7M7V image
Entry Detail
PDB ID:
7M7V
Title:
Crystal Structure of Mtb Pks13 Thioesterase domain in complex with Compound 6
Biological Source:
PDB Version:
Deposition Date:
2021-03-29
Release Date:
2022-02-16
Method Details:
Experimental Method:
Resolution:
2.29 Å
R-Value Free:
0.26
R-Value Work:
0.22
R-Value Observed:
0.22
Space Group:
P 21 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Polyketide synthase Pks13
Chain IDs:A, B
Chain Length:286
Number of Molecules:2
Biological Source:Mycobacterium tuberculosis
Ligand Molecules
Primary Citation

Abstact

With increasing drug resistance in tuberculosis (TB) patient populations, there is an urgent need for new drugs. Ideally, new agents should work through novel targets so that they are unencumbered by preexisting clinical resistance to current treatments. Benzofuran 1 was identified as a potential lead for TB inhibiting a novel target, the thioesterase domain of Pks13. Although, having promising activity against Mycobacterium tuberculosis, its main liability was inhibition of the hERG cardiac ion channel. This article describes the optimization of the series toward a preclinical candidate. Despite improvements in the hERG liability in vitro, when new compounds were assessed in ex vivo cardiotoxicity models, they still induced cardiac irregularities. Further series development was stopped because of concerns around an insufficient safety window. However, the demonstration of in vivo activity for multiple series members further validates Pks13 as an attractive novel target for antitubercular drugs and supports development of alternative chemotypes.

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Disease

Primary Citation of related structures