Plant-Associated Endophytic Fungi and Its Secondary Metabolites Against Drug-Resistant Pathogenic Microbes

2022 ◽  
pp. 253-288
Author(s):  
Sriravali K. ◽  
Anil B. Jindal ◽  
Bhim Pratap Singh ◽  
Atish T. Paul
Keyword(s):  
Secondary Metabolites ◽  
Endophytic Fungi ◽  
Drug Resistant ◽  
Pathogenic Microbes

Bioactive Secondary Metabolites from Endophytic Fungi

2020 ◽  
Vol 27 (11) ◽  
pp. 1836-1854 ◽  
Author(s):  
Elena Ancheeva ◽  
Georgios Daletos ◽  
Peter Proksch
Keyword(s):  
Secondary Metabolites ◽  
Endophytic Fungi ◽  
Host Plants ◽  
Biological Activities ◽  
Cytotoxic Agents ◽  
Special Focus ◽  
Plant Metabolites ◽  
Direct Production ◽  
Bioactive Secondary Metabolites ◽  
Fungal Genes

Background: Endophytes represent a complex community of microorganisms colonizing asymptomatically internal tissues of higher plants. Several reports have shown that endophytes enhance the fitness of their host plants by direct production of bioactive secondary metabolites, which are involved in protecting the host against herbivores and pathogenic microbes. In addition, it is increasingly apparent that endophytes are able to biosynthesize medicinally important “phytochemicals”, originally believed to be produced only by their host plants. Objective: The present review provides an overview of secondary metabolites from endophytic fungi with pronounced biological activities covering the literature between 2010 and 2017. Special focus is given on studies aiming at exploration of the mode of action of these metabolites towards the discovery of leads from endophytic fungi. Moreover, this review critically evaluates the potential of endophytic fungi as alternative sources of bioactive “plant metabolites”. Results: Over the past few years, several promising lead structures from endophytic fungi have been described in the literature. In this review, 65 metabolites are outlined with pronounced biological activities, primarily as antimicrobial and cytotoxic agents. Some of these metabolites have shown to be highly selective or to possess novel mechanisms of action, which hold great promises as potential drug candidates. Conclusion: Endophytes represent an inexhaustible reservoir of pharmacologically important compounds. Moreover, endophytic fungi could be exploited for the sustainable production of bioactive “plant metabolites” in the future. Towards this aim, further insights into the dynamic endophyte - host plant interactions and origin of endophytic fungal genes would be of utmost importance.

Potential Antimicrobial Peptides Elucidation From The Marine Bacteria

2020 ◽  
Vol 18 ◽  
Author(s):  
Adyasa Barik ◽  
Pandiyan Rajesh ◽  
Manthiram Malathi ◽  
Vellaisamy Balasubramanian
Keyword(s):  
Antimicrobial Peptide ◽  
Marine Bacteria ◽  
Unnatural Amino Acids ◽  
Wide Spectrum ◽  
Drug Resistant ◽  
Medical Field ◽  
The World ◽  
Pathogenic Microbes ◽  
Antimicrobial Peptide Resistance ◽  
Significant Attention

: In recent years, over use of antibiotics has been raising its head to a serious problem all around the world as pathogens become drug resistant and create challenges to the medical field. This failure of most potent antibiotics that kill pathogens increases the thirst for research to look further way of killing pathogens. It has been led to the findings of antimicrobial peptide which is the most potent peptide to destroy pathogens. This review gives special emphasis to the usage of marine bacteria and other microorganisms for antimicrobial peptide (AMP) which are eco friendly as well as a developing class of natural and synthetic peptides with a wide spectrum of targets to pathogenic microbes. Consequently, a significant attention has been paid mainly to (i) the structure and types of anti microbial peptides and (ii) mode of action and mechanism of antimicrobial peptide resistance to pathogens. In addition to this, the designing of AMPs has been analysed thoroughly for reducing toxicity and developing better potent AMP. It has been done by the modified unnatural amino acids by amidation to target the control of biofilm and persister cell.

scholarly journals Bioactive Secondary Metabolites from the Mangrove Endophytic Fungi Nigrospora oryzae

2021 ◽  
Vol 21 (4) ◽  
pp. 1016
Author(s):  
Antonius Rolling Basa Ola ◽  
Titus Lapailaka ◽  
Hermania Em Wogo ◽  
Julinda Bendalina Dengga Henuk ◽  
Agnes Simamora ◽  
...  
Keyword(s):  
Secondary Metabolites ◽  
Endophytic Fungi ◽  
Antibacterial Agent ◽  
Mangrove Forest ◽  
Chemical Investigation ◽  
Terrestrial Environment ◽  
Agent Based ◽  
Bioactive Secondary Metabolites ◽  
Nigrospora Oryzae

Mangrove forest has a distinctive habitat adapting with marine and terrestrial environment. Chemical investigation of the extract from mangrove endophytic fungi Nigrospora oryzae had resulted in the isolation of sterigmatocystin (1) and pestalopyrone (2). The structure of sterigmatocystin (1) and pestalopyrone (2) were elucidated using mass, UV and NMR spectrometers together with the comparison with the literature data. The study also showed that sterigmatocystin displayed moderate cytotoxicity but it could be further developed as antiviral and antibacterial agent based on the SAR information reported from its analogue and derivatives.

scholarly journals Evaluation of antimicrobial, antioxidant and cytotoxic properties of bioactive compounds produced from endophytic fungi of Himalayan yew (Taxus wallichiana) in Nepal

