Specific proteins coimmunoprecipitate with intracellular Aβ. Lysates
of adult wild-type, CL2006 (Aβ-expressing), or CL2179
(GFP-expressing) animals were incubated with mAb 4G8 or control
anti-GFP mAb, and the resulting immunoprecipitates were fractionated on
SDS 4–20% polyacrylamide gels and visualized by silver staining. Lane
1, wild-type animals immunoprecipitated with 4G8; lane 2, CL2006
animals immunoprecipitated with 4G8; lane 3, CL2006 animals
immunoprecipitated with anti-GFP; lane 4, CL2006 animals
immunoprecipitated with 4G8; lane 5, heat-shocked CL2179 animals
immunoprecipitated with anti-GFP; lane 6, untreated CL2179 animals
immunoprecipitated with anti-GFP. Specific bands reproducibly
identified in all CL2006 immunoprecipitation performed to date (nine
independent immunoprecipitations) are indicated with asterisks (lanes 2
and 4). All visible bands in lane 2 were subjected to mass spectrometry
analysis. The boxes in lane 2 indicate faint bands also recovered for
MS analysis. The heavy GFP band in lanes 5 and 6 was confirmed by
immunoblot (data not shown). IgG HC, Ig heavy chains; IgG LC, Ig light
chains.