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Pubmed ID :2509464
Publication Date : //

Immunological and molecular characterization of Go alpha-like proteins in the Drosophila central nervous system.


The alpha subunits of heterotrimeric G proteins are responsible for the coupling of receptors for a wide variety of stimuli to a number of intracellular effector systems. In the nervous system of vertebrates, high levels of a specific class of G protein (Go alpha) are expressed. The alpha subunit of Go serves as a substrate for modification by pertussis toxin (PTX). In this report, we demonstrate that the Drosophila heads contain high levels of a 40-kDa PTX substrate. Modification of this protein by PTX is modulated in a manner similar to that observed for vertebrate G proteins. The PTX substrate in Drosophila is also recognized specifically by antibodies raised against peptide sequences found specifically in vertebrate Go alpha. Vertebrate Go alpha probes were used to identify a Drosophila cDNA coding for a potential PTX substrate with high sequence identity (82%) to vertebrate Go alpha. An additional cDNA coding for a related Go alpha has also been isolated. The two cDNAs differ only in the 5'-untranslated and amino-terminal regions of the protein. This observation, in addition to Northern analysis, suggests that alternate splicing may generate a variety of Go alpha-like proteins in Drosophila. In situ hybridization of specific probes to tissue sections indicates that the mRNAs coding for Go alpha-like proteins in Drosophila are expressed primarily in neuronal cell bodies and, at lower levels, in the eyes.

Authors : Thambi N C , Quan F , Wolfgang W J , Spiegel A , Forte M ,

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