Tag: Protein degradation

Proteolytic cleavage is the enzymatic breakdown of protein peptide bonds by proteases. Explore proteolysis, protease classes, cleavage specificity, zymogen activation, protein degradation, detection, mass spectrometry, and applications.

Post-translational modifications are essential regulators of cell-cycle progression. Learn how phosphorylation, ubiquitination, acetylation, SUMOylation, methylation, and other PTMs control CDKs, cyclins, checkpoints, DNA replication, mitosis, and protein degradation.

Protein neddylation is an important post-translational modification involving the attachment of NEDD8 to target proteins. Learn how neddylation regulates cullin-RING ubiquitin ligases, protein degradation, cell-cycle progression, DNA repair, cellular signaling, and cancer biology.

Protein pupylation is a bacterial post-translational modification system that regulates protein degradation and cellular protein homeostasis. Explore its components, mechanism, biological functions, and importance in Mycobacterium tuberculosis.

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

Protein deamidation is a chemical modification in which asparagine or glutamine residues are converted into acidic amino acids. Learn how deamidation affects protein structure, stability, aging, proteostasis, disease, and therapeutic proteins.

Protein misfolding occurs when proteins fail to achieve or maintain their correct three-dimensional structures. Explore its causes, cellular consequences, quality-control mechanisms, and connection to disease.

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.

Single‑chain RING finger ubiquitin ligases form an important subgroup of E3 enzymes within the ubiquitin–proteasome system. Unlike multi‑subunit Cullin–RING ligases,…

Timely protein degradation is essential for orderly cell-cycle progression. Explore key cell-cycle regulators, their degradation mechanisms, and how their turnover controls G1/S transition, mitosis, chromosome segregation and mitotic exit.

Autophagosomes are double‑membrane vesicles that capture cytoplasmic material for lysosomal degradation. Formed from expanding phagophores and marked by LC3 lipidation, autophagosomes are central to autophagy, enabling cells to recycle nutrients, remove damaged organelles and maintain homeostasis. Their dysfunction contributes to neurodegenerative, metabolic and cancerous diseases.

Cdc20 is a key activator of the APC/C complex, initiating the metaphase‑to‑anaphase transition by promoting securin and Cyclin B degradation. Regulated by checkpoint proteins such as Mad2 and BubR1, Cdc20 safeguards chromosome segregation, while its dysregulation contributes to aneuploidy and cancer progression.

The ubiquitin-proteasome system is the master regulator of the cell cycle, controlling cyclin degradation, checkpoint progression, and mitotic exit. This comprehensive guide covers UPS mechanisms in G1/S transition, S phase, mitosis, and cancer therapy.

The autophagy-lysosome pathway is the cell’s primary degradation and recycling system, responsible for clearing damaged proteins, dysfunctional organelles, and intracellular pathogens. Dysfunction in this pathway has been linked to neurodegenerative disorders, cancer, and metabolic syndromes. This article explores how the process works, its role in disease prevention, and emerging therapeutic strategies targeting this vital cellular mechanism.