Halting ionic shuttle to disrupt the synthetic machinery-Structural and molecular insights into the inhibitory roles of Bedaquiline towards Mycobacterium tuberculosis ATP synthase in the treatment of tuberculosis.

Autor: Salifu EY; Molecular Bio-computation and Drug Design Laboratory, Discipline of Pharmaceutical Chemistry, University of KwaZulu-Natal, Westville Campus, Durban, South Africa., Agoni C; Molecular Bio-computation and Drug Design Laboratory, Discipline of Pharmaceutical Chemistry, University of KwaZulu-Natal, Westville Campus, Durban, South Africa., Olotu FA; Molecular Bio-computation and Drug Design Laboratory, Discipline of Pharmaceutical Chemistry, University of KwaZulu-Natal, Westville Campus, Durban, South Africa., Dokurugu YM; College of Pharmacy & Pharmaceutical Sciences, Institute of Public Health, Florida Agricultural & Mechanical University, Tallahassee, Florida., Soliman MES; Molecular Bio-computation and Drug Design Laboratory, Discipline of Pharmaceutical Chemistry, University of KwaZulu-Natal, Westville Campus, Durban, South Africa.
Jazyk: angličtina
Zdroj: Journal of cellular biochemistry [J Cell Biochem] 2019 Sep; Vol. 120 (9), pp. 16108-16119. Date of Electronic Publication: 2019 May 24.
DOI: 10.1002/jcb.28891
Abstrakt: Therapeutic targeting of the adenosine triphosphate (ATP) machinery of Mycobacterium tuberculosis (Mtb) has recently presented a potent and alternative measure to halt the pathogenesis of tuberculosis. This has been potentiated by the development of bedaquiline (BDQ), a novel small molecule inhibitor that selectively inhibits mycobacterial F 1 F o -ATP synthase by targeting its rotor c-ring, resulting in the disruption of ATP synthesis and consequential cell death. Although the structural resolution of the mycobacterial C 9 ring in co`mplex with BDQ provided the first-hand detail of BDQ interaction at the c-ring region of the ATP synthase, there still remains a need to obtain essential and dynamic insights into the mechanistic activity of this drug molecule towards crucial survival machinery of Mtb. As such, for the first time, we report an atomistic model to describe the structural dynamics that explicate the experimentally reported antagonistic features of BDQ in halting ion shuttling by the mycobacterial c-ring, using molecular dynamics simulation and the Molecular Mechanics/Poisson-Boltzmann Surface Area methods. Results showed that BDQ exhibited a considerably high ΔG while it specifically maintained high-affinity interactions with Glu65 B and Asp32 B , blocking their crucial roles in proton binding and shuttling, which is required for ATP synthesis. Moreover, the bulky nature of BDQ induced a rigid and compact conformation of the rotor c-ring, which impedes the essential rotatory motion that drives ion exchange and shuttling. In addition, the binding affinity of a BDQ molecule was considerably increased by the complementary binding of another BDQ molecule, which indicates that an increase in BDQ molecule enhances inhibitory potency against Mtb ATP synthase. Taken together, findings provide atomistic perspectives into the inhibitory mechanisms of BDQ coupled with insights that could enhance the structure-based design of novel ATP synthase inhibitors towards the treatment of tuberculosis.
(© 2019 Wiley Periodicals, Inc.)
Databáze: MEDLINE
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