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Related Experiment Videos

The B cell antigen CD75 is a cell surface sialytransferase.

I Stamenkovic1, H C Asheim, A Deggerdal

  • 1Department of Pathology, Harvard Medical School, Massachusetts General Hospital, Boston 02114.

The Journal of Experimental Medicine
|August 1, 1990
PubMed
Summary

Researchers isolated a CD75 antigen clone, revealing it is identical to alpha-2,6 sialyltransferase. This finding demonstrates cell surface expression of sialyltransferase, crucial for B cell functions like adhesion and antigen presentation.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Biochemistry

Background:

  • The B cell antigen CD75 plays a role in immune cell interactions.
  • Alpha-2,6 sialyltransferase is typically localized within the Golgi complex.
  • The precise function and localization of CD75 in B cells require further elucidation.

Purpose of the Study:

  • To isolate and characterize the cDNA clone encoding the B cell antigen CD75.
  • To determine the amino acid sequence of CD75 and compare it to known proteins.
  • To investigate the cell surface expression of sialyltransferase in B cells.

Main Methods:

  • cDNA cloning techniques were employed to isolate the gene encoding CD75.
  • Amino acid sequencing was performed to identify the protein structure.

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  • Cellular expression analysis was conducted to confirm surface localization.

    • Main Results:

    • A cDNA clone encoding the B cell antigen CD75 was successfully isolated.
    • The amino acid sequence of CD75 was found to be identical to human alpha-2,6 sialyltransferase.
    • This study provides the first evidence of sialyltransferase expression on the B cell surface.

    Conclusions:

    • CD75 is the cell surface form of alpha-2,6 sialyltransferase in B cells.
    • Cell surface alpha-2,6 sialyltransferase may be involved in B cell intercellular adhesion.
    • This enzyme could also play a role in B cell antigen presentation events.