PPP1CB and viral infectious disease: In the case of the plant DNA virus cauliflower mosaic virus (CaMV), it has been reported that its movement protein (MP) contains three YXXΦ motifs that interact with AP2μ, and at least one of these motifs is essential for the localization of MP to endosomes, for tubule assembly, and for viral infection (Carluccio et al., 2014).