James B. Sumner
American chemist (1887-1955)
United StatesSummary
Updated 2026-05-29
Biochemist who crystallized enzymes and proved they're proteins—work that landed him a 1946 Nobel Prize in Chemistry. He cracked something fundamental about how life's molecular machinery actually works.
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James Batcheller Sumner was an American biochemist. He discovered that enzymes can be crystallized, for which he shared the Nobel Prize in Chemistry in 1946 with John Howard Northrop and Wendell Meredith Stanley. He was also the first to prove that enzymes are proteins.
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