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Engineered Antibody and Monobody Domains with T Cell Receptor-Like Selectivity for Tumor Associated Peptide-MHC Antigens


Hamdouche, Samy (2014) Engineered Antibody and Monobody Domains with T Cell Receptor-Like Selectivity for Tumor Associated Peptide-MHC Antigens. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/Z9WH2N02.


Monoclonal antibody (mAb)-based therapeutics have established themselves as meaningful components of the treatment paradigm for a variety of tumors. However, since the approval of rituximab in 1997 as the first mAb-based therapy for cancer, there has been a paucity of novel, validated cancer targets for therapeutic intervention by mAbs. In effect, numerous challenges lie in the discovery of suitable extracellular or transmembrane antigens that permit the differentiation of tumor from healthy tissue. The adaptive immune system, though, mediates recognition of foreign antigens derived from the intracellular proteome by T cell receptor (TCR) binding to peptide-loaded major histocompatibility complex (pMHC) molecules. Because cancer is associated with large-scale alterations in the genome, there are a vast number of novel epitopes presented to the adaptive immune system. Although natural TCRs have exquisite functionality in distinguishing these foreign epitopes, and several tumor-reactive TCRs have, in fact, been characterized, the molecules themselves are poorly developable as therapeutic candidates. Thus, in order to enable TCR-like binding of a broader class of protein agents, this study explores the transfer of TCR binding domains to other mAb-based scaffolds, including the fibronectin-derived Fn3 and the IgG-derived 4D5 scaffolds. By using a combination of rational design and directed evolution to guide binding domain transfer, evidence for TCR-like binding was demonstrated for several engineered molecules. In addition to conferring binding functionality, the grafted TCR domains had a deleterious effect on the biophysical properties of these inherently robust protein scaffolds. Thus, this work provides novel insight into the objective of developing mAb-based agents with TCR-like binding specificity for pMHC antigens, informing future efforts to target the abundance of intracellular tumor epitopes.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:antibody, peptide-MHC, TCR
Degree Grantor:California Institute of Technology
Division:Biology and Biological Engineering
Major Option:Biochemistry and Molecular Biophysics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Mayo, Stephen L.
Thesis Committee:
  • Miller, Thomas F. (chair)
  • Baltimore, David L.
  • Pierce, Niles A.
  • Mayo, Stephen L.
Defense Date:29 May 2014
Record Number:CaltechTHESIS:06062014-175608943
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:8501
Deposited By: Samy Hamdouche
Deposited On:14 Nov 2016 23:17
Last Modified:04 Oct 2019 00:05

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