Structure and Function of G-Protein βγ Subunit

G Proteins ◽  
1990 ◽  
pp. 41-61 ◽  
Author(s):  
Eva J. Neer ◽  
David E. Clapham
Keyword(s):  
G Protein ◽  
Structure And Function ◽  
And Function

Mutations Probe Structure and Function of G-protein   Chains

1988 ◽  
Vol 53 (0) ◽  
pp. 221-228 ◽  
Author(s):  
H.R. Bourne ◽  
S.B. Masters ◽  
R.T. Miller ◽  
K.A. Sullivan ◽  
W. Heideman
Keyword(s):  
G Protein ◽  
Structure And Function ◽  
And Function

scholarly journals Combinatorial phosphorylation modulates the structure and function of the G protein γ subunit in yeast

2021 ◽  
Vol 14 (688) ◽  
pp. eabd2464
Author(s):  
Zahra Nassiri Toosi ◽  
Xinya Su ◽  
Ruth Austin ◽  
Shilpa Choudhury ◽  
Wei Li ◽  
...  
Keyword(s):  
G Protein ◽  
Posttranslational Modifications ◽  
Intrinsically Disordered Proteins ◽  
Structure And Function ◽  
Disordered Proteins ◽  
Intrinsically Disordered ◽  
Intrinsically Disordered Regions ◽  
Gpcr Activation ◽  
Essential Components ◽  
And Function

Intrinsically disordered regions (IDRs) in proteins are often targets of combinatorial posttranslational modifications, which serve to regulate protein structure and function. Emerging evidence suggests that the N-terminal tails of G protein γ subunits, which are essential components of heterotrimeric G proteins, are intrinsically disordered, phosphorylation-dependent determinants of G protein signaling. Here, we found that the yeast Gγ subunit Ste18 underwent combinatorial, multisite phosphorylation events within its N-terminal IDR. G protein–coupled receptor (GPCR) activation and osmotic stress induced phosphorylation at Ser7, whereas glucose and acid stress induced phosphorylation at Ser3, which was a quantitative indicator of intracellular pH. Each site was phosphorylated by a distinct set of kinases, and phosphorylation of one site affected phosphorylation of the other, as determined through exposure to serial stimuli and through phosphosite mutagenesis. Last, we showed that phosphorylation resulted in changes in IDR structure and that different combinations of phosphorylation events modulated the activation rate and amplitude of the downstream mitogen-activated protein kinase Fus3. These data place Gγ subunits among intrinsically disordered proteins that undergo combinatorial posttranslational modifications that govern signaling pathway output.

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