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Lysosomal Hydrolases

Lysosomal Hydrolases

Lysosomes are the site for the degradation of macromolecules and biological polymers released during membrane trafficking events such as secretory, endocytic, autophagic, and phagocytic pathways. The membrane-enclosed area of the lysosome, called the lumen, contains hydrolytic enzymes active in an acidic environment. These acid hydrolases are functional at a pH between 4.5 and 5 and are involved in cellular processes such as cell signaling, energy metabolism, restoration of the plasma membrane,...

Delivery Pathways to the Lysosome

Delivery Pathways to the Lysosome

Eukaryotic cells use different mechanisms to eliminate toxic waste obsolete and worn-out substances. Lysosomes play a pivotal role in this, and hence, these substances are carried to the lysosome from other parts of the cell and extracellular space through different pathways. The most elaborately studied pathways to the lysosome are the endocytic pathways.
Endocytosis
In endocytosis, the cell membrane takes up macromolecules and particles from the surrounding medium. Clathrin-mediated...

Lysosomes

Lysosomes

Lysosomes are membrane-enclosed spherical sacs derived from the Golgi apparatus. The most important function of the lysosome is degrading macromolecules and biological polymers that are released during membrane trafficking events such as the secretory, endocytic, autophagic, and phagocytic pathways. The degradation is carried out by several hydrolytic enzymes active in an acidic environment of the lysosomal lumen. These acid hydrolases are involved in cellular processes such as cell signaling,...

Lysosomes

Lysosomes

Lysosomes are membrane-enclosed spherical sacs derived from the Golgi apparatus. The most important function of the lysosome is degrading macromolecules and biological polymers that are released during membrane trafficking events such as the secretory, endocytic, autophagic, and phagocytic pathways. The degradation is carried out by several hydrolytic enzymes active in an acidic environment of the lysosomal lumen. These acid hydrolases are involved in cellular processes such as cell signaling,...

Export of Misfolded Proteins out of the ER

Export of Misfolded Proteins out of the ER

After folding, the ER assesses the quality of secretory and membrane proteins. The correctly folded proteins are cleared by the calnexin cycle for transport to their final destination, while misfolded proteins are held back in the ER lumen. The ER chaperones attempt to unfold and refold the misfolded proteins but sometimes fail to achieve the correct native conformation. Such terminally misfolded proteins are then exported to the cytosol by ER-associated degradation or ERAD pathway for...

Role of ER in the Secretory Pathway

Role of ER in the Secretory Pathway

Eukaryotic cells have a special pathway that enables communication between various intracellular membrane-bound compartments and also with the extracellular environment. This pathway is termed as the secretory pathway.
Components of the secretory pathway
About a third of proteins synthesized in the cell are sorted via the secretory route. They shuffle between different compartments in membrane-bound vesicles until they reach their final destination. The main intracellular compartments involved...

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Pulse-chase Analysis of N-linked Sugar Chains from Glycoproteins in Mammalian Cells

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Mannose-6-phosphate pathway: a review on its role in lysosomal function and dysfunction.

Maria Francisca Coutinho¹, Maria João Prata, Sandra Alves

¹Research and Development Unit, Department of Genetics, CGMJM, INSA Portugal. francisca_coutinho@yahoo.com

Molecular Genetics and Metabolism

|January 24, 2012

Summary

Lysosomal enzymes are tagged with mannose-6-phosphate (M6P) and recognized by M6P receptors for transport to lysosomes. This review details the M6P-dependent pathway and associated lysosomal storage disorders.

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Area of Science:

Cell Biology
Molecular Biology
Biochemistry

Background:

Lysosomal hydrolases require precise trafficking from the Golgi apparatus to lysosomes.
Accurate sorting relies on specific protein tagging and receptor-mediated transport.

Purpose of the Study:

To review the mannose-6-phosphate (M6P)-dependent pathway for lysosomal enzyme transport.
To elucidate the roles of key proteins and receptors in this pathway.
To discuss lysosomal storage disorders linked to M6P pathway defects.

Main Methods:

Literature review synthesizing current knowledge on M6P pathway components.
Analysis of protein interactions and cellular transport mechanisms.
Examination of genetic defects leading to lysosomal storage diseases.

Main Results:

Lysosomal enzymes are tagged with M6P in the cis-Golgi network.
M6P receptors in the trans-Golgi network mediate enzyme sorting into transport vesicles.
Defects in UDP-N-acetylglucosamine 1-phosphotransferase cause mucolipidosis types II and III.

Conclusions:

The M6P-dependent pathway is crucial for lysosomal enzyme delivery.
Understanding this pathway is key to comprehending lysosomal storage disorders.
Further research on M6P pathway proteins may reveal therapeutic targets.