Issue 11, 2022

A homogeneous high-DAR antibody–drug conjugate platform combining THIOMAB antibodies and XTEN polypeptides

Abstract

The antibody–drug conjugate (ADC) is a well-validated modality for the cell-specific delivery of small molecules with impact expanding rapidly beyond their originally-intended purpose of treating cancer. However, antibody-mediated delivery (AMD) remains inefficient, limiting its applicability to targeting highly potent payloads to cells with high antigen expression. Maximizing the number of payloads delivered per antibody is one key way in which delivery efficiency can be improved, although this has been challenging to carry out; with few exceptions, increasing the drug-to-antibody ratio (DAR) above ∼4 typically destroys the biophysical properties and in vivo efficacy for ADCs. Herein, we describe the development of a novel bioconjugation platform combining cysteine-engineered (THIOMAB) antibodies and recombinant XTEN polypeptides for the unprecedented generation of homogeneous, stable “TXCs” with DAR of up to 18. Across three different bioactive payloads, we demonstrated improved AMD to tumors and Staphylococcus aureus bacteria for high-DAR TXCs relative to conventional low-DAR ADCs.

Graphical abstract: A homogeneous high-DAR antibody–drug conjugate platform combining THIOMAB antibodies and XTEN polypeptides

Supplementary files

Article information

Article type
Edge Article
Submitted
22 sep. 2021
Accepted
27 jan. 2022
First published
28 jan. 2022
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY-NC license

Chem. Sci., 2022,13, 3147-3160

A homogeneous high-DAR antibody–drug conjugate platform combining THIOMAB antibodies and XTEN polypeptides

N. Zacharias, V. N. Podust, K. K. Kajihara, D. Leipold, G. Del Rosario, D. Thayer, E. Dong, M. Paluch, D. Fischer, K. Zheng, C. Lei, J. He, C. Ng, D. Su, L. Liu, S. Masih, W. Sawyer, J. Tinianow, J. Marik, V. Yip, G. Li, J. Chuh, J. H. Morisaki, S. Park, B. Zheng, H. Hernandez-Barry, K. M. Loyet, M. Xu, K. R. Kozak, G. L. Phillips, B. Shen, C. Wu, K. Xu, S. Yu, A. Kamath, R. K. Rowntree, D. Reilly, T. Pillow, A. Polson, V. Schellenberger, W. L. W. Hazenbos and J. Sadowsky, Chem. Sci., 2022, 13, 3147 DOI: 10.1039/D1SC05243H

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