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Boué, D.R. et al.

Structural characterization of the human B lymphocyte-restricted differentiation antigen CD22. Comparison with CD21 (complement receptor type 2/Epstein-Barr virus receptor).

CD22 and CD21 are glycoproteins primarily expressed on normal and neoplastic human B cells. The surface expression of these two molecules parallel each other during normal B cell differentiation, and the reported relative mobilities for CD22 and CD21 are 130/140 kDa and 140 kDa, respectively. Herein we present a detailed analysis of the biosynthesis and structure of CD22 and also compare it directly to CD21. Electrophoresis under reducing and nonreducing conditions suggested that CD22 and CD21 may have similarities in intra-chain disulfide bond formation. Biosynthesis and processing of CD22 and CD21 were very similar with respect to kinetics and post-translational modification, and both could be phosphorylated. However, endoglycosidase digestion (using N-glycanase and endoglycosidase H) and peptide mapping (using V8 protease and N-chlorosuccinimide) strongly suggested that CD22 and CD21 are distinct gene products.[1]

References

Structural characterization of the human B lymphocyte-restricted differentiation antigen CD22. Comparison with CD21 (complement receptor type 2/Epstein-Barr virus receptor). Boué, D.R., Lebien, T.W. J. Immunol. (1988) [Pubmed]

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