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Updated: Aug 12, 2026

Assaying Proteasomal Degradation in a Cell-free System in Plants
Published on: March 26, 2014
The COP9 signalosome: regulating plant development through the control of proteolysis
Giovanna Serino1, Xing-Wang Deng
1Dipartimento di Genetica e Biologia Molecolare, Universitá di Roma La Sapienza, 00185 Roma, Italy. giovanna.serino@uniroma1.it
Abstract:
The COP9 signalosome (CSN) is a multiprotein complex that was initially identified in plants as a repressor of photomorphogenesis. It is now known to play major roles in several other developmental pathways, from auxin response to flower development. Furthermore, the COP9 signalosome shares homologies with the lid sibcomplex of the proteasome and is evolutionarily conserved from fission yeast to humans. It is important for the proper development of virtually all higher eukaryotes. In recent years, significant progress has been made in unraveling the molecular, cellular, and physiological mode of action of the COP9 signalosome. This review discusses our current understanding of the COP9 signalosome function with particular emphasis on its recently defined role in modulating a wide variety of cellular processes by regulating specific protein degradation events.
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