • R-Value Observed: 0.234 

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This is version 1.1 of the entry. See complete history. 


Literature

Kissing G domains of MnmE monitored by X-ray crystallography and pulse electron paramagnetic resonance spectroscopy

Meyer, S., Bohme, S., Kruger, A., Steinhoff, H.-J., Klare, J.P., Wittinghofer, A.

(2009) PLoS Biol 7: e1000212-e1000212

  • DOI: 10.1371/journal.pbio.1000212
  • Primary Citation of Related Structures:  
    3GEI, 3GEE, 3GEH

  • PubMed Abstract: 

    • MnmE, which is involved in the modification of the wobble position of certain tRNAs, belongs to the expanding class of G proteins activated by nucleotide-dependent dimerization (GADs). Previous models suggested the protein to be a multidomain protein ...

    MnmE, which is involved in the modification of the wobble position of certain tRNAs, belongs to the expanding class of G proteins activated by nucleotide-dependent dimerization (GADs). Previous models suggested the protein to be a multidomain protein whose G domains contact each other in a nucleotide dependent manner. Here we employ a combined approach of X-ray crystallography and pulse electron paramagnetic resonance (EPR) spectroscopy to show that large domain movements are coupled to the G protein cycle of MnmE. The X-ray structures show MnmE to be a constitutive homodimer where the highly mobile G domains face each other in various orientations but are not in close contact as suggested by the GDP-AlF(x) structure of the isolated domains. Distance measurements by pulse double electron-electron resonance (DEER) spectroscopy show that the G domains adopt an open conformation in the nucleotide free/GDP-bound and an open/closed two-state equilibrium in the GTP-bound state, with maximal distance variations of 18 A. With GDP and AlF(x), which mimic the transition state of the phosphoryl transfer reaction, only the closed conformation is observed. Dimerization of the active sites with GDP-AlF(x) requires the presence of specific monovalent cations, thus reflecting the requirements for the GTPase reaction of MnmE. Our results directly demonstrate the nature of the conformational changes MnmE was previously suggested to undergo during its GTPase cycle. They show the nucleotide-dependent dynamic movements of the G domains around two swivel positions relative to the rest of the protein, and they are of crucial importance for understanding the mechanistic principles of this GAD.

    Organizational Affiliation: 

    Department of Structural Biology, Max-Planck-Institute of Molecular Physiology, Dortmund, Germany.



Macromolecules
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
tRNA modification GTPase mnmEA476Chlorobaculum tepidumMutation(s): 0 
Gene Names: mnmE, CT2084, thdF, trmE
EC: 3.6
Find proteins for Q8KAS1 (Chlorobaculum tepidum (strain ATCC 49652 / DSM 12025 / NBRC 103806 / TLS))
Explore Q8KAS1 
Go to UniProtKB:  Q8KAS1
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FON
Query on FON
Download Ideal Coordinates CCD File 
A
N-{[4-({[(6R)-2-amino-5-formyl-4-oxo-1,4,5,6,7,8-hexahydropteridin-6-yl]methyl}amino)phenyl]carbonyl}-L-glutamic acid
C20 H23 N7 O7
VVIAGPKUTFNRDU-OLZOCXBDSA-N		 Ligand Interaction
GDP
Query on GDP
Download Ideal Coordinates CCD File 
A
GUANOSINE-5'-DIPHOSPHATE
C10 H15 N5 O11 P2
QGWNDRXFNXRZMB-UUOKFMHZSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.95 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.232 
  • R-Value Observed: 0.234 
  • Space Group: I 41 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 130.804α = 90
b = 130.804β = 90
c = 200.611γ = 90
Software Package:
Software NamePurpose
MOLREPphasing
REFMACrefinement
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-10-27
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance