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Djinni I, Conroy L, Varbanov M, Souagui S, Yanat B, Defant A, Kecha M, Mancini I. Bioprospecting the potential of metabolites from a Saharan saline soil strain Nocardiopsis dassonvillei GSBS4. J Basic Microbiol 2024; 64:50-67. [PMID: 37721354 DOI: 10.1002/jobm.202300162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Revised: 08/08/2023] [Accepted: 08/26/2023] [Indexed: 09/19/2023]
Abstract
Saharan soil samples collected in El-Oued province have been investigated for actinobacteria as a valuable source for the production of bioactive metabolites. A total of 273 isolates were obtained and subjected to antagonistic activity tests against human pathogenic germs. A strain with a broad-spectrum antimicrobial activity was selected and identified as Nocardiopsis dassonvillei GSBS4, with high sequence similarities to N. dassonvillei subsp. dassonvilleiT X97886.1 (99%) based on polyphasic taxonomy approach and 16S ribosomal ribonucleic acid gene sequence analysis. The GSBS4 ethyl acetate crude extract showed strong antibacterial activity towards pathogenic bacteria and Candida albicans. It inhibited biofilm formation by Staphylococcus aureus and methicillin-resistant S. aureus with minimum inhibitory concentrations estimated at 0.144 and 1.15 mg·mL-1 , respectively. A 44% biofilm reduction was obtained for S. aureus and 61% for Pseudomonas aeruginosa. Furthermore, phenols composition of the crude extract showed a significant dose-dependent antioxidant activity by α-diphenyl-β-picrylhydrazyl (57.21%) and 2,2'-azinobis (3-ethylbenzothiazoline-6-sulfonic acid) (64.29%) radicals scavenging assays. Although no inhibition was obtained on human coronavirus human coronavirus (HCoV) 229E and on model enterovirus (poliovirus 1) infection, a dose-dependent increase in cell viability of HCoV 229E-infected cells was noticed as the viability increased from 21% to 37%. Bioassay-guided fractionation of the crude extract gave a fraction showing antibacterial activity, which was analyzed by liquid chromatography-electrospray mass spectrometric technique, providing structural features on a major purple metabolite.
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Affiliation(s)
- Ibtissem Djinni
- Département de Microbiologie, Laboratoire de Microbiologie Appliquée, Faculté des Sciences de la Nature et de la Vie, Université de Bejaia, Bejaia, Algeria
- Bioorganic Chemistry Laboratory, Department of Physics, University of Trento, Povo Trento, Italy
| | - Leah Conroy
- Université de Lorraine, CNRS, Nancy, France
- RCSI School of Pharmacy and Biomolecular Sciences (PBS), Royal College of Surgeons in Ireland, Dublin, Ireland
| | - Mihayl Varbanov
- Université de Lorraine, CNRS, Nancy, France
- Laboratoire de Virologie, CHRU de Nancy Brabois, Vandœuvre-lès-Nancy, France
| | - Samiha Souagui
- Département de Microbiologie, Laboratoire de Microbiologie Appliquée, Faculté des Sciences de la Nature et de la Vie, Université de Bejaia, Bejaia, Algeria
| | - Betitera Yanat
- Département de Microbiologie, Laboratoire de Biotechnologie Végétale et Ethnobotanique, Faculté des Sciences de la Nature et de la Vie, Université de Bejaia, Bejaia, Algeria
| | - Andrea Defant
- Bioorganic Chemistry Laboratory, Department of Physics, University of Trento, Povo Trento, Italy
| | - Mouloud Kecha
- Département de Microbiologie, Laboratoire de Microbiologie Appliquée, Faculté des Sciences de la Nature et de la Vie, Université de Bejaia, Bejaia, Algeria
| | - Ines Mancini
- Bioorganic Chemistry Laboratory, Department of Physics, University of Trento, Povo Trento, Italy
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Microbial Biofilms and Antibiofilm Agents 2.0. Int J Mol Sci 2022; 23:ijms23147932. [PMID: 35887278 PMCID: PMC9321201 DOI: 10.3390/ijms23147932] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2022] [Accepted: 07/15/2022] [Indexed: 01/27/2023] Open
Abstract
It is estimated that <0 [...]
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Metal Complexes—A Promising Approach to Target Biofilm Associated Infections. Molecules 2022; 27:molecules27030758. [PMID: 35164021 PMCID: PMC8838073 DOI: 10.3390/molecules27030758] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Revised: 01/19/2022] [Accepted: 01/23/2022] [Indexed: 02/06/2023] Open
Abstract
Microbial biofilms are represented by sessile microbial communities with modified gene expression and phenotype, adhered to a surface and embedded in a matrix of self-produced extracellular polymeric substances (EPS). Microbial biofilms can develop on both prosthetic devices and tissues, generating chronic and persistent infections that cannot be eradicated with classical organic-based antimicrobials, because of their increased tolerance to antimicrobials and the host immune system. Several complexes based mostly on 3D ions have shown promising potential for fighting biofilm-associated infections, due to their large spectrum antimicrobial and anti-biofilm activity. The literature usually reports species containing Mn(II), Ni(II), Co(II), Cu(II) or Zn(II) and a large variety of multidentate ligands with chelating properties such as antibiotics, Schiff bases, biguanides, N-based macrocyclic and fused rings derivatives. This review presents the progress in the development of such species and their anti-biofilm activity, as well as the contribution of biomaterials science to incorporate these complexes in composite platforms for reducing the negative impact of medical biofilms.
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