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Effective combinatorial strategy to increase affinity of carbohydrate binding by peptides

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Abstract

The Thomsen-Friedenreich antigen, a carcinoma-associated disaccharide involved in carcinoma cell homotypic aggregation and increased metastatic potential, has clinical value as a prognostic indicator and a marker of metastasized cells. Hence, it can reasonably be predicted that antigen-binding macromolecules are valuable clinical invivo diagnostic/therapeutic targeting agents. Recently, we have selected first-generation antigen-binding peptides from a random peptide bacteriophage display library and have applied combinatorial affinity maturation to select functionally-maturated peptides, which target cultured carcinoma cells and inhibit carcinoma cell aggregation. In the current study we hypothesize that a targeted search of sequence space surrounding the antigen-binding consensus sequence will select unpredictable amino acid sequences in the non-consensus portions of the peptides, leading to increased affinity for the carbohydrate and greater solubility in physiological buffers. This comprehensive in vitro analysis demonstrates that preferential evolution of the amino-terminal sequence of the peptides occurred, which correlated, in structure/function studies, with the acquisition of maturated function. The maturated peptides are more soluble than the earlier peptides. Studies of peptide binding to the disaccharide indicate that two maturated peptides (P-30-1, F03) have higher affinity for the antigen and bind with higher intensity to the surface of cultured human carcinoma cells than the first-generation peptides. The results support our hypothesis that affinity maturation can improve carbohydrate binding by peptides and have theoretical importance as the first report of maturation of carbohydrate-binding affinity in a small, soluble peptide.

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Authors and Affiliations

  1. Department of Biochemistry, University of Missouri, M743 Medical Sciences Bldg., Columbia, MO, U.S.A

    Linda A. Landon, Jun Zou & Susan L. Deutscher

  2. Harry S. Truman Memorial Veterans Administration Hospital, Research Service, 800 Hospital Dr., Columbia, MO, U.S.A. (Author for correspondence, E-mail

    Susan L. Deutscher

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  1. Linda A. Landon
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Landon, L.A., Zou, J. & Deutscher, S.L. Effective combinatorial strategy to increase affinity of carbohydrate binding by peptides. Mol Divers 8, 35–50 (2004). https://doi.org/10.1023/B:MODI.0000006897.40575.41

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