Table 4. Rates of steady state GTP hydrolysis.

	Minus RGS	Plus RGS
AtGPA1	0.025±0.005	0.503±0.086
AtGPA1 T194N	0.031±0.005	0.158±0.019
OsRGA1	0.019±0.004	0.127±0.016
OsRGA1 N195T	0.031±0.006	0.288±0.029
MpGα1	1.06±0.08	1.13±0.12

Steady state GTP hydrolysis [min⁻¹]. Steady-state [γ-³²P]GTP hydrolysis was measured as described in Figure 7 at 20°C and reported as min⁻¹.