Figure 1. Intracellular proteolytic systems cross-talk.
Recent studies support many levels of functional interaction and cross-talk among the main proteolytic systems in the cell: the ubiquitin proteasome system (UPS) and the different autophagic pathways (macroautophagy, microautophagy and chaperone-mediated autophagy (CMA)). Some of the already identified levels of cross-talk are highlighted and discussed in the text.