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We immunized rabbits with purified guanine nucleotide-binding proteins (G proteins) from bovine brain and obtained an antiserum, RV3, that reacts specifically with the alpha subunit (39 kDa) of a G protein of unknown function, termed Go, as well as with the beta subunit (35 kDa) common to all G proteins. RV3 showed no crossreactivity with the alpha subunits of the stimulatory (Gs) or inhibitory (Gi) G proteins associated with adenylate cyclase, nor with that of the rod outer segment G protein, transducin. Immunoblots with crude and affinity-purified antiserum showed that RV3 specifically recognizes the Go alpha subunit and the beta subunit in crude brain membranes. Using RV3, we found approximately equal amounts of Go in brain membranes from frog, chicken, rat, cow, and man. Quantitative immunoblotting gave Go alpha subunit/ beta subunit ratios approximately equal to 1 in cerebral cortex, raising the possibility that free Go alpha subunit (unassociated with beta subunit) may exist in brain. The concentration of Go alpha subunit in cortex is about 5 times that of Gi alpha subunit. The results show that Go is an immunochemically distinct, highly conserved protein distributed throughout the brain, with particularly high concentrations in forebrain.

Use of specific antibodies to quantitate the guanine nucleotide-binding protein Go in brain.