Updated project metadata. We previously identified the stimuli-responsive lncRNA CALA to impact endothelial cell function and identified G3BP1 as a main interaction partner of CALA in the cytoplasm of human umblical vein endothelial cells (HUVECs). To uncover the role of the lncRNA CALA in G3BP1-RNPs in the cytoplasm, we purified the G3BP1 interactome in control and CALA-silenced HUVECs via anti-G3BP1 immunoprecipitation followed by mass spectrometry. We thereby uncover the basal G3BP1 protein interactome in HUVECs and additionally identify lncRNA-dependent protein interactions of G3BP1 in the cytoplasm of HUVEC.