6D4Q image
Entry Detail
PDB ID:
6D4Q
Title:
M. thermoresistible GuaB2 delta-CBS in complex with inhibitor Compound 14 (VCC900455)
Biological Source:
PDB Version:
Deposition Date:
2018-04-18
Release Date:
2019-05-01
Method Details:
Experimental Method:
Resolution:
1.71 Å
R-Value Free:
0.18
R-Value Work:
0.16
R-Value Observed:
0.16
Space Group:
I 4
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Inosine-5'-monophosphate dehydrogenase,Inosine-5'-monophosphate dehydrogenase
Chain IDs:A
Chain Length:389
Number of Molecules:1
Biological Source:Mycobacterium thermoresistibile (strain ATCC 19527 / DSM 44167 / CIP 105390 / JCM 6362 / NCTC 10409 / 316)
Primary Citation
Synthesis and Structure-Activity relationship of 1-(5-isoquinolinesulfonyl)piperazine analogues as inhibitors of Mycobacterium tuberculosis IMPDH.
Eur.J.Med.Chem. 174 309 329 (2019)
PMID: 31055147 DOI: 10.1016/j.ejmech.2019.04.027

Abstact

Tuberculosis (TB) is a major infectious disease associated increasingly with drug resistance. Thus, new anti-tubercular agents with novel mechanisms of action are urgently required for the treatment of drug-resistant TB. In prior work, we identified compound 1 (cyclohexyl(4-(isoquinolin-5-ylsulfonyl)piperazin-1-yl)methanone) and showed that its anti-tubercular activity is attributable to inhibition of inosine-5'-monophosphate dehydrogenase (IMPDH) in Mycobacterium tuberculosis. In the present study, we explored the structure-activity relationship around compound 1 by synthesizing and evaluating the inhibitory activity of analogues against M. tuberculosis IMPDH in biochemical and whole-cell assays. X-ray crystallography was performed to elucidate the mode of binding of selected analogues to IMPDH. We establish the importance of the cyclohexyl, piperazine and isoquinoline rings for activity, and report the identification of an analogue with IMPDH-selective activity against a mutant of M. tuberculosis that is highly resistant to compound 1. We also show that the nitrogen in urea analogues is required for anti-tubercular activity and identify benzylurea derivatives as promising inhibitors that warrant further investigation.

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