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Jin M, Zhu S, Tang Y, Kong X, Wang X, Li Y, Jiang S, Wei L, Hu C, Wang B, Song W. Ayanin, a natural flavonoid inhibitor of Caseinolytic protease, is a promising therapeutic agent to combat methicillin-resistant Staphylococcus aureus infections. Biochem Pharmacol 2023; 217:115814. [PMID: 37769713 DOI: 10.1016/j.bcp.2023.115814] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Revised: 09/16/2023] [Accepted: 09/19/2023] [Indexed: 10/03/2023]
Abstract
Antimicrobial resistance (AMR) is a global health threat. The dramatic increase of Methicillin-resistant Staphylococcus aureus (MRSA) infections emphasizes the need to find new anti-infective agents with a novel mode of action. The Caseinolytic protease (ClpP) is a central virulence factor in stress survival, virulence, and antibiotic resistance of MRSA. Here, we found ayanin, a flavonoid isolated from Callicarpa nudiflora, was an inhibitor of MRSA ClpP with an IC50 of 19.63 μM. Using quantitative real-time PCR, ayanin reduced the virulence of Staphylococcus aureus (S. aureus) by down-regulating the level of some important virulence factors, including agrA, RNAⅢ, hla, pvl, psmα and spa. The results of cellular thermal shift assay and thermal shift assay revealed a binding between ayanin and ClpP. Molecular docking showed that ASP-168, ASN-173 and ARG-171 were the potential binding sites for ClpP binding to ayanin. ClpP mutagenesis study further indicated that ARG-171 and ASN-173 were the main active sites of ClpP. The affinity constant (KD) value of ayanin with ClpP was 3.15 × 10-5 M measured by surface plasmon resonance. In addition, ayanin exhibited a significant therapeutic effect on pneumonia infection induced by S. aureus in mice in vivo, especially in combination with vancomycin. This is the first report of ayanin with in vivo and in vitro efficacy against S. aureus infection. In conclusion, ayanin is a promising therapeutic agent to combat MRSA infections by targeting ClpP.
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Affiliation(s)
- Mengli Jin
- Changchun University of Chinese Medicine, Changchun 130117, China
| | - Shuyue Zhu
- Changchun University of Chinese Medicine, Changchun 130117, China
| | - Yating Tang
- Changchun University of Chinese Medicine, Changchun 130117, China
| | - Xiangri Kong
- Changchun University of Chinese Medicine, Changchun 130117, China
| | - Xingye Wang
- Changchun University of Chinese Medicine, Changchun 130117, China
| | - Yufen Li
- Changchun University of Chinese Medicine, Changchun 130117, China
| | - Shuang Jiang
- Changchun University of Chinese Medicine, Changchun 130117, China
| | - Lin Wei
- Changchun University of Chinese Medicine, Changchun 130117, China
| | - Chunjie Hu
- Changchun University of Chinese Medicine, Changchun 130117, China; Proctology Department, Affiliated Hospital of Changchun University of Chinese Medicine, Changchun 130021, China.
| | - Bingmei Wang
- Changchun University of Chinese Medicine, Changchun 130117, China.
| | - Wu Song
- Changchun University of Chinese Medicine, Changchun 130117, China.
