<P> G proteins , also known as guanine nucleotide - binding proteins , are a family of proteins that act as molecular switches inside cells , and are involved in transmitting signals from a variety of stimuli outside a cell to its interior . Their activity is regulated by factors that control their ability to bind to and hydrolyze guanosine triphosphate ( GTP ) to guanosine diphosphate ( GDP ) . When they are bound to GTP , they are ' on ' , and , when they are bound to GDP , they are ' off ' . G proteins belong to the larger group of enzymes called GTPases . </P>
<P> G proteins , also known as guanine nucleotide - binding proteins , are a family of proteins that act as molecular switches inside cells , and are involved in transmitting signals from a variety of stimuli outside a cell to its interior . Their activity is regulated by factors that control their ability to bind to and hydrolyze guanosine triphosphate ( GTP ) to guanosine diphosphate ( GDP ) . When they are bound to GTP , they are ' on ' , and , when they are bound to GDP , they are ' off ' . G proteins belong to the larger group of enzymes called GTPases . </P>
name the two types of proteins that regulate the cell cycle . how do these proteins work
name the two types of proteins that regulate the cell cycle . how do these proteins work
G proteins , also known as guanine nucleotide - binding proteins their ability to bind to and hydrolyze guanosine triphosphate ( GTP ) to guanosine diphosphate ( GDP )
G proteins , also known as guanine nucleotide - binding proteins their ability to bind to and hydrolyze guanosine triphosphate ( GTP ) to guanosine diphosphate ( GDP )