For SDS-PAGE gel electrophoresis followed by total protein staining, IP samples were loaded on 4-12% Bis-Tris gels (NuPAGE #
NP0322BOX) and separated using
MOPS buffer (Novex #NP0001). Gels were stained with
Imperial Protein Stain (Thermofisher Scientific #24615) per manufacturer's instructions and images were captured using Epson
Perfection V800 Photo Color Scanner. Images were processed by ImageJ software. For western blots, IP samples were loaded (20% of an IP sample/well) and separated on 10% SDS-PAGE gels. The protein was transferred onto a nitrocellulose membrane, and the blot was blocked and incubated with a primary anti-GOA-1 antibody (1:1000 diluted affinity-purified rabbit anti-GOA-1 polyclonal antibody (Patikoglou and Koelle 2002) at 4°C
for overnight), washed, incubated with a secondary antibody (1:3000 HRP-linked
Anti-Rabbit antibody Bio-Rad) and protein bands were visualized with
SuperSignal West Pico PLUS Chemiluminescent Substrate (Thermofisher Scientific #34580) using a BioRad
ChemiDoc MP system. Blots were reprobed for Gb by stripping and then incubating overnight with 1:200 diluted mouse monoclonal anti-Gb antibody (Santa Cruz #sc-166123) followed by a secondary incubation with 1:1000 diluted
m-IgGk BP-HRP (Santa Cruz #sc-516102), and bands were again visualized by chemiluminescence.
Kumar S., Olson A., & Koelle M.R. (2021). The neural G protein Gαotagged with GFP at an internal loop is functional inC. elegans.