Our City Desk
Researchers at CSIR-Centre for Cellular and Molecular Biology have uncovered a remarkable defense strategy used by plants to combat viral infections, shedding light on how plants deploy “sticky” molecular traps to immobilize invading viruses before they can multiply.
The groundbreaking study, led by scientist Dr. Mandar V. Deshmukh and published in the prestigious Journal of the American Chemical Society (JACS), reveals the molecular mechanism behind this natural antiviral response — a discovery that could pave the way for stronger virus-resistant crops and even new medical therapies in humans.
Plants are constantly exposed to viruses, many of which carry their genetic information in the form of double-stranded RNA. When attacked, plants respond by producing specialized molecules known as RNA-binding proteins. These proteins identify viral RNA and move toward structures called Viral Replication Complexes — the sites where viruses reproduce inside cells.
Scientists have long known that these proteins interfere with viral replication, effectively stopping viruses from multiplying. However, precisely how the proteins captured and immobilized viral RNA had remained a mystery until now.
Traditionally, researchers believed RNA-binding proteins worked through a straightforward “lock-and-key” interaction, where proteins simply attached themselves to viral RNA. But the CCMB team discovered the process is far more sophisticated.
Using advanced techniques such as Nuclear Magnetic Resonance (NMR) spectroscopy, fluorescence microscopy, and molecular dynamics simulations, the researchers identified a unique structural arrangement in these RNA-binding proteins. The proteins possess specially organized electric charges on their surfaces, creating highly “sticky” patches.
These charged regions attract one another and allow the proteins to assemble into interconnected networks, forming dense, gel-like droplets inside plant cells.
“These proteins act like molecular glue,” explained Dr. Jaydeep Paul, the study’s first author. “By forming dense, gel-like droplets, the plant cells effectively trap the viral RNA, preventing it from interacting with the machinery required for replication.”
The droplets, known scientifically as biomolecular condensates, are increasingly transforming scientists’ understanding of how cells function. Rather than being viewed merely as collections of static membrane-bound compartments such as nuclei or mitochondria, cells are now understood to contain highly dynamic, liquid-like structures that can rapidly assemble and disassemble when needed.
Dr. Deshmukh said the findings highlight the growing importance of membraneless organelles in biology.
“These condensates behave much like oil droplets in water,” he noted. “Understanding these dynamic states has major implications not only for fundamental biology but also for agricultural and medical biotechnology.”
The implications for agriculture could be enormous. Viral plant diseases cause billions of dollars in crop losses globally each year. By enhancing or mimicking these naturally occurring protein traps, scientists may eventually engineer crop varieties with stronger built-in resistance against destructive viral outbreaks.
Beyond agriculture, the discovery may also have significant biomedical applications. Similar sticky protein assemblies exist in human cells and are linked to several diseases. Researchers believe understanding how these molecular condensates form and dissolve could help scientists tackle neurodegenerative disorders such as dementia, where toxic protein clumps accumulate in the brain.
The findings may also aid cancer research by helping scientists dismantle protective liquid-like barriers that shield growing tumors from the body’s immune defenses and medical treatments.
Importantly, the study opens possibilities for designing precision drugs capable of manipulating these sticky protein interactions in highly targeted ways.
The research marks another significant contribution from Hyderabad-based CSIR-Centre for Cellular and Molecular Biology, reinforcing India’s growing role in cutting-edge molecular and cellular biology research with global scientific and agricultural relevance.
