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A polyclonal rabbit antibody (9120) against the alpha subunit of the "other" guanine nucleotide-binding protein Go (alpha o) was raised against a synthetic alpha o peptide fragment (Asp-Gly-Ile-Ser-Ala-Ala-Lys-Asp-Val) attached to a branched core system. Antiserum 9120, at a final dilution of 1:400, can detect alpha o in as little as 0.2 microgram of Go on immunoblots, and, at a final dilution of 1:20,000, can detect alpha o in 1 microgram of Go on immunoblots. Antiserum and affinity-purified antibody are specific to alpha o. No cross-reactivity was detected to the alpha subunits of the stimulatory or inhibitory guanine nucleotide-binding regulatory proteins or of transducin (alpha s, alpha i, or alpha T) or to the beta or gamma subunits. Immunoblots revealed a high density of alpha o in rat brain and lung membrane preparations, but other tissues (such as adipose tissue, heart, erythrocytes, and liver) have no detectable alpha o. Developmental studies showed that alpha o in rat brain was low before birth, increased after birth, and reached the full adult level at 4 weeks of age. In contrast, ADP-ribosylation of 40-kDa proteins increased for up to 1 week and then decreased. Immunocytochemistry revealed that alpha o was localized to somatic and synaptic membranes in rat brain, whereas little or no alpha o was detected in the cytoplasm of neuronal cell bodies. Our observations suggest that Go in brain might have a role in membrane signal transduction at synaptic and extrasynaptic sites.

proceedings of the national academy of sciences of the united states of america

Antibody specific to the alpha subunit of the guanine nucleotide-binding regulatory protein Go: developmental appearance and immunocytochemical localization in brain.