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Biosynthesis and processing of a human T lymphocyte antigen
Journal of Immunology (Baltimore, Md. : 1950)
|March 1, 1982
Summary
This study details the creation of the Leu-1 T lymphocyte antigen, a cell surface glycoprotein. It explains how sugars are added and modified, with the final protein appearing on the cell surface within 30 minutes.
Area of Science:
- Immunology
- Cell Biology
- Biochemistry
Background:
- The Leu-1 antigen is a key marker on human T lymphocytes.
- Understanding its synthesis provides insights into T cell function and immune responses.
Purpose of the Study:
- To elucidate the biosynthesis and post-translational modifications of the Leu-1 antigen.
- To characterize the glycosylation pathway and cell surface expression dynamics of Leu-1.
Main Methods:
- Utilized monoclonal antibodies for Leu-1 detection.
- Employed pulse-labeling techniques to track protein synthesis.
- Investigated glycosylation using tunicamycin and Endo-H enzyme digestion.
Main Results:
- Identified the protein backbone molecular weight as 58,000 m.w. and the mature glycoprotein as 67,000 m.w.
- Demonstrated high-mannose sugar addition to asparagine residues during synthesis.
- Showed conversion to complex carbohydrates, including fucose, within 20 minutes.
- Observed cell surface appearance of the fully processed glycoprotein within 30 minutes.
Conclusions:
- The Leu-1 glycoprotein undergoes rapid and sequential glycosylation and processing.
- Its maturation pathway is comparable to other cell surface glycoproteins like HLA.
- These findings contribute to the understanding of T lymphocyte antigen biogenesis and cell surface dynamics.