Increased antibiotic resistance of methicillin-resistant staphylococcus aureus USA300 Δpsm mutants and a complementation study of Δpsm mutants using synthetic phenol-soluble modulins

Hun Suk Song, Shashi Kant Bhatia, Tae Rim Choi, Ranjit Gurav, Hyun Joong Kim, Sun Mi Lee, Sol Lee Park, Hye Soo Lee, Hwang Soo Joo, Wooseong Kim, Seung Oh Seo, Yung Hun Yang

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Phenol-soluble modulins (PSMs) are responsible for regulating biofilm formation, persister cell formation, pmtR expression, host cell lysis, and anti-bacterial effects. To determine the effect of psm deletion on methicillin-resistant Staphylococcus aureus, we investigated psm deletion mutants including Δpsmα, Δpsmβ, and Δpsmαβ. These mutants exhibited increased β-lactam antibiotic resistance to ampicillin and oxacillin that was shown to be caused by increased N-acetylmannosamine kinase (nanK) mRNA expression, which regulates persister cell formation, leading to changes in the pattern of phospholipid fatty acids resulting in increased anteiso-C15:0, and increased membrane hydrophobicity with the deletion of PSMs. When synthetic PSMs were applied to Δpsmα and Δpsmβ mutants, treatment of Δpsmα with PSMα1-4 and Δpsmβ with PSMβ1-2 restored the sensitivity to oxacillin and slightly reduced the biofilm formation. Addition of a single fragment showed that α1, α2, α3, and β2 had an inhibiting effect on biofilms in Δpsmα; however, β1 showed an enhancing effect on biofilms in Δpsmβ. This study demonstrates a possible reason for the increased antibiotic resistance in psm mutants and the effect of PSMs on biofilm formation.

Original languageEnglish
Pages (from-to)115-122
Number of pages8
JournalJournal of Microbiology and Biotechnology
Volume31
Issue number1
DOIs
StatePublished - 28 Jan 2021

Keywords

  • Biofilm
  • Fatty acid
  • MRSA
  • Persister cell
  • Phenol-soluble modulins
  • β-lactam antibiotic

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