A study of Rose Bengal against a 2-keto-3-deoxy-d-manno-octulosonate cytidylyltransferase as an antibiotic candidate

Suwon Kim, Seri Jo, Mi Sun Kim, Dong Hae Shin

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Frequent occurrences of multi-drug resistance of pathogenic Gram-negative bacteria threaten human beings. The CMP-2-keto-3-deoxy-d-manno-octulosonic acid biosynthesis pathway is one of the new targets for antibiotic design. 2-Keto-3-deoxy-d-manno-octulosonate cytidylyltransferase (KdsB) is the key enzyme in this pathway. KdsB proteins from Burkholderia pseudomallei (Bp), B. thailandensis (Bt), Pseudomonas aeruginosa (Pa), and Chlamydia psittaci (Cp) have been assayed to find inhibitors. Interestingly, Rose Bengal (4,5,6,7-tetrachloro-2′,4′,5′,7′-tetraiodofluorescein) was turned out to be an inhibitor of three KdsBs (BpKdsB, BtKdsB, and PaKdsB) with promising IC50 values and increased thermostability. The inhibitory enzyme kinetics of Rose Bengal revealed that it is competitive with 2-keto-3-deoxy-manno-octulosonic acid (KDO) but non-competitive against cytidine 5′-triphosphate (CTP). Induced-fit docking analysis of PaKdsB revealed that Arg160 and Arg185 together with other interactions in the substrate binding site seemed to play an important role in binding with Rose Bengal. We suggest that Rose Bengal can be used as the scaffold to develop potential antibiotics.

Original languageEnglish
Pages (from-to)1414-1421
Number of pages8
JournalJournal of Enzyme Inhibition and Medicinal Chemistry
Volume35
Issue number1
DOIs
StatePublished - 1 Jan 2020

Keywords

  • 2-keto-3-deoxy-d-manno-octulosonate cytidylyltransferase (KdsB)
  • CMP-2-keto-3-deoxy-d-manno-octulosonic acid biosynthesis pathway
  • melioidosis
  • multi-drug resistance
  • Rose Bengal

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