Enzyme crystallization confirmed

Sumner had crystallized the obscure enzyme urease and showed that it was a protein, but his generalized findings flew in the face of more established biochemists like Willstatter. Crystallizing the enzyme pepsin confirmed it as a protein and paved the way for further crystallization of other enzymes. This breakthrough was instrumental in biochemical research.
 John Howard Northrop United States 1930 Enzyme crystallization confirmed

Sumner had crystallized the obscure enzyme urease and showed that it was a protein, but his generalized findings flew in the face of more established biochemists like Willstatter. Crystallizing the enzyme pepsin confirmed it as a protein and paved the way for further crystallization of other enzymes. This breakthrough was instrumental in biochemical research.