SMART researchers use lysins to selectively target bacteria

Researchers from the Antimicrobial Resistance (AMR) Interdisciplinary Research Group (IRG) at Singapore-MIT Alliance for Research and Technology (SMART), MIT’s research enterprise in Singapore, have developed a method to produce customizable engineered lysins that can be used to selectively kill bacteria of interest while leaving others unharmed. The discovery presents a promising alternative to antibiotics for treating existing drug-resistant bacteria and bacterial infections without the risk of causing resistance.

Lysins are enzymes produced by bacteriophages to break open the bacteria cells while treating infections and have demonstrated potential as a novel class of antimicrobials. A major advantage of lysins is that they allow fast and targeted killing against a specific bacterium of choice without inducing resistance.

Photo of two researchers wearing masks and examining a Petri dish
Caption: SMART AMR researchers Boon Chong Goh (left) and Linh Chi Dam evaluate bacterial cells after treatment with lysins.
Image credit: SMART.

The emergence of multidrug-resistant bacteria has left even minor bacterial infections incurable by many existing antibiotics, with at least 700,000 deaths each year due to drug-resistant diseases, according to the World Health Organization.

In a paper titled “Engineered Lysins with Customized Lytic Activities Against Enterococci and Staphylococci” recently published in the prestigious journal Frontiers in Microbiology, the SMART AMR team demonstrates one of the methods to customize the lytic spectrum of engineered lysins.

The study reveals how the engineered lysins were able to selectively kill bacteria such as staphylococcus Enterococcus faecalis, while leaving the Enterococcus faecium bacteria of the same genus unharmed. This is the first report of a chimeric lysin that can both target bacteria of multiple genera and selectively kill one bacterial species within a genus over another.

“The human body contains trillions of bacteria, which form the microbiome, and the majority of the bacteria is either harmless or beneficial to us,” says AMR research scientist and corresponding author of the paper Boon Chong Goh. “What happens when we are on an antibiotic course is that the antibiotics kill all of the bacteria, leaving us vulnerable to a worse reinfection after we have completed the antibiotic course. Since lysins respect the microbiome and only eliminate the bad pathogenic bacteria, they are a very promising alternative for treating bacterial infections.”

Awarded with the Ignition and Innovation Grants from SMART Innovation Center, Goh’s team has established the foundation of a technology platform by producing the lysins and testing them in vitro, and are in the process of developing a series of techniques to engineer the lysins.

“Since lysins are essentially proteins, they can be engineered and mass-produced,” says Hana Sakina Bte Muhammad Jai, lead author of the paper and laboratory assistant under Goh’s team at SMART. “Our study clearly shows how modifying these proteins translate to improvements of their specificity and antibacterial activities.”

“In the lab, we have observed that once a small amount of lysin is added, it only takes 30 minutes to completely kill the bacteria, making them a very safe and efficient choice for removing unwanted bacteria,” says Linh Chi Dam, the co-first author of the paper and laboratory technologist under Goh’s team. “While developments in the production of customized lysins would greatly impact pharmaceutical industries where lysins can be used to treat bacterial infections, skin-care and consumer care industries would also benefit by using lysins as a targeted agent to remove unwanted bacteria from their products.”

The research is carried out by SMART and supported by the National Research Foundation (NRF) Singapore under the Campus for Research Excellence and Technological Enterprise (CREATE). The SMART AMR team was also recently awarded the Intra-CREATE Seed Collaboration Grant to investigate lysins targeting gram-negative bacteria such as Pseudomonas aeruginosa, Acinetobacter baumannii, and Klebsiella pneumoniae.

SMART was established by MIT in partnership with the NRF in 2007. SMART is the first entity in CREATE. SMART serves as an intellectual and innovation hub for research interactions between MIT and Singapore, undertaking cutting-edge research projects in areas of interest to both. SMART currently comprises an Innovation Center and five IRGs: AMR, Critical Analytics for Manufacturing Personalized-Medicine, Disruptive and Sustainable Technologies for Agricultural Precision, Future Urban Mobility, and Low Energy Electronic Systems.

The AMR IRG is a translational research and entrepreneurship program that tackles the growing threat of antimicrobial resistance. By leveraging talent and convergent technologies across Singapore and MIT, they tackle AMR head-on by developing multiple innovative and disruptive approaches to identify, respond to, and treat drug-resistant microbial infections in order to provide transformative, holistic solutions for Singapore and the world.

Written by Singapore-MIT Alliance for Research and Technology

Source: Massachusetts Institute of Technology

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