This is a Ph.D. dissertation. Reversible protein phosphorylation has become widely recognized as the most important reaction for the regulation of protein functioning in eukaryotic cells, being involved in switching cellular activities from one state to another and, in this way, regulating different cellular functions.
It is the major mechanism by which cells respond to extracellular signals, such as hormones and growth factors, and control all events at various stages of the cell cycle, as well as the response of the cell to environmental and nutritional stresses. As much as one-third of cellular proteins have been estimated to undergo reversible protein phosphorylation, underlining the importance, and widespread occurrence of this modification.
Contents include: General Introduction, Protein Phosphates, Multimetric Structure of PP2A, PP2A as a Kinase Phosphate, Aims of the Work, Materials and Methods, Results, B'/PR61-Interacting Proteins, Discussion.