Cited by 244Monoclonal and Polyclonal Antibodies ResearchChemical Synthesis and Analysisvaccines and immunoinformatics approaches

The Intrinsic Contributions of Tyrosine, Serine, Glycine and Arginine to the Affinity and Specificity of Antibodies

Birtalan, Sara, Zhang, Yingnan, Fellouse, Frederic A., Shao, Lihua, Schaefer, Gabriele, Sidhu, Sachdev S.·2008·Journal of Molecular Biology

Abstract

Synthetic antibody libraries with restricted chemical diversity were used to explore the intrinsic contributions of four amino acids (Tyr, Ser, Gly and Arg) to the affinity and specificity of antigen recognition. There was no correlation between nonspecific binding and the content of Tyr, Ser or Gly in the antigen-binding site, and in fact, the most specific antibodies were those with the highest Tyr content. In contrast, Arg content was clearly correlated with increased nonspecific binding. We combined Tyr, Ser and Gly to generate highly specific synthetic antibodies with affinities in the subnanomolar range, showing that the high abundance of Tyr, Ser and Gly in natural antibody germ line sequences reflects the intrinsic capacity of these residues to work together to mediate antigen recognition. Despite being a major functional contributor to co-evolved protein-protein interfaces, we find that Arg does not contribute generally to the affinity of naïve antigen-binding sites and is detrimental to specificity. Again, this is consistent with studies of natural antibodies, which have shown that nonspecific, self-reactive antibodies are rich in Arg and other positively charged residues. Our findings suggest that the principles governing naïve molecular recognition differ from those governing co-evolved interactions. Analogous studies can be designed to explore the roles of the other amino acids in molecular recognition. Results of such studies should illuminate the basic principles underlying natural protein-protein interactions and should aid the design of synthetic binding proteins with functions beyond the scope of natural proteins.

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Crossref · 10.1016/j.jmb.2008.01.093

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  • The prevalence of tyrosine among affinity-enhancing substitutions is consistent with the relatively high frequency of tyrosine in natural protein interfaces.

    “Many of these affinity-enhancing substitutions were mutations to tyrosine (Extended Data Fig. 6b), which is consistent with the relatively high frequency of tyrosine in natural protein interfaces27.”

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Authors
Birtalan, S., Zhang, Y., Fellouse, F. A., Shao, L., Schaefer, G., & Sidhu, S. S.
Affiliations
Genentech (US)
Corresponding author
Sidhu, Sachdev S.
Venue
Journal of Molecular Biology
Publisher
Elsevier BV
Published
2008-04
Volume
377
Issue
5
Pages
1518-1528
ISSN
0022-2836 (ISSN-L)
OpenAlex
W1978090240
Cited by
244
References
44
Citations by year
2026: 10 · 2025: 22 · 2024: 17 · 2023: 20 · 2022: 17 · 2021: 14 · 2020: 11 · 2019: 11 · 2018: 9 · 2017: 17 · 2016: 11 · 2015: 8 · 2014: 13 · 2013: 13 · 2012: 11
FWCI
10.27
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Molecular Biology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Monoclonal and Polyclonal Antibodies Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Chemical Synthesis and Analysis
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › vaccines and immunoinformatics approaches
Keywords
antibody affinity, antibody specificity, tyrosine, serine, glycine, L-arginine, synthetic antibody libraries, antigen recognition, non-specific binding, self-reactive antibodies, protein-protein interaction, amino acid composition
MeSH terms
Amino Acid Sequence, Antibodies, Antibody Affinity, Antibody Specificity, Arginine, Binding Sites, Antibody, Enzyme-Linked Immunosorbent Assay, Flow Cytometry, Glycine, Models, Molecular, Protein Binding, Serine, Tyrosine, Peptide Library

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