In 1926 American chemist James Batcheller Sumner (19th November, 1887 - 12th August, 1955) proved that an enzyme is a protein by crystallizing and isolating the enzyme urease, despite doubts within the scientific community over whether his experiment would be successful. In 1946 he received the Nobel Prize for Chemistry.
James Sumner shows that the urease enzyme is a protein (46 words)
Historical Context Note
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