Secondary metabolites from cultures of the kiwi-associated fungus Diaporthe phragmitis and their antibacterial activity assessment

Phyllidiella nigra is an organism that is suspected to have secondary metabolites because their ability to develop its self defense system by camouflage and using chemical compounds derived from their nature diet as deterrent against their predators. The purpose of this study was to isolate symbiotic bacterial derived from P. nigra, extracted and followed by, the antibacterial assays against Escherichia coli and Bacillus megaterium as well as the anti-UV assay. The results showed that the five isolates tested had an antibacterial activity with the highest average inhibition zone against E. coli DSM 498 bacteria, isolate 1 (14.67 mm), isolate 5 (14 mm), and against B. Megaterium DSM 32T bacteria, isolate 3 (13.33 mm). The three isolates which had the highest inhibition zone and P. nigra extract were tested for anti-UV assay using a UV-Vis Spectrophotometer. The results obtained isolate 3 has absorption of UV-A with the UV absorbtion maximum at λ 340 nm and P. nigra extract has absorption on UV-B radiation with UV absorption maximum at λ 290 nm. Key words: Nudibranchia, Bacteria, Anti-bacteial, Anti-UV Phyllidiella nigra merupakan organisme yang diduga memiliki metabolit sekunder karena mampu mengembangkan sistem pertahanan dirinya dengan cara kamuflase dan menggunakan senyawa kimia sebagai racun yang didapat dari makanannya. Tujuan dari penelitian ini yaitu mendapatkan isolat bakteri yang bersimbiosis dengan P. nigra, mendapatkan ekstrak dari baktri simbion, dan menguji antibakteri dan anti-UV ekstrak etil aseta bakteri simbion dengan metode difusi agar terhadap bakteri Escherichia coli dan Bacillus megaterium. Hasil penelitian didapatkan kelima isolat yang diuji memiliki aktivitas antibakteri dengan rerata zona hambat tertinggi terhadap bakteri E. coli DSM 498 yaitu isolat 1 (14,67 mm), isolat 5 (14 mm), dan terhadap baktri B. megaterium DSM 32T yaitu isolat 3 (13,33 mm). Ketiga isolat yang memiliki zona hambat tertinggi dan ekstrak P. nigra diujikan anti-UV menggunakan alat UV-Vis Spektrofotometer. Hasil yang didapat isolat 3 memiliki serapan terhadap radiasi sinar UV-A dengan puncak tertinggi pada λ 340 nm dan ekstrak P. nigra memiliki serapan terhadap radiasi sinar UV-B dengan puncak tertinggi berada pada λ 290 nm. Kata kunci: Nudibranchia, Bacteria, Anti-bacteial, Anti-UV

Download Full-text

ANALYSIS OF SECONDARY METABOLITES, ANTIBACTERIAL ACTIVITY AND COMPOUND COMPOSITION IN THE SEA CUCUMBER Bohadschia sp. EXTRACT

Jurnal Ilmu dan Teknologi Kelautan Tropis ◽

10.29244/jitkt.v8i2.15831 ◽

2017 ◽

Vol 8 (2) ◽

pp. 645-653 ◽

Cited By ~ 1

Author(s):

Abdullah Rasyid

Keyword(s):

Antibacterial Activity ◽

Bacillus Subtilis ◽

Secondary Metabolites ◽

Sea Cucumber ◽

Similarity Index ◽

Diffusion Method ◽

Composition Analysis ◽

Activity Test ◽

Agar Diffusion Method ◽

Color Reactions

Bohadschia sp. is one of the sea cucumber species that has potential to be developed as a source of antibacterial from the sea. Samples of sea cucumber Bohadschia sp. used in this study collected from the Ratai bay waters, Lampung. This study aims to determine the type of secondary metabolites, antibacterial activity and compound composition analysis containing in the sea cucumber extract. Identification of secondary metabolites by observation of color reactions, precipitation and foam. The method used to antibacterial activity test was the agar diffusion method, while identification of the composition of compounds performed with Gas Chromatogaphy-Mass Spectroscopy (GC-MS) method.Top of FormThe results showed that the type of secondary metabolites contained in the extract of sea cucumber Bohadschia sp. were steroids and saponins. The extract of sea cucumber Bohadschia sp. showed antibacterial activity against Bacillus subtilis and Vibrio eltor. Results of GC-MS were 12 compounds and have a similarity index same or more than 90%. All compounds consist of organosilicon cyclic, fatty acid, steroid, cyclo alkene and alkena. The compound with biggest abundance was cholest-5-en-3-yl nonanoate (4.89%) and retention time was 37.370 minutes.

Download Full-text

Secondary metabolites of a marine-derived Penicillium ochrochloron

Notulae Scientia Biologicae ◽

10.15835/nsb13311020 ◽

2021 ◽

Vol 13 (3) ◽

pp. 11020

Author(s):

Peter M. EZE ◽

Ying GAO ◽

Yang LIU ◽

Lasse Van GEELEN ◽

Chika P. EJIKEUGWU ◽

...

