Overview
Tim Hunt was awarded the 2001 Nobel Prize in Physiology or Medicine with Paul Nurse and Leland H. Hartwell for their discoveries of protein molecules that control the division (duplication) of cells.
When cells with nuclei divide, they divide in phases called G1 (growth), S (synthesis), G2 (growth), and M (mitosis). Nurse, Hartwell and Hunt together discovered two proteins, cyclin and CDK (cyclin dependent kinase), that control the transition from one stage to another.
Working in sea urchin eggs, Hunt discovered cyclins, proteins that bind to cyclin dependent kinase (CDK) proteins and regulate their activity. Cyclins and CDKs turn other cell cycle proteins on and off by adding or removing phosphate groups.
Read more about this topic: Tim Hunt