Tag: Ubiquitin-Proteasome system

COP1 and phytochrome signaling connect red and far-red light perception with protein degradation, PIF regulation, HY5 stability, and photomorphogenesis.

COP1 and HY5 form a central regulatory module in plant photomorphogenesis. Discover how COP1-dependent ubiquitination controls HY5 stability and light-responsive gene expression.

The COP1-SPA complex is a central regulator of plant photomorphogenesis, integrating light signals from phytochromes, cryptochromes and UVR8 with selective protein degradation.

COP1 substrate recognition is a key mechanism controlling selective protein degradation. Explore the COP1 WD40 domain, VP motifs, HY5, COP1-SPA complexes, ubiquitination, and proteasomal degradation.

COP1 is a conserved RING-type E3 ubiquitin ligase that controls protein stability through selective substrate recognition and ubiquitination. Learn how its RING, coiled-coil, and WD40 domains coordinate protein degradation and cellular signaling.

COP1 is a highly conserved E3 ubiquitin ligase found across diverse eukaryotic organisms. Its conserved domains support ubiquitination, substrate recognition, protein turnover, and regulation of developmental and cellular signaling pathways.

Kelch repeats are protein structural units that form beta-propeller domains. They help proteins recognize specific partners and play important roles in protein degradation, cellular stress responses, and cytoskeletal organization.

COP1 is a key negative regulator of photomorphogenesis in Arabidopsis. Discover how the COP1/SPA ubiquitin ligase controls light-responsive development by regulating the stability of important transcription factors such as HY5.

HY5 is a central transcription factor in Arabidopsis photomorphogenesis. Discover how COP1/SPA regulates HY5 stability and how HY5 controls light-responsive gene expression, plant development, and photosynthetic responses.

RING E3 ligase autoubiquitination provides an important mechanism for regulating E3 stability, activity, localization, and protein turnover through dynamic ubiquitin signaling.

Protein ubiquitination is a fundamental post-translational modification that regulates protein degradation, cellular signaling, DNA repair, autophagy, protein trafficking and cellular homeostasis.

Protein homeostasis is the process by which cells maintain a balance between protein synthesis and degradation. This balance is essential for protein quality, cellular function, growth, adaptation, and survival.

ERAD is a central ER quality‑control pathway that recognises misfolded proteins, retrotranslocates them to the cytosol, ubiquitinates them and directs them to the proteasome. By preventing proteotoxic accumulation, ERAD preserves ER homeostasis and supports cellular proteostasis.

The proteostasis network is an integrated system of chaperones, degradation pathways and organelle‑specific quality‑control mechanisms that maintains protein folding, stability and function. By coordinating refolding, repair and degradation, cells prevent proteotoxic stress and preserve homeostasis.

Protein quality control (PQC) is a cellular surveillance system that preserves proteome integrity by monitoring protein folding, repairing misfolded proteins and eliminating damaged or aggregated species. Through coordinated action of chaperones, the ubiquitin–proteasome system and autophagy, PQC protects cells from proteotoxic stress and maintains homeostasis.