Nine peptides, termed ranatuerins 1-9, with antimicrobial activity towards Staphylococcus aureus, were isolated from an extract of the skin of the adult American bullfrog, Rana catesbeiana. In common with other cytolytic peptides from Ranid frogs, (e.g. ranalexin, gaegurins, brevinins), ranatuerins 1 and 4 contain an intramolecular disulfide bridge forming a heptapeptide ring whereas in ranatuerins 2 and 3 the disulfide bridge forms a hexapeptide ring. The structurally related ranatuerins 5-9 comprise 12 - 14 amino acids and show sequence similarity towards the hemolytic peptides A1 and B9 previously isolated from the skin of Rana esculenta. Of the peptides purified, ranatuerin 1 (SMLSVLKNLGKVGLG FVACKINKQC) showed the broadest spectrum of antimicrobial action with inhibitory activity against S. aureus, Escherichia coli and Candida albicans.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1006/bbrc.1998.9362 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Combining magnetically isolated CD45 cells with serum maintains intact drug responsiveness for ELISpot analysis in clinical trials.
Immunohorizons
January 2025
Agilex Biolabs, Adelaide, South Australia, Australia.
Enzyme-linked immunosorbent spot analysis is frequently used to investigate immune responsiveness during clinical trials. However, ELISpot classically utilizes peripheral blood mononuclear cell isolates from whole blood, requiring relatively high blood draw volumes and removing both granulocytes and bound drug. Here, we describe a novel protocol whereby CD45 cells are magnetically isolated from human whole blood and co-incubated with serum isolated from the same subject.
View Article and Find Full Text PDFShorter Digestion Times of Donor Islets Is Associated With Better Islet Graft Function After Islet Transplantation.
Cell Transplant
January 2025
Department of Translational Research & Cellular Therapeutics, Arthur Riggs Diabetes & Metabolism Research Institute, City of Hope, Duarte, CA, USA.
Although islet transplantation is effective in reducing severe hypoglycemia events and controlling blood glucose in patients with type 1 diabetes, maintaining islet graft function long-term is a significant challenge. Islets from multiple donors are often needed to achieve insulin independence, and even then, islet function can decline over time when metabolic demand exceeds islet mass/insulin secretory capacity. We previously developed a method that calculated the islet graft function index (GFI) and a patient's predicted insulin requirement (PIR) using mathematical nonlinear regression.
View Article and Find Full Text PDFλ-cyhalothrin induced sex-specific inflammation, glia activation and GABAergic interneuron disruption in the hippocampus of rats.
BMC Pharmacol Toxicol
January 2025
Department of Anatomy, College of Health Sciences, University of Ilorin, Ilorin, 240003, Nigeria.
Background: Glia mediated neuroinflammation and degeneration of inhibitory GABAergic interneurons are some of the hall marks of pyrethroid neurotoxicity. Here we investigated the sex specific responses of inflammatory cytokines, microglia, astrocyte and parvalbumin positive inhibitory GABAergic interneurons to λ-cyhalothrin (LCT) exposures in rats.
Methods: Equal numbers of male and female rats were given oral corn oil, 2 mg/kg.
Sustainable utilization of bovine adipose tissue derivatives as robust antimicrobial agents against Methicillin-resistant Staphylococcus aureus.
BMC Microbiol
January 2025
Department of Internal Medicine and Infectious Diseases (Infectious Diseases), Faulty of Veterinary Medicine, Cairo University, Giza, Egypt.
Background: The excessive use of antibiotics is a major contributor to the global issue of antimicrobial resistance (AMR), a significant threat to human and animal health. Hence, assessing new strategies for managing Multi-Drug Resistant (MDR) microorganisms is vital. In this study, the use of mechanically isolated mature adipose cells (MIMACs) and their lysate (Adipolysate) as a new sustainable antimicrobial agent was assessed against Methicillin-resistant Staphylococcus aureus (MRSA).
View Article and Find Full Text PDFScoring Conformational Metastability of Macrocyclic Peptides with Binding Pose Metadynamics.
J Chem Inf Model
January 2025
Department of Modeling and Informatics, Merck & Co., Inc., Rahway, New Jersey 07065, United States.
Potency optimization of macrocyclic peptides can include both modifying intermolecular interactions and modifying the conformational stability of the bioactive conformation. However, the number of possible modifications is vast. To identify modifications that enhance the stability of the binding conformations in a cost-effective manner, there is a need for a high-throughput in-silico method that scores the conformational stability of these modified molecules.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!