Aaron Klug

Aaron Klug was a Lithuanian-born British biophysicist and chemist whose pioneering development of crystallographic electron microscopy revolutionized the study of biological structures. His work provided fundamental insights into the architecture of chromatin, viruses, and proteins, most famously leading to the discovery of zinc finger transcription factors. For these contributions, he was awarded the Nobel Prize in Chemistry in 1982 and later received the Copley Medal and the Order of Merit.

Early life and education

Born in Želva, his family emigrated to South Africa when he was a child, where he later attended the University of the Witwatersrand in Johannesburg, initially studying medicine. He soon switched to physics, completing a Bachelor of Science before moving to the University of Cape Town for a Master of Science in crystallography. In 1949, he moved to England as a 1851 Exhibition Scholar, undertaking doctoral research at the University of Cambridge under the supervision of Douglas Hartree at Trinity College. His early work involved applying X-ray diffraction techniques to the study of steel, laying a foundation for his later biological applications.

Career and research

After his PhD, Klug worked briefly at the University of London before joining Rosalind Franklin at Birkbeck College in 1954, where he began studying the structure of the tobacco mosaic virus. Following Franklin's death, he moved in 1962 to the newly established MRC Laboratory of Molecular Biology in Cambridge, where he would spend the remainder of his career, eventually becoming its director from 1986 to 1996. At the MRC Laboratory of Molecular Biology, his laboratory became a world center for structural biology, attracting collaborators like John Finch and Timothy Richmond. His research program focused on developing novel methods to visualize complex biological assemblies that defied traditional X-ray crystallography.

Contributions to structural biology

Klug's most significant contribution was the invention and refinement of crystallographic electron microscopy, a technique combining electron microscopy with image processing and diffraction theory to determine three-dimensional structures. He applied this method to solve the intricate architecture of spherical viruses like tomato bushy stunt virus and human common cold viruses. His group's analysis of chromatin revealed its fundamental repeating subunit, the nucleosome, a discovery critical for understanding gene regulation. In the late 1970s, work in his lab on the Xenopus transcription factor TFIIIA led to the landmark discovery of zinc finger protein domains, a ubiquitous DNA-binding domain essential for eukaryotic gene expression.

Awards and honors

Klug received numerous prestigious awards for his scientific achievements. He was elected a Fellow of the Royal Society in 1969 and served as its President from 1995 to 2000. The pinnacle of his recognition was the 1982 Nobel Prize in Chemistry, awarded for his development of crystallographic electron microscopy and his structural elucidation of biologically important nucleic acid-protein complexes. Other major honors included the Copley Medal of the Royal Society in 1985, the Order of Merit in 1995, and the Lomonosov Gold Medal in 2005. He was knighted in 1988, becoming Sir Aaron Klug, and held honorary degrees from many universities, including Harvard University and the Weizmann Institute of Science.

Personal life and legacy

He married Liebe Bobrow in 1948, and they had two sons. Known for his modest demeanor and intellectual rigor, he was a keen photographer and had a deep interest in the history of science. His legacy endures through the widespread use of the techniques he pioneered, which became standard in structural biology and virology. The discovery of zinc fingers spawned an entire field of research and enabled technologies like zinc finger nucleases for genome editing. He died in Cambridge in 2018, remembered as a central figure in the molecular biology revolution whose methodological innovations opened new windows into the machinery of life.

Category:British biophysicists Category:Nobel laureates in Chemistry Category:Fellows of the Royal Society Category:Recipients of the Order of Merit