Ada Yonath, Israel’s first female Nobel laureate in chemistry, passed away on August 31, 2026, at the age of 87. Celebrated for her groundbreaking work on the structure of ribosomes, Yonath’s contributions fundamentally advanced understanding of protein synthesis and antibiotic function.
Born Ada Esther Lifshitz on June 22, 1939, in Jerusalem under British Mandatory Palestine, Yonath grew up in a modest household marked by early personal losses and financial challenges. After her father’s death when she was 11, the family relocated to Tel Aviv, where she developed a keen interest in science. She pursued her studies at the Hebrew University of Jerusalem, earning a bachelor’s degree in chemistry in 1962 and a master’s in biochemistry in 1964, followed by doctoral research at the Weizmann Institute of Science.
Yonath’s scientific career was characterized by persistence in the face of skepticism from the broader community. At a time when the inner workings of the ribosome—cellular structures that translate genetic information into proteins—remained elusive, many experts believed they could not be crystallized due to their irregular shapes and instability. This view deterred prominent researchers, including Nobel laureate James Watson. Undeterred, Yonath proposed a novel approach, inspired in part by an article she encountered while recovering from a bicycle accident, which described ribosomal behavior in polar bears during hibernation.
Her insight led Yonath to focus on ribosomes sourced from organisms living in extreme environments, such as bacteria near the Dead Sea. After thousands of experiments, including ribosome samples flown on space missions, she succeeded in crystallizing ribosomes in 1980 using a thermophilic bacterium. Her development of cryo bio-crystallography—a technique involving freezing crystals to prevent damage during X-ray analysis—allowed her to map ribosomal structure in three dimensions by 2001.
Yonath’s work revealed unexpected features of the ribosome, including the symmetrical nature of its active site, a discovery that initially faced disbelief within the scientific community. Understanding ribosome structure also illuminated how antibiotics target bacterial ribosomes, paving the way for rational drug design and addressing antibiotic resistance.
In 2009, Yonath shared the Nobel Prize in Chemistry with two other researchers in recognition of their collective achievement in ribosome research. She was only the fourth woman to receive the prize in chemistry and the first female Israeli laureate in any category.
Throughout her career, Yonath split her research time between Israel’s Weizmann Institute and Germany’s Max Planck Institute, where she held leadership roles. She was a vocal advocate for open scientific collaboration, challenging proprietary approaches by openly sharing methods and data prior to publication.
Despite gaining international acclaim, Yonath remained dedicated to research well into her later years, expressing ongoing curiosity about the origins of life and the proto-ribosome. Her legacy includes not only significant scientific breakthroughs but also her steadfast commitment to scientific openness and mentorship.
Yonath is survived by her daughter, Hagith, a physician and medical director.