Only human GPCRs and human Gα subunits were used in this study. An open reading frame of each full-length GPCR was cloned into pcDNA3.1(+) expression plasmid. Except when otherwise specified, GPCRs sequences were devoid of epitope tags.
Gα
s-67-RlucII (Carr et al., 2014 (
link)), Gα
i1-loop-RlucII and GFP10-Gγ
1 (Armando et al., 2014 (
link)), Gα
i2-loop-RlucII and βarrestin2-RlucII (Quoyer et al., 2013 (
link)), Gα
oB-99-RlucII (Mende et al., 2018 (
link)), Gα
q-118-RlucII (Breton et al., 2010 (
link)), Gα
12-136-RlucII and PKN-RBD-RlucII (Namkung et al., 2018 (
link)), Gα
13-130-RlucII (Avet et al., 2020 (
link)), GFP10-Gγ
2 (Galés et al., 2006 (
link)), βarrestin1-RlucII (Zimmerman et al., 2012 (
link)), rGFP-CAAX (Namkung et al., 2016 (
link)), EPAC (Leduc et al., 2009 (
link)), MyrPB-Ezrin-RlucII (Leguay et al., 2021 (
link)), HA-β
2AR (Lavoie et al., 2002 (
link)), signal peptide-Flag-AT
1 (Goupil et al., 2015 (
link)), and EAAC-1 (Brabet et al., 1998 (
link)) were previously described. Full-length, untagged Gα subunits, Gβ
1 and Gγ
9 were purchased from cDNA Resource Center. GRK2 was generously provided by Dr. Antonio De Blasi (Istituto Neurologico Mediterraneo Neuromed, Pozzilli, Italy).
To selectively detect G
i/o activation, a construct coding for aa 1–442 of Rap1 GTPase-activating protein (comprising a G
i/o binding domain) fused to Rluc8, was sequence-optimized, synthetized and subcloned at TopGenetech (St-Laurent, QC, Canada). From this construct, a RlucII-tagged version of Rap1GAP (1-442) with a linker sequence (GSAGTGGRAIDIKLPAT) between Rap1GAP and RlucII was created by Gibson assembly in pCDNA3.1_Hygro (+) GFP10-RlucII, replacing GFP10. Three substitutions (i.e. S437A/S439A/S441A) were introduced into the Rap1GAP sequence by PCR-mediated mutagenesis. These putative (S437 and S439) and documented (S441) (McAvoy et al., 2009 (
link)) protein kinase A phosphorylation sites were removed in order to eliminate any G
s-mediated Rap1GAP recruitment to the plasma-membrane.
To selectively detect G
q/11 activation, a construct encoding the G
q binding domain of the human p63 Rho guanine nucleotide exchange factor (p63RhoGEF; residues: 295–502) tagged with RlucII was done from IMAGE clones (OpenBiosystems; Burlington, ON, Canada) and subcloned by Gibson assembly in pCDNA3.1_Hygro (+) GFP10-RlucII, replacing GFP10. The G
q binding domain of p63RhoGEF and RlucII were separated by the peptidic linker ASGSAGTGGRAIDIKLPAT. N-term part containing palmitoylation sites maintaining p63 to plasma membrane and part of its DH domain involved in RhoA binding/activation (Aittaleb et al., 2010 (
link); Aittaleb et al., 2011 (
link)) are absent of the sensor.
To selectively detect G
12/13 activation, a construct encoding the G
12/13 binding domain of the human PDZ-RhoGEF (residues: 281–483) tagged with RlucII was done by PCR amplification from IMAGE clones (OpenBiosystems) and subcloned by Gibson assembly in pCDNA3.1_Hygro (+) GFP10-RlucII, replacing GFP10. The peptidic linker GIRLREALKLPAT is present between RlucII and the G
12/13 binding domain of PDZ-RhoGEF. The sensor is lacking the PDZ domain of PDZ-RhoGEF involved in protein-protein interaction, as well as actin-binding domain and DH/PH domains involved in GEF activity and RhoA activation (Aittaleb et al., 2010 (
link)).
The sequence of each EMTA biosensors is provided in the
Supplementary file 5.
Avet C., Mancini A., Breton B., Le Gouill C., Hauser A.S., Normand C., Kobayashi H., Gross F., Hogue M., Lukasheva V., St-Onge S., Carrier M., Héroux M., Morissette S., Fauman E.B., Fortin J.P., Schann S., Leroy X., Gloriam D.E, & Bouvier M. (2022). Effector membrane translocation biosensors reveal G protein and βarrestin coupling profiles of 100 therapeutically relevant GPCRs. eLife, 11, e74101.