Frederick Sanger

Overview

Frederick Sanger (August 13, 1918 – November 19, 2013) was an English biochemist whose work transformed both protein and nucleic acid chemistry. He is one of only four two-time Nobel laureates, winning the Chemistry Prize in 1958 for sequencing insulin and again in 1980, with Walter Gilbert, for developing methods for determining the nucleotide sequence of DNA.

Sanger's insulin sequence was the first complete primary structure of any protein. By establishing that a protein has a defined, reproducible sequence of amino acids, Sanger provided the experimental foundation for the concept that proteins encode biological function in their primary structure — a proposition that, at the time, was still debated.

His DNA-sequencing method, published in 1977 and now known as "Sanger sequencing" or "dideoxy termination" sequencing, remained the backbone of genome analysis for decades and was the method used to generate the initial human genome sequence. The Sanger Institute near Cambridge, England, was founded in part to carry forward large-scale sequencing efforts and was named in his honor.

Background

Sanger was born in Rendcomb, Gloucestershire, into a Quaker family. He studied natural sciences at St. John's College, Cambridge, graduating in 1939, and completed his Ph.D. in 1943 at Cambridge under Albert Neuberger. Throughout his career, he remained at Cambridge, working primarily at the Medical Research Council Laboratory of Molecular Biology after its establishment in 1962.

His scientific approach was notable for its methodical patience. Sequencing insulin required developing chemical reagents (the "Sanger reagent," 2,4-dinitrofluorobenzene), partial hydrolysis methods, and careful chromatographic separations, and took over a decade. Similarly, DNA sequencing required exploring many enzymatic and chemical approaches before the dideoxy method emerged.

Key Contributions

• First complete protein sequence (insulin, 1955).
• Development of the Sanger reagent for N-terminal amino acid labeling.
• Dideoxy DNA sequencing method (1977) that made large-scale genome sequencing practical.
• Two Nobel Prizes in Chemistry (1958 and 1980).
• Indirect influence on molecular biology through training of notable students.

Timeline

• 1918: Born in Rendcomb, Gloucestershire.
• 1943: Ph.D. from Cambridge.
• 1951–1955: Publishes the complete sequence of insulin in stages.
• 1958: First Nobel Prize in Chemistry.
• 1977: Publishes the dideoxy DNA sequencing method.
• 1980: Second Nobel Prize in Chemistry, shared with Walter Gilbert and Paul Berg.
• 1983: Retires from active research.
• 2013: Dies at age 95.

Modern Relevance

Sanger's influence extends through the entire edifice of modern molecular biology. Protein sequencing by Edman degradation and later by mass spectrometry descends conceptually from his insulin work. DNA sequencing, from early individual-gene projects to whole-genome efforts, rests on the Sanger method (and its successors). The Wellcome Sanger Institute continues to be a major node in international genomics.

On the peptide side, Sanger's framework made later structure-activity studies possible. Once one knows the primary structure of a hormone such as insulin, glucagon, or ACTH, rational modification of individual residues becomes feasible, and the dominant strategy of modern peptide drug design — modifying natural sequences to improve properties — becomes a research program. For the broader history, see insulin-structure-solved.

Related Compounds

• Insulin
• Glucagon
• C-peptide
• Proinsulin
• Somatostatin