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Zhang W, Margarita GE, Wu D, Yuan W, Yan S, Qi S, Xue X, Wang K, Wu L. Antibacterial Activity of Chinese Red Propolis against Staphylococcus aureus and MRSA. Molecules 2022; 27:molecules27051693. [PMID: 35268793 PMCID: PMC8911571 DOI: 10.3390/molecules27051693] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Revised: 01/10/2022] [Accepted: 01/13/2022] [Indexed: 11/16/2022] Open
Abstract
The antibacterial activity of propolis has long been of great interest, and the chemical composition of propolis is directly dependent on its source. We recently obtained a type of propolis from China with a red color. Firstly, the antibacterial properties of this unusual propolis were determined against Staphylococcus aureus and methicillin-resistant Staphylococcus aureus (MRSA). Studies on its composition identified and quantified 14 main polyphenols of Chinese red propolis extracts (RPE); quantification was carried out using liquid chromatography triple quadrupole tandem mass spectrometry (LC-QQQ-MS/MS) and RPE was found to be rich in pinobanksin, pinobanksin-3-acetate, and chrysin. In vitro investigations of its antibacterial activity revealed that its activity against S. aureus and MRSA is due to disruption of the cell wall and cell membrane, which then inhibits bacterial growth. Despite its similar antibacterial activities against S. aureus and MRSA, metabolomic analysis further revealed the effects of RPE on bacteria metabolism were different. The untargeted metabolomic results showed that a total of 7 metabolites in 12 metabolic pathways had significant changes (Fold change > 2, p < 0.05 *) after RPE treatment in S. aureus, while 11 metabolites in 9 metabolic pathways had significant changes (Fold change > 2, p < 0.05 *) after RPE treated on MRSA. Furthermore, RPE downregulated several specific genes related to bacterial biofilm formation, autolysis, cell wall synthesis, and bacterial virulence in MRSA. In conclusion, the data obtained indicate that RPE may be a promising therapeutic agent against S. aureus and MRSA.
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Affiliation(s)
- Wenwen Zhang
- Institute of Apicultural Research, Chinese Academy of Agricultural Sciences, Beijing 100094, China; (W.Z.); (S.Y.); (S.Q.); (X.X.)
| | | | - Di Wu
- College of Animal Science, Shanxi Agricultrual University, Jinzhong 030801, China;
| | - Wenqin Yuan
- School of Life Science, Liaocheng University, Liaocheng 252000, China;
| | - Sha Yan
- Institute of Apicultural Research, Chinese Academy of Agricultural Sciences, Beijing 100094, China; (W.Z.); (S.Y.); (S.Q.); (X.X.)
| | - Suzhen Qi
- Institute of Apicultural Research, Chinese Academy of Agricultural Sciences, Beijing 100094, China; (W.Z.); (S.Y.); (S.Q.); (X.X.)
| | - Xiaofeng Xue
- Institute of Apicultural Research, Chinese Academy of Agricultural Sciences, Beijing 100094, China; (W.Z.); (S.Y.); (S.Q.); (X.X.)
| | - Kai Wang
- Institute of Apicultural Research, Chinese Academy of Agricultural Sciences, Beijing 100094, China; (W.Z.); (S.Y.); (S.Q.); (X.X.)
- Correspondence: (K.W.); (L.W.)
| | - Liming Wu
- Institute of Apicultural Research, Chinese Academy of Agricultural Sciences, Beijing 100094, China; (W.Z.); (S.Y.); (S.Q.); (X.X.)
- Correspondence: (K.W.); (L.W.)
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Wang L, Wang G, Qu H, Wang K, Jing S, Guan S, Su L, Li Q, Wang D. Taxifolin, an Inhibitor of Sortase A, Interferes With the Adhesion of Methicillin-Resistant Staphylococcal aureus. Front Microbiol 2021; 12:686864. [PMID: 34295320 PMCID: PMC8290497 DOI: 10.3389/fmicb.2021.686864] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2021] [Accepted: 06/14/2021] [Indexed: 11/30/2022] Open
Abstract
The evolution and spread of methicillin-resistant Staphylococcus aureus (MRSA) poses a significant hidden risk to human public health. The majority of antibiotics used clinically have become mostly ineffective, and so the development of novel anti-infection strategies is urgently required. Since Staphylococcus aureus (S. aureus) cysteine transpeptidase sortase A (SrtA) mediates the surface-anchoring of proteins to its surface, compounds that inhibit SrtA are considered potential antivirulence treatments. Herein, we report on the efficacy of the potent SrtA inhibitor taxifolin (Tax), a flavonoid compound isolated from Chinese herbs. It was able to reversibly block the activity of SrtA with an IC50 of 24.53 ± 0.42 μM. Tax did not display toxicity toward mammalian cells or S. aureus at a concentration of 200 μM. In addition, Tax attenuated the virulence-related phenotype of SrtA in vitro by decreasing the adherence of S. aureus, reducing the formation of a biofilm, and anchoring of S. aureus protein A on its cell wall. The mechanism of the SrtA-Tax interaction was determined using a localized surface plasmon resonance assay. Subsequent mechanistic studies confirmed that Asp-170 and Gln-172 were the principal sites on SrtA with which it binds to Tax. Importantly, in vivo experiments demonstrated that Tax protects mice against pneumonia induced by lethal doses of MRSA, significantly improving their survival rate and reducing the number of viable S. aureus in the lung tissue. The present study indicates that Tax is a useful pioneer compound for the development of novel agents against S. aureus infections.
