Efficient signal transduction by a chimeric yeast-mammalian G protein alpha subunit Gpa1-Gs alpha covalently fused to the yeast receptor Ste2

Efficient signal transduction by a chimeric yeast-mammalian G protein alpha subunit Gpa1-Gs alpha covalently fused to the yeast receptor Ste2

Saccharomyces cerevisiae uses G protein‐coupled receptors for signal transduction. We show that a fusion protein between the α‐factor receptor (Ste2) and the Gα subunit (Gpa1) transduces the signal efficiently in yeast cells devoid of the endogeneous STE2 and GPA1 genes. To evaluate the function of...

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Bibliographic Details
Published in:The EMBO journal Vol. 16; no. 24; pp. 7241 - 7249
Main Authors: Medici, R, Bianchi, E, De Segni, G, Tocchini-Valentini, G.P
Format: Journal Article
Language:English
Published: Chichester, UK John Wiley & Sons, Ltd 15-12-1997
Subjects:
alpha-factor
beta-galactosidase
binding
binding proteins
chimeric Gα subunit
deletions
fus1 promoter
gene expression
genetic complementation
genetic transformation
Gpa1
gpa1 gene
growth
Gsα
guanosine triphosphate
Gα C-terminus
haploidy
molecular conformation
pheromones
promoter regions
rats
receptor-Gα fusion protein
receptors
recombinant proteins
reporter genes
Saccharomyces cerevisiae
structural genes
viability
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Summary:Saccharomyces cerevisiae uses G protein‐coupled receptors for signal transduction. We show that a fusion protein between the α‐factor receptor (Ste2) and the Gα subunit (Gpa1) transduces the signal efficiently in yeast cells devoid of the endogeneous STE2 and GPA1 genes. To evaluate the function of different domains of Gα, a chimera between the N‐terminal region of yeast Gpa1 and the C‐terminal region of rat Gsα has been constructed. This chimeric Gpa1–Gsα is capable of restoring viability to haploid gpa1Δ cells, but signal transduction is prevented. This is consistent with evidence showing that the C‐terminus of the homologous Gα is required for receptor–G protein recognition. Surprisingly, a fusion protein between Ste2 and Gpa1–Gsα is able to transduce the signal efficiently. It appears, therefore, that the C‐terminus of Gα is mainly responsible for bringing the G protein into the close proximity of the receptor's intracellular domains, thus ensuring efficient coupling, rather than having a particular role in transmitting the signal. To confirm this conclusion, we show that two proteins interacting with each other (such as Snf1 and Snf4, or Ras and Raf), each of them fused either to the receptor or to the chimeric Gα, allow efficient signal transduction.
Bibliography:ArticleID:EMBJ7590691
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ObjectType-Article-2
SourceType-Scholarly Journals-1
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content type line 23
ISSN:0261-4189
1460-2075
DOI:10.1093/emboj/16.24.7241