scholarly journals New Ecological Role of Seaweed Secondary Metabolites as Autotoxic and Allelopathic

2020 ◽  
Vol 11 ◽  
Author(s):  
Daniela Bueno Sudatti ◽  
Heitor Monteiro Duarte ◽  
Angélica Ribeiro Soares ◽  
Leonardo Tavares Salgado ◽  
Renato Crespo Pereira
Keyword(s):  
Secondary Metabolites ◽  
Ecological Role

scholarly journals Halogenated Metabolites from the Diet of Aplysia dactylomela Rang

Molecules ◽  
2020 ◽  
Vol 25 (4) ◽  
pp. 815
Author(s):  
Kishneth Palaniveloo ◽  
Mohammed Rizman-Idid ◽  
Thilahgavani Nagappan ◽  
Shariza Abdul Razak
Keyword(s):  
Secondary Metabolites ◽  
Defense Mechanism ◽  
Biologically Active ◽  
Ecological Role ◽  
Halogenated Metabolites ◽  
Self Defense ◽  
Pharmaceutical Applications ◽  
Aplysia Dactylomela ◽  
Dietary Origin

Invertebrates are an important source of structurally-diverse and biologically-active halogenated metabolites. The sea hare Aplysia dactylomela Rang has long been known to possess halogenated metabolites of dietary origin that are used as a self-defense mechanism. The compounds from Aplysia dactylomela Rang are comprised mainly of terpenoids and small percentages of C-15 acetogenins, indoles, macrolides, sterols and alkaloids with potent cytotoxic, anti-microbial and anti-inflammatory properties. For decades the metabolites discovered have been investigated for their medical and pharmaceutical applications, so much so that the ecological role of the metabolites has been overlooked. The interaction between Aplysia dactylomela Rang and its diet that is comprised of seaweed can provide information into the distribution and diversity of the seaweed, the application of bioaccumulated secondary metabolites as part of its defense mechanism and the potential roles of these metabolites for adaptation in the marine environment. This paper compiles the diversity of halogenated secondary metabolites documented from Aplysia dactylomela Rang.

The Ecological Role of Volatile and Soluble Secondary Metabolites Produced by Soil Bacteria

2017 ◽  
Vol 25 (4) ◽  
pp. 280-292 ◽  
Author(s):  
Olaf Tyc, ◽  
Chunxu Song ◽  
Jeroen S. Dickschat ◽  
Michiel Vos ◽  
Paolina Garbeva
Keyword(s):  
Secondary Metabolites ◽  
Soil Bacteria ◽  
Ecological Role

scholarly journals Secondary metabolites of Bacillus subtilis impact soil-derived semi-synthetic bacterial community assembly

2020 ◽  
Author(s):  
Heiko T. Kiesewalter ◽  
Carlos N. Lozano-Andrade ◽  
Mikael L. Strube ◽  
Ákos T. Kovács
Keyword(s):  
Bacillus Subtilis ◽  
Secondary Metabolites ◽  
Bacterial Communities ◽  
Amplicon Sequencing ◽  
Ecological Role ◽  
16S Amplicon Sequencing ◽  
Bacterial Protein Synthesis ◽  
Mock Communities

AbstractSecondary metabolites provide Bacillus subtilis with increased competitiveness towards other microorganisms. In particular nonribosomal peptides (NRPs) have an enormous antimicrobial potential by causing cell lysis, perforation of fungal membranes, enzyme inhibition or disruption of bacterial protein synthesis. This knowledge was primarily acquired in vitro when B. subtilis was competing with other microbial monocultures. However, our understanding of the true ecological role of these small molecules is limited.In this study, we have established soil-derived semi-synthetic mock communities containing 13 main genera and supplemented them with B. subtilis P5_B1 WT, its NRP deficient strain sfp or single NRP mutants incapable of producing surfactin, plipastatin or bacillaene. 16S amplicon sequencing revealed that the invasion of NRP-producing B. subtilis strains had no major impact on the bacterial communities. Still, the abundances of the two genera Lysinibacillus and Viridibacillus were reduced. Interestingly, this effect was diminished in communities supplemented with the NRPs deficient strain. Growth profiling of Lysinibacillus fusiformis M5 exposed to either spent media of the B. subtilis strains or pure surfactin indicates the sensitivity of this strain towards the biosurfactant surfactin.Our study provides a more in-depth insight into the influence of B. subtilis NRPs on semi-synthetic bacterial communities and helps to understand their ecological role.

scholarly journals Secondary metabolites of Bacillus subtilis impact the assembly of soil-derived semisynthetic bacterial communities

2020 ◽  
Vol 16 ◽  
pp. 2983-2998
Author(s):  
Heiko T Kiesewalter ◽  
Carlos N Lozano-Andrade ◽  
Mikael L Strube ◽  
Ákos T Kovács
Keyword(s):  
Bacillus Subtilis ◽  
Secondary Metabolites ◽  
Bacterial Communities ◽  
Amplicon Sequencing ◽  
Ecological Role ◽  
16S Amplicon Sequencing ◽  
Bacterial Protein Synthesis ◽  
Mock Communities

Secondary metabolites provide Bacillus subtilis with increased competitiveness towards other microorganisms. In particular, nonribosomal peptides (NRPs) have an enormous antimicrobial potential by causing cell lysis, perforation of fungal membranes, enzyme inhibition, or disruption of bacterial protein synthesis. This knowledge was primarily acquired in vitro when B. subtilis was competing with other microbial monocultures. However, our understanding of the true ecological role of these small molecules is limited. In this study, we have established soil-derived semisynthetic mock communities containing 13 main genera and supplemented them with B. subtilis P5_B1 WT, the NRP-deficient strain sfp, or single-NRP mutants incapable of producing surfactin, plipastatin, or bacillaene. Through 16S amplicon sequencing, it was revealed that the invasion of NRP-producing B. subtilis strains had no major impact on the bacterial communities. Still, the abundance of the two genera Lysinibacillus and Viridibacillus was reduced. Interestingly, this effect was diminished in communities supplemented with the NRP-deficient strain. Growth profiling of Lysinibacillus fusiformis M5 exposed to either spent media of the B. subtilis strains or pure surfactin indicated the sensitivity of this strain towards the biosurfactant surfactin. Our study provides a more in-depth insight into the influence of B. subtilis NRPs on semisynthetic bacterial communities and helps to understand their ecological role.

Ecological Role of Exopolysaccharides of Bacillariophyta: A Review

2017 ◽  
Vol 19 (1) ◽  
pp. 5-24 ◽  
Author(s):  
E. I. Shnyukova ◽  
E. K. Zolotareva
Keyword(s):  
Ecological Role
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