Disulfide linkage engineering for improving biophysical properties of human VH domains

  1. Get@NRC: Disulfide linkage engineering for improving biophysical properties of human VH domains (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1093/protein/gzs055
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Journal titleProtein Engineering, Design and Selection
Pages581589; # of pages: 9
SubjectAffinity reagents; Biophysical properties; Conformational change; Disulfide linkages; Heavy chain; Heavy-chain antibodies; Human antibodies; Model domains; Multi-angle light scatterings; Therapeutic potentials; thermostability; Variable domain; Agglomeration; Amino acids; Antibodies; Libraries; Turbidity; Sulfur compounds; antibody; cysteine; disulfide; heavy chain antibody variable domain; protein A; unclassified drug; amino acid substitution; article; Artiodactyla; binding affinity; biophysics; circular dichroism; covalent bond; disulfide linkage; gel permeation chromatography; human; mass spectrometry; molecular cloning; priority journal; protein engineering; protein expression; thermostability; turbidity; Amino Acid Sequence; Amino Acid Substitution; Disulfides; Humans; Immunoglobulin Heavy Chains; Immunoglobulin Variable Region; Molecular Sequence Data; Protein Conformation; Protein Engineering; Protein Stability; Sequence Alignment; Temperature; Camelidae
AbstractTo enhance their therapeutic potential, human antibody heavy chain variable domains (VHs) would benefit from increased thermostability. The highly conserved disulfide linkage that connects Cys23 and Cys104 residues in the core of VH domains is crucial to their stability and function. It has previously been shown that the introduction of a second disulfide linkage can increase the thermostability of camelid heavy-chain antibody variable domains (VHHs). Using four model domains we demonstrate that this strategy is also applicable to human VH domains. The introduced disulfide linkage, formed between Cys54 and Cys78 residues, increased the thermostability of VHs by 1418°C. In addition, using a novel hexa-histidine capture technology, circular dichroism, turbidity, size exclusion chromatography and multiangle light scattering measurements, we demonstrate reduced VH aggregation in domains with the Cys54Cys78 disulfide linkage. However, we also found that the engineered disulfide linkage caused conformational changes, as indicated by reduced binding of the VHs to protein A. This indicates that it may be prudent to use the synthetic VH libraries harboring the engineered disulfide linkage before screening for affinity reagents. Such strategies may increase the number of thermostable binders. © 2012 The Author.
Publication date
AffiliationNational Research Council Canada (NRC-CNRC); Human Health Therapeutics (HHT-TSH)
Peer reviewedYes
NPARC number21269166
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Record identifier058a7ad7-aa5d-46f3-bb92-5b6891a2747d
Record created2013-12-12
Record modified2016-05-09
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