Diverse proteolytic pathways regulate chloroplasts. Recent work has revealed significant new roles for chloroplast ubiquitination in stress adaptation, involving targeted protein removal through the ubiquitin-proteasome system, or selective, whole-chloroplast degradation.
Ling, Q., & Jarvis, P. (2016, January 11). Plant Signaling: Ubiquitin Pulls the Trigger on Chloroplast Degradation. Current Biology. Cell Press. https://doi.org/10.1016/j.cub.2015.11.022