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Retracted Article: Functional disruption of staphylococcal accessory regulator A from Staphylococcus aureus by silver ions.

ABSTRACT: Silver ions (Ag⁺) have attracted profound attention due to their broad-spectrum antimicrobial activities. Although the antibacterial properties of silver have been well known for many centuries, its mechanism of action is not fully understood and its protein targets remain largely unknown. Staphylococcus aureus (S. aureus) is the leading cause of hospital- and community-acquired infections. Staphylococcal accessory regulator protein family from Staphylococcus aureus has been found to play vital roles in the regulation of virulence genes. In this study, we demonstrated that silver ions bind to the staphylococcal accessory regulator A (SarA) of S. aureus via its cysteine residues. Importantly, binding of silver ions leads to functional disruption of SarA. In addition, qRT-PCR experiments showed that silver also significantly attenuated the mRNA transcription levels of the genes which SarA regulated. Overall, these results provide new insights into the antibacterial mechanism of silver ions.

SUBMITTER: Liao X

PROVIDER: S-EPMC9056660 | biostudies-literature | 2020 Sep

REPOSITORIES: biostudies-literature

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Retracted Article: Functional disruption of staphylococcal accessory regulator A from Staphylococcus aureus by silver ions.

Liao Xiangwen X Jiang Guijuan G Wang Jing J Wang Jintao J

RSC advances 20200908 55

Silver ions (Ag+) have attracted profound attention due to their broad-spectrum antimicrobial activities. Although the antibacterial properties of silver have been well known for many centuries, its mechanism of action is not fully understood and its protein targets remain largely unknown. Staphylococcus aureus (S. aureus) is the leading cause of hospital- and community-acquired infections. Staphylococcal accessory regulator protein family from Staphylococcus aureus</ ...[more]

PMID: 35515077

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Project description:BackgroundStaphylococcus aureus (S. aureus) with accessory gene regulator (agr) dysfunction occurs in health care settings. This study evaluated the prevalence and the molecular and drug resistance characteristics of S. aureus with dysfunctional agr in a pediatric population in Beijing, China.ResultsA total of 269 nonduplicate S. aureus clinical isolates were isolated from Beijing Children's Hospital, including 211 methicillin-resistant S. aureus (MRSA) from September 2010-2017 and 58 methicillin-sensitive S. aureus (MSSA) from February 2016-2017. Only 8 MRSA and 2 MSSA isolates were identified as agr dysfunction, and the overall prevalence rate was 3.7%. For MRSA isolates, ST59-SCCmec IV and ST239-SCCmec III were the most common clones, and the prevalence rate of agr dysfunction in ST239-SCCmec III isolates (17.39%) was significantly higher than in ST59-SCCmec IV (1.69%) and other genotype strains (P = 0.006). Among the agr dysfunctional isolates, only one MRSA ST59 isolate and one MSSA ST22 isolate harbored pvl. No significant difference was detected between agr dysfunction and agr functional isolates regarding the biofilm formation ability (P = 0.4972); however, 9/10 agr dysfunctional isolates could effectuate strong biofilm formation and multidrug resistance. Among MRSA, the non-susceptibility rates to ciprofloxacin, gentamicin, and trimethoprim-sulfamethoxazole were significantly higher in agr dysfunctional isolates than in isolates with functional agr (P < 0.05). Two isolates belonging to ST239 had no mutations in agr locus, but a synonymous mutation was found in agrA in another ST239 isolate. The inactivating mutations were detected in other seven agr dysfunctional isolates. The variants were characterized by non-synonymous changes (n = 5) and frameshift mutations (insertions, n = 2), which mainly occurred in agrC and agrA.ConclusionsThe results showed that agr dysfunctional S. aureus was not common in Chinese children, and ST59-SCCmec IV was associated with lower prevalence of agr dysfunction as compared to ST239-SCCmec III isolates. The agr dysfunctional isolates were healthcare-associated, multidrug resistant and form strong biofilm, which suggested that agr dysfunction might offer potential advantages for S. aureus to survive in a medical environment.

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Retracted Article: Functional disruption of staphylococcal accessory regulator A from Staphylococcus aureus by silver ions.

Publications

Retracted Article: Functional disruption of staphylococcal accessory regulator A from <i>Staphylococcus aureus</i> by silver ions.

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