4BF9

Crystal structure of E. coli dihydrouridine synthase C (DusC) (selenomethionine derivative)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.177 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Major Reorientation of tRNA Substrates Defines Specificity of Dihydrouridine Synthases.

Byrne, R.T.Jenkins, H.T.Peters, D.T.Whelan, F.Stowell, J.Aziz, N.Kasatsky, P.Rodnina, M.V.Koonin, E.V.Konevega, A.L.Antson, A.A.

(2015) Proc.Natl.Acad.Sci.USA 112: 6033

  • DOI: 10.1073/pnas.1500161112
  • Primary Citation of Related Structures:  4BFA, 4YCO, 4YCP

  • PubMed Abstract: 
  • The reduction of specific uridines to dihydrouridine is one of the most common modifications in tRNA. Increased levels of the dihydrouridine modification are associated with cancer. Dihydrouridine synthases (Dus) from different subfamilies selectivel ...

    The reduction of specific uridines to dihydrouridine is one of the most common modifications in tRNA. Increased levels of the dihydrouridine modification are associated with cancer. Dihydrouridine synthases (Dus) from different subfamilies selectively reduce distinct uridines, located at spatially unique positions of folded tRNA, into dihydrouridine. Because the catalytic center of all Dus enzymes is conserved, it is unclear how the same protein fold can be reprogrammed to ensure that nucleotides exposed at spatially distinct faces of tRNA can be accommodated in the same active site. We show that the Escherichia coli DusC is specific toward U16 of tRNA. Unexpectedly, crystal structures of DusC complexes with tRNA(Phe) and tRNA(Trp) show that Dus subfamilies that selectively modify U16 or U20 in tRNA adopt identical folds but bind their respective tRNA substrates in an almost reverse orientation that differs by a 160° rotation. The tRNA docking orientation appears to be guided by subfamily-specific clusters of amino acids ("binding signatures") together with differences in the shape of the positively charged tRNA-binding surfaces. tRNA orientations are further constrained by positional differences between the C-terminal "recognition" domains. The exquisite substrate specificity of Dus enzymes is therefore controlled by a relatively simple mechanism involving major reorientation of the whole tRNA molecule. Such reprogramming of the enzymatic specificity appears to be a unique evolutionary solution for altering tRNA recognition by the same protein fold.


    Organizational Affiliation

    York Structural Biology Laboratory, Department of Chemistry, and.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TRNA-DIHYDROURIDINE SYNTHASE C
A
338Escherichia coli (strain K12)Gene Names: dusC (yohI)
EC: 1.3.1.-
Find proteins for P33371 (Escherichia coli (strain K12))
Go to UniProtKB:  P33371
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FMN
Query on FMN

Download SDF File 
Download CCD File 
A
FLAVIN MONONUCLEOTIDE
RIBOFLAVIN MONOPHOSPHATE
C17 H21 N4 O9 P
FVTCRASFADXXNN-SCRDCRAPSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.177 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 94.140α = 90.00
b = 94.140β = 90.00
c = 119.680γ = 90.00
Software Package:
Software NamePurpose
BUCCANEERphasing
PARROTphasing
REFMACrefinement
SCALAdata scaling
PHASERphasing
SHELXCDphasing
BUCCANEERmodel building

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-11-06
    Type: Initial release
  • Version 1.1: 2015-04-22
    Type: Database references
  • Version 1.2: 2015-05-13
    Type: Database references
  • Version 1.3: 2015-05-27
    Type: Database references