Volume 7, Issue 1 (4-2020)                   nbr 2020, 7(1): 55-63 | Back to browse issues page

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Tavanaeian S, Hamedi J, Haghighat S. Introducing antimicrobial exopolymer-producing actinobacteria from soils of Iran. nbr 2020; 7 (1) :55-63
URL: http://nbr.khu.ac.ir/article-1-3143-en.html
Introducing antimicrobial exopolymer-producing actinobacteria from soils of Iran
Sogol Tavanaeian , Javad Hamedi * , Setareh Haghighat
Department of Microbial Biotechnology, School of Biology and Center of Excellence in Phylogeny of Living Organisms, College of Science, University of Tehran, Tehran, Iran , jhamedi@ut.ac.ir
Abstract:   (4776 Views)
Exopolymers (EPS) are high-molecular-weight polymers secreted by some micro-organisms and have several applications in food, pharmaceutical, packaging and agricultural industries, as well as medicine. Actinobacteria are valuable bacteria in biotechnology and many commercial drugs such as antibiotics, antioxidants and immune-suppressant agents are derived from Actinobacteria. Recently, their other capabilities such as exopolymer production have been taken into consideration. Due to the high potential of actinobacteria in producing various compounds and increased prevalence of infections by antibiotic-resistant pathogens, the aim of the present study was to evaluate the potential of isolated Actinobacteria from various locations of Iran to produce EPS with antimicrobial activity. Appropriate dilutions of the samples were, therefore, cultured in ISP2 medium after treatment. The isolates were primarily identified by morphological tests. Then, their ability to produce EPS was investigated in BHI medium with 5% sucrose. The exopolymers of the most efficient strain were analyzed by UV-visible spectroscopy and FT-IR. Finally, the most efficient isolate was molecularly identified. Of the 120 isolates, 38 were able to produce EPS, and six had significant capability of producing EPS (10-14 g/L) and showed antibiotic activity against Staphylococcus aureus, Bacillus subtilis and Aspergillus niger. The EPS of the strain So49 had high absorbance in 190-230 nm, but did not have absorbance in 260-280 nm. Therefore, it does not have any protein impurity. The EPS has hydroxyl and carboxyl functional groups, according to FT-IR analysis. 16S rRNA gene analysis showed that the most efficient isolate had 99.68% similarity to Promicromonospora xylanilytica. 


 
Keywords: antibacterial activity, antifungal activity, polysaccharide, Promicromonospora, rare actinobacteria
Full-Text [PDF 1189 kb]   (1250 Downloads)    
Type of Study: Original Article | Subject: Microbiology
Received: 2018/06/27 | Revised: 2021/06/6 | Accepted: 2019/07/8 | Published: 2020/03/31 | ePublished: 2020/03/31
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