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Characterization and antifouling activity analysis of extracellular polymeric substances produced by an epibiotic bacterial strain Kocuria flava associated with the green macroalga Ulva lactuca

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Acta Oceanologica Sinica 2021年第4期40卷 107-115页

作者： Mohammad Abdulaziz Ba-akdah sathianeson satheesh Department of Marine Biology Faculty of Marine SciencesKing Abdulaziz UniversityJeddah 21589Saudi Arabia

Extracellular polymeric substances(EPS)are present externally to the microorganisms and play an important role in attachment and biofilm *** polymers possess antibacterial and antifouling *** this study,the antifouling activity of EPS produced by an epibiotic bacterium associated with macroalga Ulva lactuca was assessed against fouling bacteria and barnacle *** indicate that the EPS isolated from the epibiotic bacterium inhibits the biofilm formation of the bacteria without much antibacterial ***,the EPS reduced the settlement of barnacle larvae on the hard substrate under laboratory *** epibiotic bacterium was identified as Kocuria flava based on 16 S rRNA gene *** EPS was further analysed using Fourier transform infrared(FT-IR),nuclear magnetic resonance(NMR)and X-ray diffraction(XRD)to understand the biochemical *** analysis revealed the presence of polysaccharides,proteins,acetyl amine and succinyl *** electron microscope analysis indicated that the EPS consisted of aggregated and irregular sphere-shaped particles.

关键词： biofouling antifouling Kocuria flava exopolymers antibiofilm activity Red Sea

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Chemical Defense of Soft Coral Sinularia polydactyla from the Red Sea Against Marine Biofilm-Forming Bacteria

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Journal of Ocean University of China 2018年第6期17卷 1451-1457页

作者： ESKandER Rehab AL-SOFYANI Abdulmohsin A. EL-SHERBINY Mohsen M.O. BA-AKDAH Mohammad Abdulaziz satheesh sathianeson Department of Marine Biology Faculty of Marine Sciences King Abdulaziz University

Soft corals are an important group of organisms that live in reef ecosystems. In this study, the chemical defense of soft coral Sinularia polydactyla against biofilm-forming bacteria was assessed. The soft coral S. polydactyla was collected from the Obhur creek of the Red Sea and the bioactive compounds were extracted under different conditions using methanol and hexane as solvents. Results revealed that the bioactive compounds produced by the soft coral S. polydactyla were active against the growth, hydrophobicity and extracellular polymeric substances production of the biofilm-forming bacteria. However, the damage or injury in soft coral tissue caused a decrease in the activity against biofilm-forming bacteria. GC-MS analysis revealed that sesquiterpenes were abundant in normal coral sample extract while cembranoids were abundant in damaged coral sample extracts. In general, the results indicated that the soft corals either under stress or with damage may not have a strong chemical defense against the colonizing marine organisms and competitors.

关键词： chemical ecology antifouling antibiofilm activity bioactive compound coral tissue damage

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Antibacterial and bioiflm inhibitory activities of bacteria associated with polychaetes

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Journal of Coastal Life Medicine 2015年第6期 495-502页

作者： Chellamnadar Vaikundavasagom Sunjaiy Shankar sathianeson satheesh Nadarajan Viju Stanislaus Mary Josephine Punitha Center for Marine Science and Technology Manonmaniam Sundaranar UniversityRajakkamangalamTamil NaduIndia Department of Marine Biology Faculty of Marine SciencesKing Abdulaziz UniversityJeddahSaudi Arabia

Objective:To study the antibacterial and antibiofilm activities expressed by epibiotic bacteria associated with the polychaetes Platynereis dumerilii and Syllis ***:A total of 32 cultivable bacterial strains were isolated from the two polychaete *** crude extracts were tested for antibacterial activity and biofilm inhibitory activity against pathogenic and biofilm-forming bacterial *** of the strains which showed strong activity were analyzed by thin-layer chromatography(TLC)and the bacterial strains were identified based on 16S rRNA gene ***:Extracts of 13 bacterial strains showed inhibitory activity against pathogenic and biofilm-forming *** crude extracts also affected the synthesis of extracellular polymeric substances and cell surface hydrophobicity of the Alteromonas *** from marine *** adhesion of Alteromonas *** glass surface showed significant variation between surface-associated bacterial crude extract treatment and control *** the 13 bacteria,two strains PA8 and PA19 were further analyzed for bioactive *** chromatography indicated the presence of a single active fraction in the crude extract of both the bacterial *** epibiotic bacterial strains P8 and P19 were identified as Exiguobacterium *** Actinobacterium *** based on 16S rRNA gene ***:The present study indicates that bacteria associated with marine invertebrates inhabiting the coastal waters could be used as a potential source for the isolation of bioactive metabolites.

关键词： Epibiotic bacteria Antimicrobial activity Biofilm Bioactive compounds Chemical ecology Marine drugs

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