(A) GTP binding and hydrolysis (left) by purified wild-type Gαo equilibrated in BODIPY-GTP, without (middle) and with (right) normalization.
(B) BODIPY-GTP binding and hydrolysis by purified group 1 variants, without (top) and with (bottom) detectable catalytic activity.
(C) BODIPY-GTP binding and hydrolysis by purified group 2 variants, with wild-type-like (top) and with slow (bottom) rates of hydrolysis.
(D) BODIPY-GTP binding and hydrolysis by purified group 3 variants.
(E) BODIPY-GTP binding and hydrolysis by purified group 4 variants. Data are representative of six measurements from two independent purifications. See Data S3.