24-07-2025
CSIR–CCMB Scientists find ‘proofreading' enzyme in bacteria
HYDERABAD: A team of scientists at the CSIR–Centre for Cellular and Molecular Biology (CCMB), Hyderabad, led by Dr Manjula Reddy, has discovered a novel proofreading mechanism in bacteria that could pave the way for new antibiotics and deepen understanding of human immune disorders. The findings were published in the journal Proceedings of the National Academy of Sciences (PNAS).
The study reveals that during cell wall construction, bacteria can mistakenly add amino acids like L-serine or glycine instead of L-alanine, weakening the wall and increasing vulnerability to antibiotics. The bacterial cell wall, made of a polymer called peptidoglycan, is essential for survival and is a common target of antibiotics.
The team identified an enzyme, Peptidoglycan Editing Factor (PgeF), that acts as a molecular editor by detecting and removing these misincorporated amino acids. 'Using advanced genetics and high-resolution mass spectrometry, we showed that PgeF ensures cell wall strength by maintaining its correct composition,' said Dr Shambhavi Garde, the study's first author.
Significantly, the team also found a human homologue of this enzyme, known as LACC1, which is linked to several autoinflammatory disorders, conditions in which the immune system becomes overactive. Though LACC1's exact function remains unclear, this research suggests a possible role in how the body responds to bacterial infections.
'This discovery not only opens new avenues for targeting bacterial vulnerabilities but also hints at shared mechanisms between microbial and human biology,' said Dr Manjula. 'Fundamental studies like this can drive novel strategies for both antimicrobial therapies and immune regulation.'
