5JXQ

TRNA-GUANINE TRANSGLYCOSYLASE (TGT) IN COMPLEX WITH 6-AMINO-2-{[4-(2-HYDROXYETHYL)PHENETHYL]AMINO}-1,7-DIHYDRO-8H-IMIDAZO[4,5-g]QUINAZOLIN-8-ONE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.2 Å
  • R-Value Free: 0.157 
  • R-Value Work: 0.137 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Occupying a flat subpocket in a tRNA-modifying enzyme with ordered or disordered side chains: Favorable or unfavorable for binding?

Neeb, M.Hohn, C.Ehrmann, F.R.Hartsch, A.Heine, A.Diederich, F.Klebe, G.

(2016) Bioorg.Med.Chem. 24: 4900-4910

  • DOI: 10.1016/j.bmc.2016.07.053

  • PubMed Abstract: 
  • Small-molecule ligands binding with partial disorder or enhanced residual mobility are usually assumed as unfavorable with respect to their binding properties. Considering thermodynamics, disorder or residual mobility is entropically favorable and co ...

    Small-molecule ligands binding with partial disorder or enhanced residual mobility are usually assumed as unfavorable with respect to their binding properties. Considering thermodynamics, disorder or residual mobility is entropically favorable and contributes to the Gibbs energy of binding. In the present study, we analyzed a series of congeneric ligands inhibiting the tRNA-modifying enzyme TGT. Attached to the parent lin-benzoguanine scaffold, substituents in position 2 accommodate in a flat solvent-exposed pocket and exhibit varying degree of residual mobility. This is indicated in the crystal structures by enhanced B-factors, reduced occupancies, or distributions over split conformers. MD simulations of the complexes suggest an even larger scatter over several conformational families. Introduction of a terminal acidic group fixes the substituent by a salt-bridge to an Arg residue. Overall, all substituted derivatives show the same affinity underpinning that neither order nor disorder is a determinant factor for binding affinity. The additional salt bridge remains strongly solvent-exposed and thus does not contribute to affinity. MD suggests temporary fluctuation of this contact.


    Organizational Affiliation

    Institut für Pharmazeutische Chemie, Philipps-Universität Marburg, Marbacher Weg 6, 35032 Marburg, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Queuine tRNA-ribosyltransferase
A
386Zymomonas mobilis subsp. mobilis (strain ATCC 31821 / ZM4 / CP4)Mutation(s): 0 
Gene Names: tgt
EC: 2.4.2.29
Find proteins for P28720 (Zymomonas mobilis subsp. mobilis (strain ATCC 31821 / ZM4 / CP4))
Go to UniProtKB:  P28720
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL

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Download CCD File 
A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
GOL
Query on GOL

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Download CCD File 
A
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
6OK
Query on 6OK

Download SDF File 
Download CCD File 
A
6-amino-2-({2-[4-(2-hydroxyethyl)phenyl]ethyl}amino)-1,7-dihydro-8H-imidazo[4,5-g]quinazolin-8-one
C19 H20 N6 O2
RGCYFFRYXJGABS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.2 Å
  • R-Value Free: 0.157 
  • R-Value Work: 0.137 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 90.220α = 90.00
b = 64.760β = 96.16
c = 70.340γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
PHENIXrefinement
PHASERphasing
XSCALEdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2016-08-10
    Type: Initial release
  • Version 1.1: 2016-08-17
    Type: Database references
  • Version 1.2: 2016-10-19
    Type: Database references
  • Version 1.3: 2018-03-07
    Type: Data collection