IIUM Repository

In silico genome-scale metabolic modeling and in vitro static time-kill studies of exogenous metabolites alone and with polymyxin B against Klebsiella pneumoniae

Yean Chung, Wan and Abdul Rahim, Nusaibah and Mahamad Maifiah, Mohd Hafidz and Hawala Shivashekaregowda, Naveen Kumar and Zhu, Yan and Wong, Eng Hwa (2022) In silico genome-scale metabolic modeling and in vitro static time-kill studies of exogenous metabolites alone and with polymyxin B against Klebsiella pneumoniae. Frontiers in Pharmacology. pp. 1-10. ISSN 1663-9812

[img] PDF (Article) - Published Version
Restricted to Repository staff only

Download (1MB) | Request a copy


Multidrug-resistant (MDR) Klebsiella pneumoniae is a top-prioritized Gram-negative pathogen with a high incidence in hospital-acquired infections. Polymyxins have resurged as a last-line therapy to combat Gram-negative “superbugs”, including MDR K. pneumoniae. However, the emergence of polymyxin resistance has increasingly been reported over the past decades when used as monotherapy, and thus combination therapy with non-antibiotics (e.g., metabolites) becomes a promising approach owing to the lower risk of resistance development. Genome-scale metabolic models (GSMMs) were constructed to delineate the altered metabolism of New Delhi metallo-β-lactamase- or extended spectrum β-lactamase-producing K. pneumoniae strains upon addition of exogenous metabolites in media. The metabolites that caused significant metabolic perturbations were then selected to examine their adjuvant effects using in vitro static time–kill studies. Metabolic network simulation shows that feeding of 3-phosphoglycerate and ribose 5-phosphate would lead to enhanced central carbon metabolism, ATP demand, and energy consumption, which is converged with metabolic disruptions by polymyxin treatment. Further static time–kill studies demonstrated enhanced antimicrobial killing of 10 mM 3-phosphoglycerate (1.26 and 1.82 log10 CFU/ml) and 10 mM ribose 5-phosphate (0.53 and 0.91 log10 CFU/ml) combination with 2 mg/L polymyxin B against K. pneumoniae strains. Overall, exogenous metabolite feeding could possibly improve polymyxin B activity via metabolic modulation and hence offers an attractive approach to enhance polymyxin B efficacy. With the application of GSMM in bridging the metabolic analysis and time–kill assay, biological insights into metabolite feeding can be inferred from comparative analyses of both results. Taken together, a systematic framework has been developed to facilitate the clinical translation of antibiotic-resistant infection management.

Item Type: Article (Journal)
Uncontrolled Keywords: Klebsiella pneumoniae, polymyxin, metabolite, genome-scale metabolic modeling, time–kill, metabolic modulation, antimicrobial resistance
Subjects: Q Science > QR Microbiology
R Medicine > RM Therapeutics. Pharmacology > RM300 Drugs and their action
R Medicine > RS Pharmacy and materia medica > RS403 Materia Medica-Pharmaceutical Chemistry
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button): International Institute for Halal Research and Training (INHART)
Depositing User: Dr Mohd Hafidz Mahamad Maifiah
Date Deposited: 05 Aug 2022 08:45
Last Modified: 05 Aug 2022 08:48
URI: http://irep.iium.edu.my/id/eprint/99214

Actions (login required)

View Item View Item


Downloads per month over past year