John Howard Northrop

From Wikipedia, the free encyclopedia

John Howard Northrop
Born	June 5, 1891(1891-06-05) Yonkers, United States
Died	May 27, 1987 (aged 95) Wickenburg, Arizona, United States
Institutions	Columbia University
Doctoral advisor	Jacques Loeb
Notable awards	Nobel Prize in Chemistry (1946)

John Howard Northrop (July 5, 1891 – May 27, 1987) was an American biochemist who won the Nobel Prize in Chemistry in 1946 (with James Batcheller Sumner and Wendell Meredith Stanley) for purifying and crystallizing certain enzymes.

1 Early life
2 Work
3 Later life
4 External links

[edit] Early life

Northrop was born in Yonkers, New York. His father, a trained zoologist, died in a lab explosion two weeks before John was born. He was educated at Columbia University, where he earned his PhD in chemistry in 1915. During World War I, he conducted research for the U.S. Army Chemical Warfare Service on the production of acetone and ethanol through fermentation. This work led to studying enzymes.

[edit] Work

In 1929, he isolated and crystallized the gastric enzyme pepsin and determined that it was a protein and in 1938 he isolated and crystallized the first bacteriophage (a small virus that attacks bacteria), and determined that it was a nucleoprotein. Northrop also isolated and crystallized pepsinogen (the precursor to pepsin), trypsin, chymotrypsin, and carboxypeptidase.

His 1939 book, Crystalline Enzymes, was an important text. Northrop was employed by the Rockefeller Institute for Medical Research in New York City from 1916 to 1961, at which time he retired. Northrop died in Wickenburg, Arizona.

His daughter Alice married Frederick C. Robbins, who was awarded Nobel Prize in Physiology or Medicine in 1954.