Abstract
The biodiversity of actinobacteria in the Mediterranean Sea habitat has drawn limited attention compared to that paid to terrestrial habitats. The work presented here focused on the biodiversity of culturable marine actinobacteria from sediments and seawater collected from the Algerian coast, and led to the identification of 114 actinobacterial isolates. The morphological study revealed higher actinobacterial diversity in sediment than in seawater. Fifty strains were selected for 16 S rRNAgene sequencing. The results revealed that the isolates belonged to ten different genera, Streptomyces (n = 17) and Micromonospora (n = 15) being the most dominant. The remaining actinobacterial isolates, identified as belonging to rare genera, included Nocardia (n = 5), Nocardiopsis (n = 3), Saccharothrix (n = 2), Rhodococcus (n = 2), Promicromonospora (n = 2), Nonomuraea (n = 2), Actinomadura (n = 1) and Saccharomonospora (n = 1). Interestingly, through 16 S rRNA sequence-based identification and phylogenetic analysis, two strains of the genus Streptomyces (MAT1 and MAS22) and a strain of the genus Nonomuraea (MAG8) both constituted a novel species. Screening of antibacterial activity of identified isolates against a panel of human pathogenic bacteria demonstrated that 36% of the isolates were active, particularly against Gram-positive bacteria. The ability to grow in the presence of NaCl and seawater revealed that 98% of the strains were halotolerant, with different levels of NaCl acceptance (from 3 to 13%) but no isolates required seawater to grow.
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Data Availability
The DNA sequences were deposited in the National Centre for Biotechnology Information (NCBI)-GenBank under accession numbers from OM033412 to OM033461.
Abbreviations
- CA:
-
Cluster Analysis
- ISCC-NBS:
-
Inter-Society Color Council-National Bureau of Standards
- MEGA:
-
Molecular Evolutionary Genetics Analysis
- NCBI:
-
National Centre for Biotechnology Information
- PCA:
-
Principal Component Analysis
- PCR:
-
Polymerase Chain Reaction
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Acknowledgements
We thank the late Prof. Sabaou N (LBSM, Ecole Normale Supérieure de Kouba, Algiers, Algeria) for great help in isolation and taxonomic analysis of actinobacteria.
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This research was supported by the Laboratoire de Biologie des Systèmes Microbiens.
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A.M. performance of the experiments, and wrote the first draft of the manuscript, A.Y. supervision of the experiments, multivariate data analysis, discussion of the results and correction of the manuscript, M.Y.B. assistance in the evaluation the bioactivity test, N.B. technical assistance in actinobacterial characterization, A.Z. and S.M. secured funding and assistance in phylogenitic study, A.M. designed and planned the experiments with correction of the manuscript, and C.V.V. finance of the molecular identification, technical assistance in molecular identification and correction of the manuscript.
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Matmoura, A., Yekkour, A., Boufadi, M.Y. et al. Exploration of actinobacteria communities in seawater and sediments of mediterranean basin from Algerian coast displays hight diversity with new taxa and antibacterial potential. Biologia 78, 2219–2231 (2023). https://doi.org/10.1007/s11756-023-01353-2
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DOI: https://doi.org/10.1007/s11756-023-01353-2