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Recent Advances in Molecular Mechanisms of Bacterial Resistance and Antibiotic Therapy

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Molecular Microbiology".

Deadline for manuscript submissions: 30 July 2025 | Viewed by 447

Special Issue Editor


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Guest Editor
Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
Interests: antimicrobials; pharmacodynamics; molecular mechanisms; medical informatics; pharmacology; bacterial infections; pulmonary fibrosis

Special Issue Information

Dear Colleagues,

Bacterial resistance is a global health emergency, with resistance detected to almost all antibiotics currently in clinical use. Correspondingly, the pursuit of new antibiotic therapy by humans to curb infections caused by antibiotic-resistant bacteria has also never stopped. Understanding the molecular mechanisms by which bacteria resist the action of antibiotics is crucial for recognizing global resistance patterns, improving the use of existing drugs, and developing new strategies to combat resistance. Similarly, revealing the targets or molecular mechanisms of antimicrobials, especially those of new antibacterial molecules different from traditional antibiotics, against bacterial pathogens is necessary for developing new therapeutics, finding new antibacterial action models, and designing or screening new drugs that are less likely to develop resistance.

Areas of interest include, but are not limited to:

  • New horizons in the resistance mechanisms of WHO priority pathogens, ESCAPE pathogens, and other “superbugs”;
  • New clues related to antibiotic resistance, such as enzymatic modification, quorum sensing systems, efflux pumps, changed membrane permeability, regulatory genes or factors, etc., mined from DNA sequencing of clinical strains or laboratory induced-bacteria;
  • New advances in the molecular targets or mechanisms of traditional bacterostatic, or bactericidal agents, such as small molecule compounds, antimicrobial peptides, antimicrobial combinations, hybrid antibiotics, and repurposing drugs, etc.
  • New discoveries and perspectives on non-traditional antibacterial mechanisms of potential medicinal molecules, such as anti-virulence agents, immune modulators, and toxin neutralizers.

Prof. Dr. Xinyi Yang
Guest Editor

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Keywords

  • bacterial resistance
  • antibiotics
  • antimicrobials
  • “superbugs”
  • clinical strains
  • laboratory induced-bacteria
  • antimicrobial peptides
  • antimicrobial combinations
  • hybrid antibiotics
  • repurposing drugs
  • anti-virulence agents
  • immune modulators
  • toxin neutralizers

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Published Papers (2 papers)

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Research

18 pages, 2461 KiB  
Article
D-Serine Can Modify the Wall Teichoic Acid of MRSA via the dlt Pathway
by Lei Wang, Jinru Xie, Qing Wang, Penghe Wang, Xinxin Hu, Tongying Nie, Lei Hou, Xinyi Yang, Xiukun Wang, Xuefu You and Congran Li
Int. J. Mol. Sci. 2025, 26(9), 4110; https://doi.org/10.3390/ijms26094110 - 25 Apr 2025
Viewed by 113
Abstract
Methicillin-resistant Staphylococcus aureus (MRSA) infection is a serious clinical threat, and D-Serine (D-Ser) showed significant sensitization effects on β-lactams against MRSA in our previous study. Quantitative PCR analysis found the elevated expression of the dlt operon with D-Ser combination, which is responsible for [...] Read more.
Methicillin-resistant Staphylococcus aureus (MRSA) infection is a serious clinical threat, and D-Serine (D-Ser) showed significant sensitization effects on β-lactams against MRSA in our previous study. Quantitative PCR analysis found the elevated expression of the dlt operon with D-Ser combination, which is responsible for wall teichoic acid (WTA) modification involving D-Alanine (D-Ala). This study aims to verify the effect of D-Ser on WTA modification through the dlt pathway and explore the related effects on bacteria. The DltA and DltC were recombined, and enzyme kinetic evaluations with different D-amino acids were then conducted; it was found that D-Ser is the second-best substrate for DltA (just after D-Ala), no matter whether DltC is present or not. D-Ser treatment also lowered WTA generation as demonstrated by WTA phosphate quantification and native-PAGE electrophoresis, increased the susceptibility of S. aureus to polymyxins, and elevated the mouse survival rate in the MRSA intraperitoneal infection model without affecting the bacterial loads in the main organs, indicating possible effects of D-Ser on MRSA virulence through WTA modification. In conclusion, the current study provided evidence for D-Ser modification of WTA via the dlt pathway, and its possible involvement in D-Ser sensitization deserves further investigation. Full article
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16 pages, 3057 KiB  
Article
Dual Mutations in MSMEG_0965 and MSMEG_1380 Confer High-Level Resistance to Bortezomib and Linezolid by Both Reducing Drug Intake and Increasing Efflux in Mycobacterium smegmatis
by Han Zhang, Cuiting Fang, Buhari Yusuf, Xiaoqing Zhu, Shuai Wang, H. M. Adnan Hameed, Yamin Gao and Tianyu Zhang
Int. J. Mol. Sci. 2025, 26(8), 3779; https://doi.org/10.3390/ijms26083779 - 17 Apr 2025
Viewed by 204
Abstract
The emergence of multidrug-resistant and extensively drug-resistant Mycobacterium tuberculosis strains poses serious challenges to global tuberculosis control, highlighting the urgent need to elucidate the mechanisms underlying multidrug resistance. In this study, we screened for spontaneous bortezomib (BTZ)-resistant Mycobacterium smegmatis (Msm) mutants and identified [...] Read more.
The emergence of multidrug-resistant and extensively drug-resistant Mycobacterium tuberculosis strains poses serious challenges to global tuberculosis control, highlighting the urgent need to elucidate the mechanisms underlying multidrug resistance. In this study, we screened for spontaneous bortezomib (BTZ)-resistant Mycobacterium smegmatis (Msm) mutants and identified a strain, Msm-R1-2, exhibiting 16- and 64-fold increases in minimum inhibitory concentrations (MICs) to BTZ and linezolid (LZD), respectively, compared to the parental strain. Whole-genome sequencing revealed resistance-associated mutations in two functionally distinct genes: MSMEG_1380, encoding a transcriptional regulator involved in efflux pump expression, and MSMEG_0965, encoding a porin protein. CRISPR-Cpf1-assisted gene knockout and editing experiments confirmed that single mutations in either MSMEG_1380 or MSMEG_0965 caused low-level resistance (4-fold MIC increase) to BTZ and LZD, while dual mutations conferred resistance levels comparable to Msm-R1-2, with 16- and 64-fold increases in MICs for BTZ and LZD, respectively. An ethidium bromide accumulation assay demonstrated that mutations in MSMEG_0965 reduce cell wall permeability, contributing to multidrug resistance. Furthermore, quantitative real-time PCR showed that mutations in MSMEG_1380 upregulate the mmpS5-mmpL5 efflux system. Together, these dual mechanisms function synergistically: restricted drug entry combined with enhanced drug efflux confers robust multidrug resistance. These findings provide novel insights into the evolutionary mechanisms of resistance in mycobacteria. Full article
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