6TJ9

Escherichia coli transketolase in complex with cofactor analog 2'-methoxythiamine and substrate xylulose 5-phosphate

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 0.95 Å
  • R-Value Free: 0.110 
  • R-Value Work: 0.099 
  • R-Value Observed: 0.099 

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Ligand Structure Quality Assessment 


This is version 1.3 of the entry. See complete history. 


Literature

Structural basis for antibiotic action of the B 1 antivitamin 2'-methoxy-thiamine.

Rabe von Pappenheim, F., Aldeghi, M., Shome, B., Begley, T., de Groot, B.L., Tittmann, K.

(2020) Nat Chem Biol 16: 1237-1245

  • DOI: 10.1038/s41589-020-0628-4
  • Primary Citation of Related Structures:  
    6TJ8, 6TJ9

  • PubMed Abstract: 

    • The natural antivitamin 2'-methoxy-thiamine (MTh) is implicated in the suppression of microbial growth. However, its mode of action and enzyme-selective inhibition mechanism have remained elusive. Intriguingly, MTh inhibits some thiamine diphosphate (ThDP) enzymes, while being coenzymatically active in others ...

    The natural antivitamin 2'-methoxy-thiamine (MTh) is implicated in the suppression of microbial growth. However, its mode of action and enzyme-selective inhibition mechanism have remained elusive. Intriguingly, MTh inhibits some thiamine diphosphate (ThDP) enzymes, while being coenzymatically active in others. Here we report the strong inhibition of Escherichia coli transketolase activity by MTh and unravel its mode of action and the structural basis thereof. The unique 2'-methoxy group of MTh diphosphate (MThDP) clashes with a canonical glutamate required for cofactor activation in ThDP-dependent enzymes. This glutamate is forced into a stable, anticatalytic low-barrier hydrogen bond with a neighboring glutamate, disrupting cofactor activation. Molecular dynamics simulations of transketolases and other ThDP enzymes identify active-site flexibility and the topology of the cofactor-binding locale as key determinants for enzyme-selective inhibition. Human enzymes either retain enzymatic activity with MThDP or preferentially bind authentic ThDP over MThDP, while core bacterial metabolic enzymes are inhibited, demonstrating therapeutic potential.

    Organizational Affiliation: 

    Department of Structural Dynamics, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany. ktittma@gwdg.de.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Transketolase 1A, B669Escherichia coli K-12Mutation(s): 0 
Gene Names: tktA, tkt, b2935, JW5478
EC: 2.2.1.1
UniProt
Find proteins for P27302 (Escherichia coli (strain K12))
Explore P27302 
Go to UniProtKB:  P27302
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP27302
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NDQ (Subject of Investigation/LOI)
Query on NDQ
Download Ideal Coordinates CCD File 
D [auth A],
T [auth B]		2-[3-[(4-azanyl-2-methoxy-pyrimidin-5-yl)methyl]-4-methyl-1,3-thiazol-5-yl]ethyl phosphono hydrogen phosphate
C12 H19 N4 O8 P2 S
PWBCVHDHRGCQHM-UHFFFAOYSA-O		 Ligand Interaction
5SP
Query on 5SP
Download Ideal Coordinates CCD File 
C [auth A],
V [auth B]		5-O-phosphono-D-xylulose
C5 H11 O8 P
FNZLKVNUWIIPSJ-RFZPGFLSSA-N		 Ligand Interaction
EDO
Query on EDO
Download Ideal Coordinates CCD File 
AA [auth B],
BA [auth B],
CA [auth B],
DA [auth B],
EA [auth B],
AA [auth B],
BA [auth B],
CA [auth B],
DA [auth B],
EA [auth B],
F [auth A],
FA [auth B],
G [auth A],
GA [auth B],
H [auth A],
HA [auth B],
I [auth A],
IA [auth B],
J [auth A],
K [auth A],
L [auth A],
M [auth A],
N [auth A],
O [auth A],
P [auth A],
Q [auth A],
R [auth A],
W [auth B],
X [auth B],
Y [auth B],
Z [auth B]
1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N		 Ligand Interaction
CA
Query on CA
Download Ideal Coordinates CCD File 
E [auth A],
U [auth B]		CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N		 Ligand Interaction
NA
Query on NA
Download Ideal Coordinates CCD File 
JA [auth B],
S [auth A]		SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 0.95 Å
  • R-Value Free: 0.110 
  • R-Value Work: 0.099 
  • R-Value Observed: 0.099 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 89.76α = 90
b = 102.08β = 90
c = 133.13γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
PDB_EXTRACTdata extraction
XDSdata processing
XSCALEdata scaling
PHENIXphasing
XDSdata reduction

Structure Validation

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Ligand Structure Quality Assessment 


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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
German Research FoundationGermany--

Revision History  (Full details and data files)

  • Version 1.0: 2020-07-08
    Type: Initial release
  • Version 1.1: 2020-09-02
    Changes: Database references, Derived calculations
  • Version 1.2: 2020-09-30
    Changes: Database references
  • Version 1.3: 2020-10-28
    Changes: Database references