1. Computer‐based engineering of thermostabilized antibody fragments
- Author
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Sang Taek Jung, George Georgiou, Chang-Han Lee, Gregory C. Ippolito, Wenzong Li, Jiwon Lee, R. E. Hughes, Oana I. Lungu, Brian Kuhlman, Bryan S. Der, Jeffrey J. Gray, Jianqing Xu, Tae Hyun Kang, Yan Zhang, Nicholas M. Marshall, Bing Tan, Christos S. Karamitros, Andrew D. Ellington, and Aleksandr E. Miklos
- Subjects
chemistry.chemical_classification ,Environmental Engineering ,Molecular model ,biology ,General Chemical Engineering ,Melting temperature ,Computer based ,Biomolecular engineering ,02 engineering and technology ,021001 nanoscience & nanotechnology ,medicine.disease_cause ,Article ,Antibody fragments ,Amino acid ,020401 chemical engineering ,chemistry ,Biochemistry ,medicine ,biology.protein ,Clostridium botulinum ,0204 chemical engineering ,Antibody ,0210 nano-technology ,Biotechnology - Abstract
We used the molecular modeling program Rosetta to identify clusters of amino acid substitutions in antibody fragments (scFvs and scAbs) that improve global protein stability and resistance to thermal deactivation. Using this methodology, we increased the melting temperature (T(m)) and resistance to heat treatment of an antibody fragment that binds to the Clostridium botulinum hemagglutinin protein (anti-HA33). Two designed antibody fragment variants with two amino acid replacement clusters, designed to stabilize local regions, were shown to have both higher T(m) compared to the parental scFv and importantly, to retain full antigen binding activity after 2 hours of incubation at 70 °C. The crystal structure of one thermostabilized scFv variants was solved at 1.6 Å and shown to be in close agreement with the RosettaAntibody model prediction.
- Published
- 2019
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