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Affiliation(s)
- Li Wang
- College of Animal Science, Jilin University, Changchun, China
| | - Guangming Wang
- Department of Neurosurgery, The First Hospital of Jilin University, Changchun, China
| | - Han Qu
- Changchun Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Changchun, China
| | - Kai Wang
- Changchun Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Changchun, China
| | - Shisong Jing
- College of Animal Science, Jilin University, Changchun, China
| | - Shuhan Guan
- College of Animal Science, Jilin University, Changchun, China
| | - Liyan Su
- College of Veterinary Medicine, Jilin University, Changchun, China
| | - Qianxue Li
- Changchun Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Changchun, China
| | - Dacheng Wang
- College of Animal Science, Jilin University, Changchun, China
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Wang L, Li Q, Li J, Jing S, Jin Y, Yang L, Yu H, Wang D, Wang T, Wang L. Eriodictyol as a Potential Candidate Inhibitor of Sortase A Protects Mice From Methicillin-Resistant Staphylococcus aureus-Induced Pneumonia. Front Microbiol 2021; 12:635710. [PMID: 33679670 PMCID: PMC7929976 DOI: 10.3389/fmicb.2021.635710] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Accepted: 01/27/2021] [Indexed: 12/17/2022] Open
Abstract
New anti-infective approaches are urgently needed to control multidrug-resistant (MDR) pathogens, such as methicillin-resistant Staphylococcus aureus (MRSA). Sortase A (SrtA) is a membrane-bound cysteine transpeptidase that plays an essential role in the catalysis of covalent anchoring of surface proteins to the cell wall of Staphylococcus aureus (S. aureus). The present study reports identification of a flavonoid, eriodictyol, as a reversible inhibitor of SrtA with an IC50 of 2.229 ± 0.014 μg/mL that can be used as an innovative means to counter both resistance and virulence. The data indicated that eriodictyol inhibited the adhesion of the bacteria to fibrinogen and reduced the formation of biofilms and anchoring of staphylococcal protein A (SpA) on the cell wall. The results of fluorescence quenching experiments demonstrated a strong interaction between eriodictyol and SrtA. Subsequent mechanistic studies revealed that eriodictyol binds to SrtA by interacting with R197 amino acid residue. Importantly, eriodictyol reduced the adhesion-dependent invasion of A549 cells by S. aureus and showed a good therapeutic effect in a model of mouse pneumonia induced by S. aureus. Overall, the results indicated that eriodictyol can attenuate MRSA virulence and prevent the development of resistance by inhibiting SrtA, suggesting that eriodictyol may be a promising lead compound for the control of MRSA infections.
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Affiliation(s)
- Li Wang
- College of Animal Science, Jilin University, Changchun, China
- Key Laboratory of Zoonosis Research, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, China
| | - Qianxue Li
- Key Laboratory of Jilin Province for Zoonosis Prevention and Control, Institute of Military Veterinary Science, Academy of Military Medical Science, Academy of Military Science, Changchun, China
| | - Jiaxin Li
- College of Animal Science, Jilin University, Changchun, China
| | - Shisong Jing
- College of Animal Science, Jilin University, Changchun, China
| | - Yajing Jin
- College of Animal Science, Jilin University, Changchun, China
| | - Lin Yang
- College of Animal Science, Jilin University, Changchun, China
| | - Hangqian Yu
- College of Animal Science, Jilin University, Changchun, China
| | - Dacheng Wang
- College of Animal Science, Jilin University, Changchun, China
| | - Tiedong Wang
- College of Animal Science, Jilin University, Changchun, China
| | - Lin Wang
- Key Laboratory of Zoonosis Research, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, China
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