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Endosomal proteolysis and MHC class II function

¹Department of Medicine, Brigham and Women's Hospital, Boston, MA, USA. hchapman@rics.bwh.harvard.edu

Current Opinion in Immunology

|April 2, 1998

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The invariant chain guides MHC class II assembly and trafficking. Cysteine proteases like cathepsins S and L are crucial for invariant chain degradation, enabling antigen loading onto MHC class II molecules.

Area of Science:

Immunology
Molecular Biology
Cell Biology

Background:

Newly synthesized MHC class II molecules require association with the invariant chain for proper folding, assembly, and intracellular trafficking.
The invariant chain prevents premature peptide binding to MHC class II molecules in the endoplasmic reticulum.

Purpose of the Study:

To elucidate the role of invariant chain processing in MHC class II peptide loading.
To investigate the function of specific cysteine proteases in regulating antigen presentation.

Main Methods:

Studies involving protein interactions and cellular trafficking pathways.
Analysis of proteolytic processing of the invariant chain.
Investigating the activity of cysteine proteases such as cathepsins S and L.

Related Experiment Videos

Main Results:

The invariant chain acts as a chaperone, facilitating MHC class II assembly and transport.
Concurrent proteolytic processing of the invariant chain and endocytosed antigens is essential for efficient MHC class II peptide loading.
Cathepsins S and L play critical roles in degrading the invariant chain.

Conclusions:

Specific cysteine proteases are key regulators of invariant chain degradation.
These proteases control the convergence of processed antigens and MHC class II dimers, enabling effective antigen presentation.