Question

The role of protein phosphatases in the cell is to



a. hydrolyze atp and gtp to adp and gdp



b. remove phosphoryl groups from proteins



c. transfer phosphoryl groups from atp to target proteins



d. activate pi-3-kinase



e. none of the above

Answer 1

A protein kinase is a kinase enzyme that modifies other proteins by chemically adding phosphate groups to them (phosphorylation). Phosphorylation usually results in a functional change of the target protein (substrate) by changing enzyme activity, cellular location, or association with other proteins