3 research outputs found
New Insights about Antibiotic Production by Pseudomonas aeruginosa: A Gene Expression Analysis
The bacterial resistance for antibiotics is one of the most important problems in public health and only a small number of new products are in development. Antagonistic microorganisms from soil are a promising source of new candidate molecules. Products of secondary metabolism confer adaptive advantages for their producer, in the competition for nutrients in the microbial community. The biosynthesis process of compounds with antibiotic activity is the key to optimize their production and the transcriptomic study of microorganisms is of great benefit for the discovery of these metabolic pathways. Pseudomonas aeruginosa LV strain growing in the presence of copper chloride produces a bioactive organometallic compound, which has a potent antimicrobial activity against various microorganisms. The objective of this study was to verify overexpressed genes and evaluate their relation to the organometallic biosynthesis in this microorganism. P. aeruginosa LV strain was cultured in presence and absence of copper chloride. Two methods were used for transcriptomic analysis, genome reference-guided assembly and de novo assembly. The genome referenced analysis identified nine upregulated genes when bacteria were exposed to copper chloride, while the De Novo Assembly identified 12 upregulated genes. Nineteen genes can be related to an increased microbial metabolism for the extrusion process of exceeding intracellular copper. Two important genes are related to the biosynthesis of phenazine and tetrapyrroles compounds, which can be involved in the bioremediation of intracellular copper and we suggesting that may involve in the biosynthesis of the organometallic compound. Additional studies are being carried out to further prove the function of the described genes and relate them to the biosynthetic pathway of the organometallic compound
Sulfonated (1 → 6)-β‑d‑Glucan (Lasiodiplodan): A Promising Candidate against the Acyclovir-Resistant Herpes Simplex Virus Type 1 (HSV-1) Strain
Herpes
simplex virus type 1 (HSV-1) is a persistent human
pathogen,
and the emergence of strains resistant to Acyclovir (ACV, reference
drug) shows the urgency to develop new treatments. We report the antiherpetic
mechanism of the action of lasiodiplodan (LAS-N, (1 → 6)-β-d-glucan) and its sulfonated derivative (LAS-S3) in vitro and
in vivo. LAS-S3 showed anti-HSV-1 action with high selectivity indices
for HSV-1 KOS (88.1) and AR (189.2), sensitive and resistant to ACV,
respectively. LAS-S3 inhibited >80% of HSV-1 infection in different
treatment protocols (virucidal, adsorption inhibition, and post-adsorption
effects), even at low doses, and showed a preventive effect and DNA
and protein synthesis inhibition. The antiherpetic effect was confirmed
in vivo by the cosmetic LAS-S3-CRÈME decreasing cutaneous lesions
of HSV-1, including the AR strain. LAS-S3 possessed a broad-spectrum
mechanism of action acting in the early and post-adsorption stages
of HSV-1 infection, and LAS-S3-CRÈME is a potential antiherpetic
candidate for patients infected by HSV-1-resistant strains