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Effects of amino acid substitutions outside an antigenic site on protein binding to monoclonal antibodies of predetermined specificity obtained by peptide immunization: Demonstration with region 15–22 (antigenic site 1) of myoglobin

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Abstract

Monoclonal antibodies (mAbs) of predetermined specificity were prepared by immunizing with a free (i.e., not conjugated to any carrier) synthetic peptide representing region 15–22 (site 1) of sperm whale myoglobin (SpMb). The cross-reactions of Mb variants with three mAbs were studied in order to determine whether such interactions are influenced by substitutions outsde the site. Finback whale Mb, which has no substitutions within region 15–22, showed lower cross-reactivity and relative binding affinity than the reference antigen, SpMb. Bottle-nose Atlantic dolphin myoglobin (BdMb) and badger myoglobin (BgMb), although they have identical substitutions within region 15–22 (Ala-15 to Gly and Val-21 to Leu), showed very different binding properties. The cross-reaction of BdMb was quite comparable to that of SpMb, while that of BgMb was much lower. Since the two proteins have identical structures in regions 15–22, the differences in their cross-reactivities are readily attributed to the effects of substitutions outside this region. Another pair of myoglobins, horse myoglobins (HsMb) and chicken myoglobin (ChMb), also have two identical substitutions (Ala-15 to Gly and Val-21 to Ile) within region 15–22, but possessed different cross-reactivity. The results indicate that the reaction of mAbs, whose specificity is precisely known and predetermined by the immunizing free peptide, can be markedly affected by substitutions outside the indicated binding region on the protein.

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Authors and Affiliations

  1. Department of Biochemistry, Baylor College of Medicine, 77030, Houston, Texas

    Mohamed-Salah I. Abaza & M. Zouhair Atassi

  2. Department of Veterinary Pathobiology, The Texas Veterinary Medical Center, Texas A&M University, 77843, College Station, Texas

    Colin R. Young

Authors
  1. Mohamed-Salah I. Abaza
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  2. Colin R. Young
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  3. M. Zouhair Atassi
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Abaza, MS.I., Young, C.R. & Atassi, M.Z. Effects of amino acid substitutions outside an antigenic site on protein binding to monoclonal antibodies of predetermined specificity obtained by peptide immunization: Demonstration with region 15–22 (antigenic site 1) of myoglobin. J Protein Chem 11, 445–454 (1992). https://doi.org/10.1007/BF01025021

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