Keyword(s):

Antibacterial Activity ◽

Secondary Metabolites ◽

Biological Properties ◽

Industrial Applications ◽

Biologically Active ◽

Fungal Isolation ◽

The North ◽

Wide Range ◽

Extremophilic Fungi ◽

Fungal Secondary Metabolites

Extremophilic fungi have received considerable attention recently as new promising sources of biologically active compounds with potential pharmaceutical applications. This study investigated the secondary metabolites of a marine-derived Penicillium ochrochloron isolated from underwater sea sand collected from the North Sea in St. Peter-Ording, Germany. Standard techniques were used for fungal isolation, taxonomic identification, fermentation, extraction, and isolation of fungal secondary metabolites. Chromatographic separation and spectroscopic analyses of the fungal secondary metabolites yielded eight compounds: talumarin A (1), aspergillumarin A (2), andrastin A (3), clavatol (4), 3-acetylphenol (5), methyl 2,5-dihydro-4-hydroxy-5-oxo-3-phenyl-2-furanpropanoate (6), emodin (7) and 2-chloroemodin (8). After co-cultivation with Bacillus subtilis, the fungus was induced to express (-)-striatisporolide A (9). Compound 1 was evaluated for antibacterial activity against Staphylococcus aureus, Acinetobacter baumannii, Mycobacterium smegmatis, and M. tuberculosis, as well as cytotoxicity against THP-1 cells. The compound, however, was not cytotoxic to THP-1 cells and had no antibacterial activity against the microorganisms tested. The compounds isolated from P. ochrochloron in this study are well-known compounds with a wide range of beneficial biological properties that can be explored for pharmaceutical, agricultural, or industrial applications. This study highlights the bioprospecting potential of marine fungi and confirms co-cultivation as a useful strategy for the discovery of new natural products.

Download Full-text

Malagasy Liverworts, Source of New and Biologically Active Compounds

Natural Product Communications ◽

10.1177/1934578x0700200616 ◽

2007 ◽

Vol 2 (6) ◽

pp. 1934578X0700200 ◽

Cited By ~ 8

Author(s):

Liva Harinantenaina ◽

Yoshinori Asakawa

Keyword(s):

Antibacterial Activity ◽

Secondary Metabolites ◽

Aromatic Compounds ◽

Biological Activities ◽

Biologically Active ◽

Raw 264.7 Cells ◽

No Production ◽

Raw 264.7 ◽

Strong Inhibition ◽

Phytochemical Investigation

The phytochemical investigation of eight Jungermaniales liverwort species: Bazzania decrescens, B. madagassa (Lepidoziaceae), Plagiochila barteri, P. terebrans (Plagiochilaceae), Isotachis aubertii (Isotachidaceae), Mastigophora diclados (Lepicoleaceae), Radula appressa (Radulaceae), and Thysananthus spathulistipus (Lejeuneaceae), collected from Madagascar, has been carried out to afford new and structurally interesting terpenoids and aromatic compounds. The biological activities of the isolated secondary metabolites were determined and the herbertene-type sesquiterpenoids were shown to have antibacterial activity. A new ent-clerodane diterpene from Thysananthus spathulistipus and bis-bibenzyls-type aromatic compounds exhibited strong inhibition of NO production in RAW 264.7 cells, while marchantin C produced moderate α-glucosidase inhibition. The chemosystematics of the studied species are discussed.

Download Full-text

Mycosynthesis of ZnO Nanoparticles Using Trichoderma spp. Isolated from Rhizosphere Soils and Its Synergistic Antibacterial Effect against Xanthomonas oryzae pv. oryzae

Journal of Fungi ◽

10.3390/jof6030181 ◽

2020 ◽

Vol 6 (3) ◽

pp. 181

Author(s):

Balagangadharaswamy Shobha ◽

Thimappa Ramachandrappa Lakshmeesha ◽

Mohammad Azam Ansari ◽

Ahmad Almatroudi ◽

Mohammad A. Alzohairy ◽

...

Keyword(s):