F1000Research ◽  
2020 ◽  
Vol 9 ◽  
pp. 379 ◽  
Author(s):  
Dhurva Prasad Gauchan ◽  
Pratistha Kandel ◽  
Astha Tuladhar ◽  
Ashesh Acharya ◽  
Upendra Kadel ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Secondary Metabolites ◽  
Ethyl Acetate ◽  
Bioactive Compounds ◽  
Endophytic Fungi ◽  
Diffusion Method ◽  
Dry Extract ◽  
Brine Shrimp Lethality Assay ◽  
Fungal Extracts ◽  
Taxus Wallichiana

Background: Endophytic fungi are largely underexplored in the discovery of natural bioactive products though being rich sources of novel compounds with promising pharmaceutical potential. In this study, Taxus wallichiana, which has huge medicinal value, was investigated for its endophytic diversity and capability to produce bioactive secondary metabolites by analyzing antioxidant, antimicrobial and cytotoxic properties. Methods: The endophytes were identified by ITS-PCR using genomic DNA samples. The secondary metabolites were extracted by solvent extraction method using ethyl acetate. The antioxidant activity was analyzed by Thin Layer Chromatography, Total Phenol Content (TPC), Total Flavonoid Content (TFC) and DPPH assay, and the antimicrobial activity was analyzed by agar-well diffusion method. Brine shrimp lethality assay was used to analyze the cytotoxicity of the fungal extracts. Results: Out of 16 different Taxus trees sampled from different locations of Dhorpatan, 13 distinctive endophytic fungi were isolated and grouped into 9 different genera: Bjerkandera, Trichoderma, Preussia, Botrytis, Arthrinium, Alternaria, Cladosporium, Sporormiella and Daldinia. The ethyl acetate extracts isolated from three endophytic fungi: Alternaria alternata, Cladosporium cladosporioides and Alternaria brassicae showed significant TPC values of 204±6.144, 312.3±2.147 and 152.7±4.958µg GAE/mg of dry extract, respectively, and TFC values of 177.9±2.911, 644.1±4.202 and 96.38±3.851µg RE/mg of dry extract, respectively. Furthermore, these three extracts showed a dose dependent radical scavenging activity with IC50 concentration of 22.85, 22.15 and 23.001 µg/ml, respectively. The extracts of C. cladosporioides and A. brassicae also showed promising antimicrobial activity against Escherichia coli, Staphylococcus aureus and Bacillus subtilis with a minimum inhibitory concentration of 250μg/ml for all bacteria. Both the samples showed cytotoxic property against shrimp nauplii with LC50 of 104.2 and 125.9µg/ml, respectively. Conclusions: The crude fungal extracts obtained from endophytes: A. alternata, C. cladosporioides and A. brassicae upon purification and further identification of the bioactive compounds can be a fascinating source for novel pharmaceutical agents.

scholarly journals AMAZING ANTIMICROBIAL AND WOUND HEALING POTENTIAL OF ACACIA CATECHU BARK EXTRACTS- A REVIEW

2021 ◽  
pp. 1-7
Author(s):  
ARCHANA TIWARI ◽  
AVINASH TIWARI
Keyword(s):  
Wound Healing ◽  
Secondary Metabolites ◽  
Review Article ◽  
Present Review ◽  
Skin Infections ◽  
Bioactive Components ◽  
Medicinal Properties ◽  
Pathogenic Microbes ◽  
Acacia Catechu ◽  
Physiological Reactions

Plants are not only the source of food, oxygen, and shelter, but the same are also a potential foundation of medicines. Many natural and plant-derived antimicrobial and wound healing compounds have been recognized. In the present review, we have studied the main bioactive components of Acacia catechu with their medicinal roles. Most of these bioactive components are secondary metabolites which are produced by plants as side products of certain physiological reactions and are of no use for the plant itself. These components have been reported for their medicinal properties. In this review, we have mentioned some antibacterial, antifungal, and wound healing properties of A. catechu with its known bioactive components. The aim of this review article is, to enlist the possible potent bioactive components of the plant, against pathogenic microbes that can replace the use of chemicals and synthetic antibiotics for the treatment of skin infections and other diseases.

scholarly journals A Phenolic Compound of Endophytic Fungi Isolated from Stem of Syzygium aqueum and its Diuretic Activity

2021 ◽  
Vol 12 (5) ◽  
pp. 7040-7051
Keyword(s):  
Secondary Metabolites ◽  
Phenolic Compound ◽  
Endophytic Fungi ◽  
Endophytic Fungus ◽  
White Male ◽  
Urine Volume ◽  
Chloride Ions ◽  
Male Rats ◽  
Diuretic Activity ◽  
Fungus Extract

Guava (Syzygium aqueum), a typical Indonesian crop plant, has diuretic properties. Plants used as diuretic medicines can also be valuable sources for endophytic fungi containing diuretic drugs. The aims of this study were to isolate and identify endophytic fungi from S. aqueum stems, to isolate their secondary metabolites, and to conduct in vivo tests of the diuretic activity of an endophytic fungus extract on white male rats of the Wistar strain. Endophytic fungi were isolated by a direct plating method, and fungal isolates were identified molecularly. A phenolic compound was isolated by chromatography, and the chemical structure was identified spectroscopically. Doses of 100, 200, and 300 mg/kg BW were administered to white male rats divided into six groups (normal control, negative control, positive control, and the three treatment groups). Diuretic tests included urine volume; sodium, chloride, and calcium electrolyte levels; and pH. Phylogenetic analysis identified the endophytic fungal isolate as Trichoderma ghanense (isolation code SA1). The secondary metabolite isolated from the T. ghanense extract was a phenolic compound. Diuretic tests using the endophytic fungus extract showed the highest urine volume with a dose of 300 mg/kg BW. The diuretic test results showed an increase in urine volume and levels of sodium, potassium, and chloride ions in the urine. The extract of T. ghanense isolated from the stem of S. aqueum has the potential as initial therapy for hypertension because it contains phenolic secondary metabolites that show diuretic activity.

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