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What are the differences between lysosomes and proteasomes?
Posted September 7, 2023
Cellular Structures and OrganellesEnzymesLysosomesProteasesProtein
Answer

Basis of differentiation 

Lysosomes

Proteasomes

Definition
A lysosome is a membrane-bound organelle that contains digestive enzymes
Proteasomes are protein complexes which degrade unneeded or damaged proteins by proteolysis
Substrate degradation
Lysosomes degrade cytoplasmic components, including individual proteins, defective or surplus organelles through autophagy, or protein aggregates
Proteasomes degrade individual cellular proteins in a highly targeted manner through the ubiquitin-proteasome system
Structure
They are spherical vesicles with a single lipid bilayer membrane
They are cylindrical structures with a central core and regulatory particles at each end
Mechanism 
Lysosomes use hydrolytic enzymes to break down substrates 
Proteasomes degrade proteins by unfolding them and threading them into the central core
Regulation
Lysosome activity is regulated by the pH of their environment, and have an acidic interior (pH between 4.0-5.0) which amplifies activity of hydrolytic enzymes
Proteasome activity is dependent on ubiquitin ligases 
Additional resources
Proteasomal and Lysosomal Protein Degradation and Heart DiseaseLysosomesCell Navigator® Lysosome Staining Kit *Red Fluorescence*

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