VirS, an OmpR PhoB subfamily response regulator, is required for activation of vapA gene expression in Rhodococcus equi BMC Microbiology Springer Nature Link Systemwide effects of ER intracellular membrane contact site disturbance in primary endothelial cells ScienceDirect VAPB is a negative regulator of STING mediated innate immune signaling Science Advances Frontiers VAP Proteins From Organelle Tethers to Pathogenic Host Interactors and Their Role in Neuronal Disease