G proteins

G proteins: These molecules have been described as ôbiological traffic lights.ö Located inside the cell, G proteins are able respond to signals outside the cellùlight, smell, hormonesùand translate (transduce) these signals into action within the cell. Alfred G. Gilman and Martin Rodbell shared the 1994 Nobel Prize in Physiology or Medicine for ôtheir discovery of G- proteins and the role of these proteins in signal transduction in cells.ö