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Modulating tyrosine sulfation of recombinant antibodies in CHO cell culture by host selection and sodium chlorate supplementation
Author(s) -
Liu Ren,
Zhang Yixiao,
Kumar Amit,
Huhn Steven,
Hullinger Laurie,
Du Zhimei
Publication year - 2021
Publication title -
biotechnology journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.144
H-Index - 84
eISSN - 1860-7314
pISSN - 1860-6768
DOI - 10.1002/biot.202100142
Subject(s) - sulfation , chinese hamster ovary cell , tyrosine , sodium chlorate , biochemistry , chemistry , receptor tyrosine kinase , cell culture , sulfotransferase , biology , receptor , inorganic chemistry , genetics
Background Tyrosine sulfation is a post‐translational modification found on many surface receptors and plays an important role in cell‐cell and cell‐matrix interactions. However, tyrosine sulfation of therapeutic antibodies has only been reported very recently. Because of potential potency and immunogenicity concerns, tyrosine sulfation needs to be controlled during the manufacturing process. Methods and results In this study, we explored methods to modulate antibody tyrosine sulfation during cell line development and upstream production process. We found that tyrosine sulfation levels were significantly different in various Chinese hamster ovary (CHO) cell lines due to differential expression of genes in the sulfation pathway including tyrosylprotein sulfotransferase 2 (TPST2) and the sulfation substrate transporter SLC35B2. We also screened chemical inhibitors to reduce tyrosine sulfation in CHO culture and found that sodium chlorate could significantly inhibit tyrosine sulfation while having minimal impact on cell growth and antibody production. We further confirmed this finding in a standard fed‐batch production assay. Sodium chlorate at 16 mM markedly inhibited tyrosine sulfation by more than 50% and had no significant impact on antibody titer or quality. Conclusion These data suggest that we can control tyrosine sulfation by selecting CHO cell lines based on the expression level of TPST2 and SLC35B2 or adding sodium chlorate in upstream production process.