7MYG

M. tb Ag85C modified by THL-10d


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.51 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.155 
  • R-Value Observed: 0.162 

wwPDB Validation   3D Report Full Report


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Literature

Total Synthesis of Tetrahydrolipstatin, Its Derivatives, and Evaluation of Their Ability to Potentiate Multiple Antibiotic Classes against Mycobacterium Species.

Khan, S.S.Sudasinghe, T.D.Landgraf, A.D.Ronning, D.R.Sucheck, S.J.

(2021) ACS Infect Dis 

  • DOI: 10.1021/acsinfecdis.1c00283
  • Primary Citation of Related Structures:  
    7MYG

  • PubMed Abstract: 
  • Tetrahydrolipstatin (THL, 1a ) has been shown to inhibit both mammalian and bacterial α/β hydrolases. In the case of bacterial systems, THL is a known inhibitor of several Mycobacterium tuberculosis hydrolases involved in mycomembrane biosynthesis ...

    Tetrahydrolipstatin (THL, 1a ) has been shown to inhibit both mammalian and bacterial α/β hydrolases. In the case of bacterial systems, THL is a known inhibitor of several Mycobacterium tuberculosis hydrolases involved in mycomembrane biosynthesis. Herein we report a highly efficient eight-step asymmetric synthesis of THL using a route that allows modification of the THL α-chain substituent to afford compounds 1a through 1e . The key transformation in the synthesis was use of a (TPP)CrCl/Co 2 (CO) 8 -catalyzed regioselective and stereospecific carbonylation on an advanced epoxide intermediate to yield a trans -β-lactone. These compounds are modest inhibitors of Ag85A and Ag85C, two α/β hydrolases of M. tuberculosis involved in the biosynthesis of the mycomembrane. Among these compounds, 10d showed the highest inhibitory effect on Ag85A (34 ± 22 μM) and Ag85C (66 ± 8 μM), and its X-ray structure was solved in complex with Ag85C to 2.5 Å resolution. In contrast, compound 1e exhibited the best-in-class MICs of 50 μM (25 μg/mL) and 16 μM (8.4 μg/mL) against M . smegmatis and M. tuberculosis H37Ra, respectively, using a microtiter assay plate. Combination of 1e with 13 well-established antibiotics synergistically enhanced the potency of few of these antibiotics in M . smegmatis and M. tuberculosis H37Ra. Compound 1e applied at concentrations 4-fold lower than its MIC enhanced the MIC of the synergistic antibiotic by 2-256-fold. In addition to observing synergy with first-line drugs, rifamycin and isoniazid, the MIC of vancomycin against M. tuberculosis H37Ra was 65 μg/mL; however, the MIC was lowered to 0.25 μg/mL in the presence of 2.1 μg/mL 1e demonstrating the potential of targeting mycobacterial hydrolases involved in mycomembrane and peptidoglycan biosynthesis.


    Organizational Affiliation

    Department of Chemistry & Biochemistry, University of Toledo, Toledo, Ohio 43606, United States.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Diacylglycerol acyltransferaseA, B278Mycobacterium tuberculosisMutation(s): 0 
Gene Names: 
EC: 2.3.1
UniProt
Find proteins for A0A045JX50 (Mycobacterium tuberculosis)
Explore A0A045JX50 
Go to UniProtKB:  A0A045JX50
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.51 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.155 
  • R-Value Observed: 0.162 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 59.458α = 90
b = 70.606β = 89.97
c = 68.59γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
PDB_EXTRACTdata extraction
MOSFLMdata reduction
SCALAdata scaling
PHENIXphasing

Structure Validation

View Full Validation Report




Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesR01AI105084

Revision History  (Full details and data files)

  • Version 1.0: 2021-09-15
    Type: Initial release