James Sumner shows that the urease enzyme is a protein (46 words)

Historical Context Note

Context

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.