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Structural differences between the ectodomains of murine and human CD98hc
Author(s) -
Deuschle FriedrichChristian,
Schiefner André,
Skerra Arne
Publication year - 2019
Publication title -
proteins: structure, function, and bioinformatics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.699
H-Index - 191
eISSN - 1097-0134
pISSN - 0887-3585
DOI - 10.1002/prot.25686
Subject(s) - glycosylation , epitope , antibody , microbiology and biotechnology , peptide sequence , extracellular , transcytosis , computational biology , cell , biology , biochemistry , immunology , gene , endocytosis
The CD98 heavy chain (CD98hc) constitutes both a promising cell surface target for the treatment of cancers and a transcytosis receptor potentially useful for the brain delivery of therapeutics. However, pharmacokinetic studies and safety assessment of cognate antibodies or nonimmunoglobulin binding proteins in rodents is hampered by cross‐species variability of both amino acid sequence and glycosylation pattern. Here, we report the crystal structure of the murine CD98hc extracellular domain and a comprehensive comparison with its human ortholog, revealing only one conserved surface patch that is neither shielded by glycosylation nor by the cell membrane with an accessible surface area typical for an antibody epitope. Our results imply the necessity of a surrogate approach for CD98hc‐specific binding proteins with predictive power for clinical investigations.