Ada Yonath

Lore & Background

Yonath accepted postdoctoral positions at Carnegie Mellon University (1969) and MIT (1970). At MIT, she spent time in the laboratory of William N. Lipscomb, Jr. at Harvard, which inspired her to pursue very large structures. In 1970, she established what was for nearly a decade the only protein crystallography laboratory in Israel. From 1979 to 1984 she was a group leader with Heinz-Günter Wittmann at the Max Planck Institute for Molecular Genetics in Berlin. She was a visiting professor at the University of Chicago in 1977–78. She headed a Max-Planck Institute Research Unit at DESY in Hamburg, Germany (1986–2004) in parallel to her research at the Weizmann Institute. She pioneered ribosomal crystallography over 20 years despite skepticism. In 1993, she visualized the ribosomal tunnel. In 2000 and 2001, she determined the complete high-resolution structures of both ribosomal subunits and discovered a universal symmetrical region, showing the ribosome is a ribozyme. She elucidated the modes of action of over twenty antibiotics targeting the ribosome, illuminated drug resistance and synergism, and introduced cryo bio-crystallography.

Reader's Guide

Ada Yonath's significance lies in her pioneering work on the structure of ribosomes, which are cellular machines that translate RNA into protein. Her use of X-ray crystallography to determine the high-resolution structures of both ribosomal subunits in 2000 and 2001 was a breakthrough, revealing that the ribosome is a ribozyme—an RNA-based catalyst. This work had immediate practical consequences: by elucidating the modes of action of over twenty antibiotics, she provided the structural basis for drug selectivity and resistance, paving the way for structure-based drug design. Her introduction of cryo bio-crystallography became a routine technique in structural biology. As the first Israeli woman to win a Nobel Prize (2009) and the first woman from the Middle East to win a Nobel in the sciences, her award was noted as a highlight for female scientists, 'crushing the lab's glass ceiling' according to The Australian. Her legacy includes establishing the first protein crystallography laboratory in Israel and being recognized by UNESCO for her key role in understanding how antibiotics work. President Isaac Herzog called her 'one of the leading researchers in the history of Israeli science.'

Did You Know?

• She introduced cryo bio-crystallography, which became routine in structural biology.
• Her father was a rabbi who died when she was young, after which she helped support the family by babysitting and tutoring.
• She was awarded the Israel Prize in 2002 and the Wolf Prize in Chemistry in 2006.

From a Jerusalem Grocery to the Weizmann Institute

Ada Esther Lifshitz entered the world on 22 June 1939 in the Geula quarter of Jerusalem, the daughter of Hillel and Esther Lifshitz, a rabbinical family that had emigrated from Zduńska Wola, Poland, in 1933. Her father, a rabbi by lineage, ran a small grocery while the family crammed into a modest apartment and struggled to make ends meet. Yet her parents insisted on enrolling her in a school in the more affluent Beit HaKerem neighborhood, a decision that would shape everything to come. When Hillel died at just forty-two, the family relocated to Tel Aviv, and young Ada pitched in by babysitting and tutoring neighborhood children to supplement her mother's income. At Tichon Hadash high school, her mother could not cover the tuition, so Ada bartered her own mathematics lessons to other students in exchange for a seat. A childhood fascination with Marie Curie's biography sparked her scientific curiosity, though she later clarified that Curie inspired rather than served as a strict role model. She returned to Jerusalem for university, earning a bachelor's in chemistry from the Hebrew University in 1962 and a master's in biochemistry in 1964 before completing her doctorate at the Weizmann Institute in 1968, where Wolfie Traub guided her X-ray crystallographic work on collagen.

Pioneering Ribosomal Crystallography

Yonath's career arc began with postdoctoral positions at Carnegie Mellon and MIT in the early 1970s. A stint in the Harvard laboratory of William N. Lipscomb Jr., the 1976 chemistry Nobel laureate, during her MIT years, stoked her desire to attack very large molecular structures. In 1970 she founded what would remain, for nearly a decade, the only protein crystallography laboratory in Israel. Her subsequent appointments included a visiting professorship at the University of Chicago, a group-leadership role alongside Heinz-Günter Wittmann at the Max Planck Institute for Molecular Genetics in Berlin, and a Max-Planck Research Unit at DESY in Hamburg that she directed from 1986 to 2004, all while anchoring her work at the Weizmann Institute. Her defining obsession was the ribosome. Against considerable skepticism from the broader scientific community, she pursued ribosomal crystallography for over twenty years. In 1993 she visualized the ribosomal tunnel through which nascent proteins travel, and in 2000–2001 she determined the complete high-resolution structures of both subunits, uncovering a universal symmetrical region within the otherwise asymmetric molecule and proving the ribosome acts as a ribozyme. She further elucidated the action of more than twenty antibiotics targeting the ribosome, illuminated drug-resistance mechanisms, and introduced cryo bio-crystallography, a method that became routine across structural biology.

A Historic Nobel and the Breaking of Barriers

In 2009, Ada Yonath shared the Nobel Prize in Chemistry with Venkatraman Ramakrishnan and Thomas A. Steitz for their collective studies on the structure and function of the ribosome. The award made her the first Israeli woman ever to receive a Nobel Prize—she was the only female among Israel's ten Nobel laureates at that time. She also became the first woman from the Middle East to claim a Nobel in the sciences and the first woman in forty-five years to take home the chemistry prize. At the Weizmann Institute she held the Martin S. and Helen Kimmel Professorial Chair and directed the Helen and Milton A. Kimmelman Center for Biomolecular Structure and Assembly. The Australian newspaper described her win as "crushing the lab's glass ceiling," and the moment was widely celebrated as a watershed for women in science. For Yonath, the recognition validated two decades of stubborn, often ridiculed work on a molecule that most of the field had deemed too large and too complex to resolve by crystallography. The Nobel committee's citation underscored that her structural maps of the ribosome were not merely academic curiosities but practical blueprints that would reshape how antibiotics are designed and how drug resistance is understood.

Personal Life, Death, and Enduring Legacy

Yonath was married to Moshe Yonath; the marriage ultimately ended in divorce. They had one daughter, Hagit Yonath, who became a doctor at Sheba Medical Center, and a granddaughter, Noa. She was also the cousin of Ruchama Marton, an anti-occupation activist. Ada Yonath passed away on 31 August 2026, at the age of eighty-seven. In the years before her death, her influence continued to ripple outward. In 2018, UNESCO highlighted that her research had been "key to understanding how antibiotics work." After her passing, The New York Times observed that her mapping of the ribosome had led to new antibiotic designs and called her work "boundary pushing" with "immediate and practical consequences" for medicine and the fight against infectious disease. President Isaac Herzog hailed her as "one of the leading researchers in the history of Israeli science," while The Hindu pointed to her academic reach, particularly her engagements in India. Her legacy is inseparable from the institution she helped build: the first protein crystallography laboratory in Israel, a foundation upon which an entire generation of structural biologists would construct their careers.