Volume 62, Issue 11 pp. 2349-2362
IMMUNOHEMATOLOGY

Relationship between B-cell epitope structural properties and the immunogenicity of blood group antigens: Outlier properties of the Kell K1 antigen

John G. Howe

John G. Howe

Department of Laboratory Medicine, Yale University School of Medicine, New Haven, Connecticut, USA

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Gary Stack

Corresponding Author

Gary Stack

Department of Laboratory Medicine, Yale University School of Medicine, New Haven, Connecticut, USA

Pathology and Laboratory Medicine Service, VA Connecticut Healthcare System, West Haven, Connecticut, USA

Correspondence

Gary Stack, Department of Laboratory Medicine, Yale University School of Medicine, New Haven, CT, USA.

Email: [email protected], [email protected]

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First published: 07 October 2022
Citations: 3

The views expressed in this article are those of the authors and do not necessarily reflect the position or policy of the Department of Veterans Affairs or the United States government.

Abstract

Background

The immunogenicities of polypeptide blood group antigens vary, despite most being created by single amino acid (AA) substitutions. To study the basis of these differences, we employed an immunoinformatics approach to determine whether AA substitution sites of blood group antigens have structural features typical of B-cell epitopes and whether the extent of B-cell epitope properties is positively related to immunogenicity.

Study design and methods

Fifteen structural property prediction programs were used to determine the likelihood of β-turns, surface accessibility, flexibility, hydrophilicity, particular AA composition and AA pairs, and other B-cell epitope properties at AA substitution sites of polypeptide blood group antigens.

Results

AA substitution sites of Lua, Jka, E, c, M, Fya, C, and S were each located in regions with at least two structural features typical of B-cell epitopes. The substitution site of K, the most immunogenic non-ABO/D antigen, scored the lowest for most B-cell epitope properties and was the only one not predicted to be part of a linear B-cell epitope. The most immunogenic antigens studied (K, Jka, Lua, E) had B-cell epitope structural properties determined by the fewest programs; the least immunogenic antigens (e.g., Fya, S, C, c) had B-cell epitope properties according to the most programs.

Discussion

Counter to prediction, the immunogenicity of polypeptide blood group antigens was not positively related to B-cell epitope structural features present at their AA-substitution sites. Instead, it tended to be negatively related. The AA-substitution site of the most immunogenic non-ABO/D antigen, K, had the least B-cell epitope features.

CONFLICT OF INTEREST

The authors declare that they have no conflict of interest relevant to the manuscript submitted to TRANSFUSION.

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