https://phys.org/news/2025-03-breakthrough-moment-class-antibiotics.html Phys.org Topics * Week's top * Latest news * Unread news * Subscribe [ ] Science X Account [ ] [ ] [*] Remember me Sign In Click here to sign in with or Forget Password? Not a member? Sign up Learn more * Nanotechnology * Physics * Earth * Astronomy & Space * Chemistry * Biology * Other Sciences * Medical Xpress Medicine * Tech Xplore Technology [INS::INS] * * share this! * 63 * Tweet * Share * Email 1. Home 2. Biology 3. Cell & Microbiology 1. Home 2. Biology 3. Molecular & Computational biology * * * --------------------------------------------------------------------- March 26, 2025 The GIST Editors' notes This article has been reviewed according to Science X's editorial process and policies. Editors have highlighted the following attributes while ensuring the content's credibility: fact-checked peer-reviewed publication trusted source proofread A breakthrough moment: Researchers discover new class of antibiotics by McMaster University A breakthrough moment: McMaster researchers discover new class of antibiotics A new class of antibiotics has been identified by McMaster University researchers. Credit: McMaster University The last time a new class of antibiotics reached the market was nearly three decades ago--but that could soon change, thanks to a discovery by researchers at McMaster University. A team led by researcher Gerry Wright has identified a strong candidate to challenge even some of the most drug-resistant bacteria on the planet: a new molecule called lariocidin. The findings were published in the journal Nature on March 26, 2025. The discovery of the all-new class of antibiotics responds to a critical need for new antimicrobial medicines, as bacteria and other microorganisms evolve new ways to withstand existing drugs. This phenomenon is called antimicrobial resistance--or AMR--and it's one of the top global public health threats, according to the World Health Organization. "Our old drugs are becoming less and less effective as bacteria become more and more resistant to them," explains Wright, a professor in McMaster's Department of Biochemistry and Biomedical Sciences and a researcher at the university's Michael G. DeGroote Institute for Infectious Disease Research. "About 4.5 million people die every year due to antibiotic-resistant infections, and it's only getting worse." Wright and his team found that the new molecule, a lasso peptide, holds great promise as an early drug lead because it attacks bacteria in a way that's different from other antibiotics. Lariocidin binds directly to a bacterium's protein synthesis machinery in a completely new way, inhibiting its ability to grow and survive. [INS::INS] "This is a new molecule with a new mode of action," Wright says. "It's a big leap forward for us." Lariocidin is produced by a type of bacteria called Paenibacillus, which the researchers retrieved from a soil sample collected from a Hamilton backyard. The research team allowed the soil bacteria to grow in the lab for approximately one year--a method that helped reveal even the slow-growing species that could have otherwise been missed. One of these bacteria, Paenibacillus, was producing a new substance that had strong activity against other bacteria, including those typically resistant to antibiotics. "When we figured out how this new molecule kills other bacteria, it was a breakthrough moment," says Manoj Jangra, a postdoctoral fellow in Wright's lab. In addition to its unique mode of action and its activity against otherwise drug-resistant bacteria, the researchers are optimistic about lariocidin because it ticks a lot of the right boxes: it's not toxic to human cells, it's not susceptible to existing mechanisms of antibiotic resistance, and it also works well in an animal model of infection. Wright and his team are now laser-focused on finding ways to modify the molecule and produce it in quantities large enough to allow for clinical development. Wright says because this new molecule is produced by bacteria--and "bacteria aren't interested in making new drugs for us"--much time and resources are needed before lariocidin is ready for market. "The initial discovery--the big a-ha! moment--was astounding for us, but now the real hard work begins," Wright says. "We're now working on ripping this molecule apart and putting it back together again to make it a better drug candidate." More information: Gerard Wright, A broad-spectrum lasso peptide antibiotic targeting the bacterial ribosome, Nature (2025). DOI: 10.1038/s41586-025-08723-7. www.nature.com/articles/ s41586-025-08723-7 Journal information: Nature Provided by McMaster University Citation: A breakthrough moment: Researchers discover new class of antibiotics (2025, March 26) retrieved 26 March 2025 from https:// phys.org/news/2025-03-breakthrough-moment-class-antibiotics.html This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. 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Lariocidin, a lasso peptide produced by Paenibacillus bacteria, inhibits bacterial protein synthesis in a novel way. It is non-toxic to human cells and effective against resistant strains. Efforts are underway to modify and produce it for clinical use. This summary was automatically generated using LLM. Full disclaimer Let us know if there is a problem with our content Use this form if you have come across a typo, inaccuracy or would like to send an edit request for the content on this page. For general inquiries, please use our contact form. For general feedback, use the public comments section below (please adhere to guidelines). Please select the most appropriate category to facilitate processing of your request [-- please select one -- ] [ ] [ ] [ ] [ ] [ ] Your message to the editors [ ] Your email (optional, only if you'd like a response) [ ] Send Feedback Thank you for taking time to provide your feedback to the editors. Your feedback is important to us. 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