Comparison between primary lysosomes and secondary lysosomes

By: Prof. Dr. Fazal Rehman | Last updated: February 3, 2024

Let me share with you a comparison between primary lysosomes and secondary lysosomes.

Aspect Primary Lysosomes Secondary Lysosomes
Formation Formed by the Golgi apparatus Formed by the fusion of primary lysosomes with endocytic vesicles or other cellular components
Size Relatively smaller as compared to secondary lysosomes Larger and more mature compared to primary lysosomes
Enzymatic Activity Enzymes are present but not yet activated Enzymes are activated and functional for degradation
Content Contains hydrolytic enzymes (hydrolases) in an inactive state Contains activated hydrolytic enzymes for breaking down macromolecules
Function Primarily involved in the synthesis and packaging of hydrolytic enzymes Responsible for the degradation of cellular material, including macromolecules and cellular organelles
pH Level Less acidic as compared to secondary lysosomes Maintains an acidic pH for optimal enzymatic activity
Role in Degradation Does not participate directly in cellular degradation until fused with other vesicles Actively involved in the breakdown of materials
Status in Healthy Cells Present in a quiescent state until needed Actively involved in ongoing cellular degradation processes
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