Antibacterial Activity ◽

Secondary Metabolites ◽

Trichoderma Reesei ◽

Xanthomonas Oryzae ◽

Causative Organism ◽

Dependent Manner ◽

Zno Nps ◽

Trichoderma Spp ◽

Beneficial Effects ◽

Plant Growth Promoting

The Plant Growth Promoting Fungi (PGPF) is used as a source of biofertilizers due to their production of secondary metabolites and beneficial effects on plants. The present work is focused on the co-cultivation of Trichoderma spp. (T. harzianum (PGT4), T. reesei (PGT5) and T. reesei (PGT13)) and the production of secondary metabolites from mono and co-culture and mycosynthesis of zinc oxide nanoparticles (ZnO NPs), which were characterized by a UV visible spectrophotometer, Powder X-ray Diffraction (PXRD), Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM) with Energy Dispersive Spectroscopy (EDAX) and Transmission Electron Microscope (TEM) and Selected Area (Electron) Diffraction (SAED) patterns. The fungal secondary metabolite crude was extracted from the mono and co-culture of Trichoderma spp. And were analyzed by GC-MS, which was further subjected for antibacterial activity against Xanthomonas oryzae pv. Oryzae, the causative organism for Bacterial Leaf Blight (BLB) in rice. Our results showed that the maximum zone of inhibition was recorded from the co-culture of Trichoderma spp. rather than mono cultures, which indicates that co-cultivation of beneficial fungi can stimulate the synthesis of novel secondary metabolites better than in monocultures. ZnO NPs were synthesized from fungal secondary metabolites of mono cultures of Trichoderma harzianum (PGT4), Trichoderma reesei (PGT5), Trichoderma reesei (PGT13) and co-culture (PGT4 + PGT5 + PGT13). These ZnO NPs were checked for antibacterial activity against Xoo, which was found to be of a dose-dependent manner. In summary, the biosynthesized ZnO NPs and secondary metabolites from co-culture of Trichoderma spp. are ecofriendly and can be used as an alternative for chemical fertilizers in agriculture.

Download Full-text

Potent Antibacterial Prenylated Acetophenones from the Australian Endemic Plant Acronychia crassipetala

Antibiotics ◽

10.3390/antibiotics9080487 ◽

2020 ◽

Vol 9 (8) ◽

pp. 487 ◽

Cited By ~ 1

Author(s):

Trong D. Tran ◽

Malin A. Olsson ◽

David J. McMillan ◽

Jason K. Cullen ◽

Peter G. Parsons ◽

...

Keyword(s):

Staphylococcus Aureus ◽

Antibacterial Activity ◽

Secondary Metabolites ◽

First Record ◽

Endemic Plant ◽

Structural Characterisation ◽

Gram Positive Bacteria ◽

Spectroscopic Analyses ◽

Therapeutic Properties ◽

Endemic Plant Species

Acronychia crassipetala is an endemic plant species in Australia. Its phytochemistry and therapeutic properties are underexplored. The hexane extract of the fruit A. crassipetala T. G. Hartley was found to inhibit the growth of the Gram-positive bacteria Staphylococcus aureus. Following bio-activity guided fractionation, two prenylated acetophenones, crassipetalonol A (1) and crassipetalone A (2), were isolated. Their structures were determined mainly by NMR and MS spectroscopic analyses. This is the first record of the isolation and structural characterisation of secondary metabolites from the species A. crassipetala. Their antibacterial and cytotoxic assessments indicated that the known compound (2) had more potent antibacterial activity than the antibiotic chloramphenicol, while the new compound (1) showed moderate cytotoxicity.

Download Full-text

Genomic and Metabolomic Analysis of Antarctic Bacteria Revealed Culture and Elicitation Conditions for the Production of Antimicrobial Compounds

Biomolecules ◽

10.3390/biom10050673 ◽

2020 ◽

Vol 10 (5) ◽

pp. 673

Author(s):

Kattia Núñez-Montero ◽

Damián Quezada-Solís ◽

Zeinab G. Khalil ◽

Robert J. Capon ◽

Fernando D. Andreote ◽

...

Keyword(s):

Antibacterial Activity ◽

Secondary Metabolites ◽

Culture Media ◽

Genome Mining ◽

Gene Clusters ◽

Culture Conditions ◽

Bioactive Metabolites ◽

Bacterial Strains ◽

Antarctic Bacteria ◽

New Antibiotics

Concern about finding new antibiotics against drug-resistant pathogens is increasing every year. Antarctic bacteria have been proposed as an unexplored source of bioactive metabolites; however, most biosynthetic gene clusters (BGCs) producing secondary metabolites remain silent under common culture conditions. Our work aimed to characterize elicitation conditions for the production of antibacterial secondary metabolites from 34 Antarctic bacterial strains based on MS/MS metabolomics and genome mining approaches. Bacterial strains were cultivated under different nutrient and elicitation conditions, including the addition of lipopolysaccharide (LPS), sodium nitroprusside (SNP), and coculture. Metabolomes were obtained by HPLC-QTOF-MS/MS and analyzed through molecular networking. Antibacterial activity was determined, and seven strains were selected for genome sequencing and analysis. Biosynthesis pathways were activated by all the elicitation treatments, which varies among strains and dependents of culture media. Increased antibacterial activity was observed for a few strains and addition of LPS was related with inhibition of Gram-negative pathogens. Antibiotic BGCs were found for all selected strains and the expressions of putative actinomycin, carotenoids, and bacillibactin were characterized by comparison of genomic and metabolomic data. This work established the use of promising new elicitors for bioprospection of Antarctic bacteria and highlights the importance of new “-omics” comparative approaches for drug discovery.

Download Full-text